Category: MCQ Questions

Check the below Online Education NCERT MCQ Questions for Class 8 Science Chapter 4 Materials: Metals and Non-Metals with Answers Pdf free download. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. We have provided Materials: Metals and Non-Metals Class 8 Science MCQs Questions with Answers to help students understand the concept very well. https://ncertmcq.com/mcq-questions-for-class-8-science-with-answers/

You can refer to NCERT Solutions for Class 8 Science Chapter 4 Materials: Metals and Non-Metals to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Class 8 Science Chapter 4 MCQ With Answers

Science Class 8 Chapter 4 MCQs On Materials: Metals and Non-Metals

Choose the correct option in the following questions:

Class 8 Science Chapter 4 MCQ Question 1.
Which of the following is a liquid at room temperature?
(a) Iron
(b) Bromine
(c) Iodine
(d) Phosphorus

Answer

Answer: (b) Bromine

---

Metals And Non Metals Class 8 MCQ Question 2.
The most reactive metal is
(a) copper
(b) silver
(c) potassium
(d) calcium

Answer

Answer: (c) potassium

---

Class 8 Science Ch 4 MCQ Question 3.
The metal which is liquid at room temperature is
(a) sodium
(b) bromine
(c) calcium
(d) mercury

Answer

Answer: (d) mercury

---

Metal And Non Metals Class 8 MCQ Question 4.
Which one of the following metals is the most ductile?
(a) Aluminium
(b) Copper
(c) Silver
(d) Gold

Answer

Answer: (d) Gold

---

Metals And Non Metals MCQ Class 8 Question 5.
Which one of the following metals is the most reactive and stored in kerosene?
(a) Iron
(b) Gold
(c) Copper
(d) Potassium

Answer

Answer: (d) Potassium

---

Class 8 Metals And Non Metals MCQ Question 6.
Name the gas evolved when magnesium reacts with dilute hydrochloric acid
(a) Chlorine
(b) Oxygen
(c) hydrogen
(d) Nitrogen

Answer

Answer: (c) hydrogen

---

MCQ Questions For Class 8 Science Chapter 4 Question 7.
The metal which is not corroded by air, water and acid is
(a) copper
(b) zinc
(c) aluminium
(d) gold

Answer

Answer: (d) gold

---

Metals And Nonmetals Class 8 MCQ Question 8.
Metals are
(a) soft and brittle
(b) hard and solid
(c) liquid
(d) generally liquid

Answer

Answer: (b) hard and solid

---

Ch 4 Science Class 8 MCQ Question 9.
Materials having qualities of both metals and non-metals are
(a) alloys
(b) metalloids
(c) noble metals
(d) none of these

Answer

Answer: (b) metalloids

---

Class 8 Chapter 4 Science MCQ Question 10.
Which metal reacts readily with cold water?
(a) Gold
(b) Silver
(c) Magnesium
(d) Calcium

Answer

Answer: (d) Calcium

---

Chapter 4 Science Class 8 MCQ Question 11.
The best electrical conductor is
(a) gold
(b) copper
(c) silver
(d) aluminium

Answer

Answer: (c) silver

---

MCQ For Class 8 Science Chapter 4 Question 12.
Iron is galvanised by coating it with
(a) chromium
(b) sodium
(c) magnesium
(d) zinc

Answer

Answer: (d) zinc

---

MCQ On Metals And Non Metals Class 8 Question 13.
Out of these, which one is more reactive with water?
(a) Sodium
(b) Magnesium
(c) Iron
(d) Copper

Answer

Answer: (a) Sodium

---

Science Class 8 Chapter 4 MCQ Question 14.
Boron is
(a) metal
(b) metalloid
(c) non-metal
(d) alkali

Answer

Answer: (b) metalloid

---

Class 8 Science Chapter 4 MCQ With Answers Question 15.
A mineral from which. a metal can be extracted on the commercial scale, economically is called
(a) ore
(b) metalloid
(e) corrosion
(d) metal

Answer

Answer: (a) ore

---

Match the following items given in Column ‘A’ with that in Column ‘B’:

Column ‘A’	Column ‘B’
Zinc	Non-metal
iodine	Mercury
Liquid	Carbon
Graphite	Silver
Silicon	Water purification
Malleability	Metalloid
Chlorine	Bad conductor of heat
Non-metal	Metal

Answer

Answer:

Column ‘A’	Column ‘B’
Zinc	Metal
iodine	Non-metal
Liquid	Mercury
Graphite	Carbon
Silicon	Metalloid
Malleability	Silver
Chlorine	Water purification
Non-metal	Bad conductor of heat

---

Fill in the blanks with appropriate words:

1. …………. is used in making mirrors.

Answer

Answer: Silver

---

2. …………. foils are used as packing material.

Answer

Answer: aluminium

---

3. …………. is used to prepare sulphuric acid.

Answer

Answer: Sulphur trioxide

---

4. A solution of …………. in alcohol has antiseptic properties.

Answer

Answer: iodine

---

5. Both …………. and …………. find extensive use in the native form as well as compounds.

Answer

Answer: metal, non-metal

---

6. Nitrates of …………. find use in photography.

Answer

Answer: silver

---

State whether the statements given below are True or False:

1. Sodium is more reactive than magnesium.

Answer

Answer: True

---

2. Magnesium reacts with cold water.

Answer

Answer: False

---

3. All înetal exist in solid form at room temperature.

Answer

Answer: False

---

4. Gallium has a low melting point.

Answer

Answer: True

---

5. Gold is allayed with copper to make it hard.

Answer

Answer: True

---

We hope the given NCERT MCQ Questions for Class 8 Science Chapter 4 Materials: Metals and Non-Metals with Answers Pdf free download will help you. If you have any queries regarding Materials: Metals and Non-Metals CBSE Class 8 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Class 8 Science MCQ:

• Crop Production and Management Class 8 MCQ
• Microorganisms: Friend and Foe Class 8 MCQ
• Synthetic Fibres and Plastics Class 8 MCQ
• Materials: Metals and Non-Metals Class 8 MCQ
• Coal and Petroleum Class 8 MCQ
• Combustion and Flame Class 8 MCQ
• Conservation of Plants and Animals Class 8 MCQ
• Cell Structure and Functions Class 8 MCQ
• Reproduction in Animals Class 8 MCQ
• Reaching the Age of Adolescence Class 8 MCQ
• Force and Pressure Class 8 MCQ
• Friction Class 8 MCQ
• Sound Class 8 MCQ
• Chemical Effects of Electric Current Class 8 MCQ
• Some Natural Phenomena Class 8 MCQ
• Light Class 8 MCQ
• Stars and the Solar System Class 8 MCQ
• Pollution of Air and Water Class 8 MCQ

Check the below Online Education NCERT MCQ Questions for Class 9 Science Chapter 11 Work and Energy with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Work and Energy Class 9 Science MCQs Questions with Answers to help students understand the concept very well. https://ncertmcq.com/mcq-questions-for-class-9-science-with-answers/

You can refer to NCERT Solutions for Class 9 Science Chapter 11 Work and Energy to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Class 9 Science Physics Chapter 11 MCQ With Answers

Physics Class 9 Chapter 11 MCQs On Work and Energy

Work And Energy Class 9 MCQ Question 1.
When a body falls freely towards the earth, then its total energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases

Answer

Answer: (c) remains constant

---

MCQ On Work And Energy Class 9 Question 2.
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
(a) does not change
(b) becomes twice to that of initial
(c) becomes 4 times that of initial
(d) becomes 16 times that of initial

Answer

Answer: (a) does not change

---

Work And Energy Class 9 MCQ With Answers Question 3.
In case of negative work the angle between the force and displacement is (NCERT Exemplar)
(a) 0°
(b) 45°
(c) 90°
(d) 180°

Answer

Answer: (d) 180°

---

Kinetic Energy Calculator is a handy tool that solves the kinetic energy problems easily & quickly.

Class 9 Work And Energy MCQ Question 4.
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are lo m above the ground, they have the same.
(a) acceleration
(b) momenta
(c) potential energy
(d) kinetic energy

Answer

Answer: (a) acceleration

---

Class 9 Science Chapter 11 MCQ Question 5.
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 ms²)
(a) 6 × 10³ J
(b) 6 J
(c) 0.6 J
(d) zero

Answer

Answer: (d) zero

---

MCQ Of Work And Energy Class 9 Question 6.
Which one of the following is not the unit of energy?
(a) joule
(b) newton metre
(c) kilowatt
(d) kilowatt hour

Answer

Answer: (c) kilowatt

---

Work And Energy MCQ Class 9 Question 7.
The work done on an object does not depend upon the
(a) displacement
(b) force applied
(c) angle between force and displacement
(d) initial velocity of the object

Answer

Answer: (d) initial velocity of the object

---

Work And Energy Class 9 MCQ Questions With Answers Question 8.
Water stored in a dam possesses
(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy

Answer

Answer: (d) potential energy

---

Class 9 Science Ch 11 MCQ Question 9.
A body is falling from a height h. After it has fallen a height \(\frac{h}{2}\), it will possess
(a) only potential energy
(b) only kinetic energy
(c) half potential and half kinetic energy
(d) more kinetic and less potential energy

Answer

Answer: (c) half potential and half kinetic energy

---

MCQ Work And Energy Class 9 Question 10.
The number of joules contained in 1 kWh is
(a) 36 × 10⁵ J
(b) 3.6 × 10⁷ J
(c) 36 × 10⁸ J
(d) 3.7 × 10⁷ J

Answer

Answer: (a) 36 × 10⁵ J

---

Work Energy And Power Class 9 MCQ Question 11.
Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. What is ratio of the powers of person A and B?
(a) 1 : 2
(b) 1 : 4
(c) 2 : 1
(d) 14 : 1

Answer

Answer: (c) 2 : 1

---

MCQ Questions On Work And Energy Class 9 Question 12.
Which of the following graphs best represents graphical relation between momentum P and kinetic energy K for a body in motion?

Answer

Answer: (d)

---

Work And Energy Class 9 MCQ Online Test Question 13.
If speed of a car becomes 2 times, its kinetic energy becomes
(a) 4 times
(b) 8 times
(c) 16 times
(d) 12 times

Answer

Answer: (a) 4 times

---

Ch 11 Science Class 9 MCQ Question 14.
Work done by friction
(a) increases kinetic energy of body
(b) decreases kinetic energy of body
(c) increases potential energy of body
(d) decreases potential energy of body.

Answer

Answer: (b) decreases kinetic energy of body

---

MCQ On Work And Energy Class 9 Pdf Question 15.
When a coil spring is compressed, the work is done on the spring. The elastic potential energy
(a) increases
(b) decreases
(c) disappears
(d) remains unchanged

Answer

Answer: (a) increases

---

Question 16.
One joule work is said to be done when
(a) a force of 1 N displaces a body by 1 cm
(b) a force of 1 N displaces a body by 1 m
(c) a force of 1 dyne displaces a body by 1 m
(d) a force of 1 dyne displaces a body by 1 cm.

Answer

Answer: (b) a force of 1 N displaces a body by 1 m

---

Question 17.
SI unit of power is
(a) watt
(b) joule
(c) newton
(d) metre

Answer

Answer: (a) watt

---

Question 18.
Mechanical energy of a body includes
(a) kinetic energy only
(b) potential energy only
(c) kinetic energy and potential energy
(d) none of these

Answer

Answer: (c) kinetic energy and potential energy

---

Question 19.
Commercial unit of energy is
(a) joule
(b) kWh
(c) watt
(d) newton

Answer

Answer: (b) kWh

---

Question 20.
Potential energy of a body depends on its
(a) position
(b) configuration
(c) position and configuration
(d) mass and velocity

Answer

Answer: (c) position and configuration

---

Fill in the blanks

1. Work done is product of ………….. and distance moved the direction of the force.

Answer

Answer: force

---

2. If the angle between force and displacement is …………. then work done is said to be zero.

Answer

Answer: 90°

---

3. Energy of a body is defined as the capacity or …………. to do work.

Answer

Answer: ability

---

4. Mechanical energy includes ………….. and ……………

Answer

Answer: kinetic energy, potential energy

---

5. Energy can neither be ………….. nor ………….. it can only transformed from one form to another.

Answer

Answer: created, destroyed

---

6. ………….. is defined as the rate of doing work.

Answer

Answer: Power

---

7. Commercial unit of energy is ………………

Answer

Answer: kilowatt hour

---

Match the following columns

Column A	Column B
(a) SI unit of power	(i) 1/2 mv2
(b) Kinetic energy	(ii) The change of one form of energy into another
(c) Potential energy	(iii) watt
(d) SI unit of work	(iv) If applied force on an object and displacement is in opposite direction.
(e) Negative work	(v) Energy possessed by a body due to its position or configuration.
(f) Power	(vi) Joule
(g) Expression of kinetic energy	(vii) Energy possessed by a body due to its motion.
(h) Transformation of energy	(viii) Rate of doing work

Answer

Answer:

Column A	Column B
(a) SI unit of power	(iii) watt
(b) Kinetic energy	(vii) Energy possessed by a body due to its motion.
(c) Potential energy	(v) Energy possessed by a body due to its position or configuration.
(d) SI unit of work	(vi) Joule
(e) Negative work	(iv) If applied force on an object and displacement is in opposite direction.
(f) Power	(viii) Rate of doing work
(g) Expression of kinetic energy	(i) 1/2 mv2
(h) Transformation of energy	(ii) The change of one form of energy into another

---

Crossword Puzzle:

Across:
1. SI unit of work
4. Work done if force is perpendicular to displacement
7. Rate of doing work
8. Energy possessed by a body due to virtue of its motion
Down:
2. Ability to do work
3. Energy possessed by a body due to virtue of its position or configuration
5. Product of force and displacement
6. SI unit of power

Answer

Answer:
Across:
1. Joule
4. Zerowork
7. Power
8. Kinetic energy

Down:
2. Energy
3. Potential energy
5. Work
6. Watt

---

We hope the given NCERT MCQ Questions for Class 9 Science Chapter 11 Work and Energy with Answers Pdf free download will help you. If you have any queries regarding Work and Energy CBSE Class 9 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Class 9 Science Physics MCQ:

• Motion Class 9 MCQ
• Force and Laws of Motion Class 9 MCQ
• Gravitation Class 9 MCQ
• Work and Energy Class 9 MCQ
• Sound Class 9 MCQ

Check the below Online Education NCERT MCQ Questions for Class 8 Science Chapter 10 Reaching the Age of Adolescence with Answers Pdf free download. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. We have provided Reaching the Age of Adolescence Class 8 Science MCQs Questions with Answers to help students understand the concept very well. https://ncertmcq.com/mcq-questions-for-class-8-science-with-answers/

You can refer to NCERT Solutions for Class 8 Science Chapter 10 Reaching the Age of Adolescence to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Class 8 Science Chapter 10 MCQ With Answers

Science Class 8 Chapter 10 MCQs On Reaching the Age of Adolescence

Choose the correct option in the following questions:

Reaching The Age Of Adolescence Class 8 MCQ Question 1.
Adolescence is the period of
(a) 5 to 10 years
(b) 11 to 19 years
(c) 22 to 28 years
(d) 30 to 40 years

Answer

Answer: (b) 11 to 19 years

---

Class 8 Science Chapter 10 MCQ Question 2.
When a sperm having X-chromosome fuses with the ovum, the child born will be
(a) male
(b) female
(c) male as well as female twin
(d) it depends on the chance of fusion

Answer

Answer: (b) female

---

Class 8 Science Ch 10 MCQ Question 3.
How many pairs of Chromosomes are found in nuclei of their cells?
(a) 22 pairs
(b) 23 pairs
(c) 24 pairs
(d) 25 pairs

Answer

Answer: (b) 23 pairs

---

MCQ Questions For Class 8 Science Chapter 10 Question 4.
Children gain height during
(a) adolescence
(b) endocrine
(c) balanced food
(d) menarche

Answer

Answer: (a) adolescence

---

Ch 10 Science Class 8 MCQ Question 5.
Testes secrete
(a) thyroxin
(b) estrogen
(c) testosterone
(d) iodine

Answer

Answer: (c) testosterone

---

Class 8 Chapter 10 Science MCQ Question 6.
Adam’s apple is
(a) enlarged larynx
(b) mammary glands
(c) apple of adam
(d) red apple

Answer

Answer: (a) enlarged larynx

---

Ncert Class 8 Science Chapter 10 MCQ Question 7.
The chemical substances which are secreted from endocrine glands are called
(a) puberty
(b) hormones
(c) estrogen
(d) adolescence

Answer

Answer: (b) hormones

---

Class 8 Ch 10 Science MCQ Question 8.
Out of these which one determines the sex of the baby?
(a) Hormones
(b) Chloroplast
(c) Chromosomes
(d) Pituitary gland

Answer

Answer: (c) Chromosomes

---

Chapter 10 Science Class 8 MCQ Question 9.
What is the stoppage of menstruation called?
(a) Menarche
(b) Menopause
(c) Gametes
(d) Insulin

Answer

Answer: (b) Menopause

---

Adolescence Class 8 MCQ Question 10.
Which hormone is secreted by adrenal glands?
(a) Adrenalin
(b) Insulin
(c) Testosterone
(d) Estrogen

Answer

Answer: (a) Adrenalin

---

Science Class 8 Chapter 10 MCQ Question 11.
Reproduction age in women starts when their
(a) menstruation starts
(b) breasts start developing
(c) body weight increases
(d) height increases

Answer

Answer: (a) menstruation starts

---

Class 8 Reaching The Age Of Adolescence MCQ Question 12.
Which is male gonads?
(a) Hair
(b) Chest
(c) Moustache
(d) Testis

Answer

Answer: (d) Testis

---

Chapter 10 Class 8 Science MCQ Question 13.
The beginning of menstruation at puberty is called
(a) ovulation
(b) menstruation
(c) menarche
(d) menopause

Answer

Answer: (c) menarche

---

Class 8 Science Ch 10 MCQ Questions Question 14.
In males, the sex chromosome consists
(a) one X and one Y
(b) both X and X
(c) both Y and Y
(d) one M and one X

Answer

Answer: (a) one X and one Y

---

Ch 10 Class 8 Science MCQ Question 15.
Production of thyroxin requires
(a) sodium
(b) magnesium
(c) iodine
(d) bromine

Answer

Answer: (c) iodine

---

Question 16.
The period of life, when the body undergoes changes, leading to reproductive maturity, is called
(a) childhood
(b) adolescence
(c) Grown up
(d) Old age

Answer

Answer: (b) adolescence

---

Question 17
The human body undergoes several changes during adolescence. These changes mark the onset of
(a) Puberty
(b) Prematurity
(c) Post adolescence
(d) ageing

Answer

Answer: (a) Puberty

---

Question 18.
Adam’s apple is prominent in
(a) Boys of any age
(b) Adolescent girls
(c) Girls of any age
(d) Adolescent boys

Answer

Answer: (d) Adolescent boys

---

Question 19.
Larynx is also called
(a) Voice box
(b) Sound box
(c) Black box
(d) All of the above

Answer

Answer: (a) Voice box

---

Question 20.
Acne and pimples on the face is due to secretion of
(a) bile from liver
(b) Oil glands during puberty
(c) Enzymes in the digestive tract
(d) Tear from tear glands

Answer

Answer: (b) Oil glands during puberty

---

Question 21.
Testosterone is a hormone found in human ___
(a) Children
(b) males and females
(c) Females only
(d) Males only

Answer

Answer: (d) Males only

---

Question 22.
The first menstrual flow is called
(a) Menstruation
(b) Mensuration
(c) Menarche
(d) Menopause

Answer

Answer: (c) Menarche

---

Question 23.
Menopause occurs at the age of
(a) 10-12 years in boys
(b) 45-50 years in men
(c) 10-12 years in girls
(d) 45-50 years in women

Answer

Answer: (d) 45-50 years in women

---

Question 24.
When a sperm containing Y chromosome fertilizes an egg with X chromosome, the zygote develops into a _____ child
(a) Female
(b) Either a male or female
(c) Male
(d) No child

Answer

Answer: (c) Male

---

Question 25.
The change from larvae to adult is called
(a) Metabolism
(b) Metamorphosis
(c) Metastasis
(d) Morphology

Answer

Answer: (b) Metamorphosis

---

Match the following items given in Column ‘A with that in Column B’:

Column A	Column B
(i) Pituitary gland	(a) Thyroxine
(ii) Thyroid gland	(b) Adrenalin
(iii) Adrenal gland	(c) Insulin
(iv) Pancreas	(d) Master gland
(v) XX chromosomes	(e) Boy
(vi) XY chromosomes	(f) Girl

Answer

Answer:

Column A	Column B
(i) Pituitary gland	(d) Master gland
(ii) Thyroid gland	(a) Thyroxine
(iii) Adrenal gland	(b) Adrenalin
(iv) Pancreas	(c) Insulin
(v) XX chromosomes	(f) Girl
(vi) XY chromosomes	(e) Boy

---

Fill in the blanks with the appropriate words:

1. Children gain height during …………..

Answer

Answer: adolescence

---

2. The onset of ………….. and ………….. of reproductive parts are controlled by hormones.

Answer

Answer: puberty, maturity

---

3. Hormones are secretions of ………….. glands.

Answer

Answer: endocrine

---

4. Pancreas secretes ………….., thyroid produces ………….. and adrenals produce …………..

Answer

Answer: insulin, thyroxine, adrenalin

---

5. Testosterone is the ………….. hormone.

Answer

Answer: male

---

6. ………….. of the unborn child depends on whether the zygote has XX or XY chromosomes.

Answer

Answer: Sex

---

7. It is important to eat ………….. and maintain personal hygiene during adolescence.

Answer

Answer: balanced food.

---

State whether the statements given below are True or False:

1. Hormones are secreted from endocrine gland.

Answer

Answer: True

---

2. Adolescence period cover 30-35 years of age.

Answer

Answer: False

---

3. 23 pair of chlorosomes are found in nuclei of the cells.

Answer

Answer: True

---

4. Testes are responsible for production of sperms.

Answer

Answer: True

---

5. Stoppage of menstruation is called adolescence.

Answer

Answer: False

---

6. Mother is responsible for the sex determination of the baby.

Answer

Answer: False

---

We hope the given NCERT MCQ Questions for Class 8 Science Chapter 10 Reaching the Age of Adolescence with Answers Pdf free download will help you. If you have any queries regarding Reaching the Age of Adolescence CBSE Class 8 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Class 8 Science MCQ:

• Crop Production and Management Class 8 MCQ
• Microorganisms: Friend and Foe Class 8 MCQ
• Synthetic Fibres and Plastics Class 8 MCQ
• Materials: Metals and Non-Metals Class 8 MCQ
• Coal and Petroleum Class 8 MCQ
• Combustion and Flame Class 8 MCQ
• Conservation of Plants and Animals Class 8 MCQ
• Cell Structure and Functions Class 8 MCQ
• Reproduction in Animals Class 8 MCQ
• Reaching the Age of Adolescence Class 8 MCQ
• Force and Pressure Class 8 MCQ
• Friction Class 8 MCQ
• Sound Class 8 MCQ
• Chemical Effects of Electric Current Class 8 MCQ
• Some Natural Phenomena Class 8 MCQ
• Light Class 8 MCQ
• Stars and the Solar System Class 8 MCQ
• Pollution of Air and Water Class 8 MCQ

Check the below Online Education NCERT MCQ Questions for Class 8 Science Chapter 16 Light with Answers Pdf free download. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. We have provided Light Class 8 Science MCQs Questions with Answers to help students understand the concept very well. https://ncertmcq.com/mcq-questions-for-class-8-science-with-answers/

You can refer to NCERT Solutions for Class 8 Science Chapter 16 Light to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Class 8 Science Chapter 16 MCQ With Answers

Science Class 8 Chapter 16 MCQs On Light

Choose the correct option in the following questions:

Light Class 8 MCQ Question 1.
A smooth shining surface, which rebounds the light back in same or in different direction, is called
(a) a mirror
(b) a lens
(c) reflection of light
(d) point of incidence

Answer

Answer: (a) a mirror

---

Light MCQ Class 8 Question 2.
Beam of light striking the reflecting surface is called
(a) reflecting ray
(b) incident ray
(c) refracted ray
(d) normal ray

Answer

Answer: (b) incident ray

---

Class 8 Science Chapter 16 MCQ Question 3.
Band of seven colours is called
(a) VIBGYOR
(b) spectrum
(c) dispersion
(d) reflection

Answer

Answer: (b) spectrum

---

MCQ On Light Class 8 Question 4.
Front balged part of the eyeball is called
(a) cornea
(b) choroid
(c) pupil
(d) retina

Answer

Answer: (a) cornea

---

Class 8 Light MCQ Question 5.
Which one of the following statements is correct regarding rods and cones in the human eye?
(a) Cones are sensitive to dim light
(b) Cones are sensitive to bright light
(c) Rods are sensitive to bright light
(d) Rods can sense colour

Answer

Answer: (b) Cones are sensitive to bright light

---

MCQ Of Light Class 8 Question 6.
In case of reflection of light, the angle of incidence (i) and the angle of reflection (r) are related as
(a) i = r
(b) i < r
(c) i > r
(d) no definite relation

Answer

Answer: (a) i = r

---

Class 8 Science Light MCQ Question 7.
Name the type of mirror used as a backview mirror.
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) Any of these

Answer

Answer: (c) Convex mirror

---

Class 8 Science Ch 16 MCQ Question 8.
Visually impaired people can read and write using
(a) electronic writer
(b) digital pens
(c) braille system
(d) hearing aids

Answer

Answer: (c) braille system

---

Refraction And Dispersion Of Light Class 8 MCQ Question 9.
The image formed by a camera and a simple microscope are respectively
(a) real and real
(b) real and virtual
(c) virtual and virtual
(d) virtual and real

Answer

Answer: (b) real and virtual

---

Light Chapter Class 8 MCQ Question 10.
What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?
(a) 60°
(b) 45°
(c) 90°
(d) 180°

Answer

Answer: (b) 45°

---

MCQ On Light Class 8 Pdf Question 11.
The splitting of white light into its seven constituent colours is called
(a) refraction
(b) dispersion
(c) deviation
(d) reflection

Answer

Answer: (b) dispersion

---

MCQs On Light Class 8 Question 12.
The defect due to which a person is not able to see the distant objects clearly:
(a) Myopia
(b) Hypermetropia
(c) Cornea
(d) Cataract

Answer

Answer: (a) Myopia

---

Class 8 Science Chapter Light MCQ Question 13.
The amount of light entering the eye is controlled by
(a) eye lens
(b) cornea
(c) iris
(d) ciliary muscle

Answer

Answer: (c) iris

---

MCQs Of Light Class 8 Question 14.
Myopia can be corrected by using a
(a) concave lens
(b) convex lens
(c) opaque lens
(d) micro lens

Answer

Answer: (a) concave lens

---

Ch 16 Science Class 8 MCQ Question 15.
Light enters the eye through
(a) eye lens
(b) pupil
(c) cornea
(d) retina

Answer

Answer: (c) cornea

---

Reflection Of Light Class 8 MCQ Question 16.
If the angle of incidence of light falling on a plane mirror is 30°, what will be the angle of reflection?
(a) 90°
(b) 60°
(c) 30°
(d) 0°

Answer

Answer: (c) 30 degree

---

Question 17.
When we stand in front of our dressing table, our left hand seems to be right and right seems to be left. This is called
(a) Left-right confusion
(b) Lateral inversion
(c) Up -side down phenomenon
(d) mirage

Answer

Answer: (b) Lateral inversion

---

Question 18.
Light passing through a prism splits into seven colours. This is called
(a) Dispersion
(b) Dissolution
(c) Division
(d) None of the above

Answer

Answer: (a) Dispersion

---

Question 19.
Rainbow is a natural phenomenon showing
(a) Reflection
(b) Deflection
(c) Dispersion
(d) Diversion

Answer

Answer: (a) Reflection

---

Question 20.
In the retina of the eye, the area having no sensory cells is called
(a) iris
(b) Blind spot
(c) cornea
(d) Dark spot

Answer

Answer: (b) Blind spot

---

Question 21.
If light falls perpendicularly on a plane mirror, what will be the angle in which it will be reflected?
(a) 45°
(b) 90°
(c) 180°
(d) 360°

Answer

Answer: (c) 180 degrees

---

Question 22.
Which of the following is not a luminous object?
(a) sun
(b) candle
(c) moon
(d) Tube light

Answer

Answer: (c) moon

---

Question 23.
To make a kaleidoscope we require
(a) Three plane mirrors
(b) Four plane mirrors
(c) Three glass sheets
(d) Four glass sheets

Answer

Answer: (a) Three plane mirrors

---

Question 24.
In our eye _______ cells can sense colour
(a) Rod
(b) Cone
(c) Both rod and cone
(d) Neither rod nor cone

Answer

Answer: (b) Cone

---

Question 25.
An owl can see clearly at night but not day time because it has
(a) More rods and few cones
(b) Less rod and more cones
(c) More rods and more cone
(d) Less rods and less cones

Answer

Answer: (a) More rods and few cones

---

Match the following items given in Column A with that in Column ‘B’:

Column A	Column B
(i) Cornea	(a) Transparent front part of eye
(ii) Pupil	(b) Layer on which impression of images is formed
(iii) Iris	(c) Point on retina where there are no nerve endings
(iv) Retina	(d) Sensitive for bright light
(v) Blind spot	(e) Is a small opening in the cornea
(vi) Rods	(f) Sensitive for dim light
(vii) Cones	(g) Controls the size of the pupil

Answer

Answer:

Column A	Column B
(i) Cornea	(a) Transparent front part of eye
(ii) Pupil	(e) Is a small opening in the cornea
(iii) Iris	(g) Controls the size of the pupil
(iv) Retina	(b) Layer on which impression of images is formed
(v) Blind spot	(c) Point on retina where there are no nerve endings
(vi) Rods	(f) Sensitive for dim light
(vii) Cones	(d) Sensitive for bright light

---

Fill in the blanks with the appropriate words:

1. Impression of an image persists for …………. of the second on retina.

Answer

Answer: 1/6 th

---

2. Angle of reflection is always …………. to the angle of incidence.

Answer

Answer: equal

---

3. …………. is a small opening in the corner.

Answer

Answer: Pupil

---

4. Cones are sensitive to …………. light.

Answer

Answer: bright

---

5. Muscles attached to the eye lens …………. and the lens becomes …………. when distant objects are to be seen.

Answer

Answer: relax, thinner

---

6. To keep our eyes fit our diet should include vitamin …………. rich eatables.

Answer

Answer: A

---

7. Impression of an image in eye is formed on ………….

Answer

Answer: retina

---

8. Braille system has …………. dot patterns.

Answer

Answer: 63

---

State whether the statements given below are True or False:

1. Both incident ray and reflected ray lie in the same plane.

Answer

Answer: True

---

2. Diffused reflection is due to the failure of the laws of reflection.

Answer

Answer: False

---

3. The image formed by plane mirror is laterally inverted.

Answer

Answer: True

---

4. The iris is the coloured part of the eye.

Answer

Answer: True

---

5. Rods are sensitive to bright light.

Answer

Answer: False

---

6. Changing of the thickness of the eye lens is called accommodation.

Answer

Answer: True

---

We hope the given NCERT MCQ Questions for Class 8 Science Chapter 16 Light with Answers Pdf free download will help you. If you have any queries regarding Light CBSE Class 8 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Class 8 Science MCQ:

• Crop Production and Management Class 8 MCQ
• Microorganisms: Friend and Foe Class 8 MCQ
• Synthetic Fibres and Plastics Class 8 MCQ
• Materials: Metals and Non-Metals Class 8 MCQ
• Coal and Petroleum Class 8 MCQ
• Combustion and Flame Class 8 MCQ
• Conservation of Plants and Animals Class 8 MCQ
• Cell Structure and Functions Class 8 MCQ
• Reproduction in Animals Class 8 MCQ
• Reaching the Age of Adolescence Class 8 MCQ
• Force and Pressure Class 8 MCQ
• Friction Class 8 MCQ
• Sound Class 8 MCQ
• Chemical Effects of Electric Current Class 8 MCQ
• Some Natural Phenomena Class 8 MCQ
• Light Class 8 MCQ
• Stars and the Solar System Class 8 MCQ
• Pollution of Air and Water Class 8 MCQ

Check the below NCERT MCQ Questions for Class 11 Physics Chapter 1 Physical World with Answers Pdf free download. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. We have provided Physical World Class 11 Physics MCQs Questions with Answers to help students understand the concept very well. https://ncertmcq.com/mcq-questions-for-class-11-physics-with-answers/

Class 9 Physics Chapter 1 MCQ With Answers

Physics Class 9 Chapter 1 MCQs On Physical World

MCQ Questions For Class 11 Physics Chapter 1 Question 1.
The word Science originates from the Latin verb Scientia meaning
(a) to know
(b) to see
(c) to experience
(d) to observe

Answer

Answer: (a) to know

---

Class 11 Physics Chapter 1 MCQ Question 2.
Atomic and molecular phenomena are dealt with by
(a) Newtonian Mechanics
(b) fluid Mechanics
(c) applied Mechanics
(d) Quantum Mechanics

Answer

Answer: (d) Quantum Mechanics

---

Physical World Class 11 MCQ Questions Question 3.
Wave picture of light failed to explain.
(a) the photoelectric effect
(b) polarization of light
(c) diffraction of light
(d) interference of light

Answer

Answer: (a) the photoelectric effect

---

Class 11 Physics Chapter 1 MCQ With Answers Question 4.
Heliocentric theory proposed by Nicolas Copernicus was
(a) replaced by circular orbits to fit the data better
(b) replaced by elliptical orbits to fit the data better
(c) replaced by elliptical orbits to fit the taste of new rulers of Italy
(d) replaced by parabolic orbits to fit the data better

Answer

Answer: (b) replaced by elliptical orbits to fit the data better

---

Physical World Class 11 MCQ Question 5.
Just as a new experiment may suggest an alternative theoretical model, a theoretical advance may suggest what to look for in some for in some experiments. Which of the following experiments can be considered to support this claim?
(a) Davisson and Germer Experiment
(b) experimental discovery of positron
(c) scattering of alpha particle or the gold foil experiment
(d) Michelson Morley experiment

Answer

Answer: (b) experimental discovery of positron

---

Physics Class 11 Chapter 1 MCQ Questions Question 6.
The scientific method is
(a) a prescribed method for investigating phenomena, acquiring new knowledge…
(b) A procedure for proposing new hypothesis
(c) a body of techniques for investigating phenomena, acquiring new knowledge…
(d) A method for proposing new theories.

Answer

Answer: (c) a body of techniques for investigating phenomena, acquiring new knowledge…

---

MCQ On Physical World Class 11 Question 7.
A scientific theory
(a) cannot be changed but can be reformulated
(b) is fixed once and for all because it is logical
(c) is changed to suit new fashion among scientists
(d) can be revised if required to fit new phenomenon or data

Answer

Answer: (d) can be revised if required to fit new phenomenon or data

---

Ch 1 Physics Class 11 MCQ Question 8.
Which of the following is a possible first step in applying the scientific method
(a) Conducting tests
(b) Formulating a hypothesis
(c) Formulation of a question
(d) Building a theory

Answer

Answer: (c) Formulation of a question

---

Class 11 Physics Ch 1 MCQ Question 9.
Which of the following is a possible final step in applying the scientific method
(a) Formulating a hypothesis
(b) Building a theory
(c) Analysis of test results
(d) Formulation of a question

Answer

Answer: (c) Analysis of test results

---

MCQs Of Physics Class 11 Chapter 1 With Answers Question 10.
Physics is a
(a) Applied Science
(b) Mathematical Science
(c) Engineering Science
(d) Natural Science

Answer

Answer: (d) Natural Science

---

Physics Class 11 Chapter 1 MCQ Question 11.
Newtonian mechanics could not explain
(a) fall of bodies on earth
(b) Some of the most basic features of atomic phenomena.
(c) movement of planets
(d) flight of rockets

Answer

Answer: (b) Some of the most basic features of atomic phenomena.

---

We hope the given NCERT MCQ Questions for Class 11 Physics Chapter 1 Physical World with Answers Pdf free download will help you. If you have any queries regarding CBSE Class 11 Physics Physical World MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Class 11 Physics MCQ:

• Physical World Class 11 MCQ
• Units and Measurements Class 11 MCQ
• Motion in a Straight Line Class 11 MCQ
• Motion in a Plane Class 11 MCQ
• Laws of Motion Class 11 MCQ
• Work, Energy and Power Class 11 MCQ
• System of Particles and Rotational Motion Class 11 MCQ
• Gravitation Class 11 MCQ
• Mechanical Properties of Solids Class 11 MCQ
• Mechanical Properties of Fluids Class 11 MCQ
• Thermal Properties of Matter Class 11 MCQ
• Thermodynamics Class 11 MCQ
• Kinetic Theory Class 11 MCQ
• Oscillations Class 11 MCQ
• Waves Class 11 MCQ

Check the below Online Education NCERT MCQ Questions for Class 11 Physics Chapter 10 Mechanical Properties of Fluids with Answers Pdf free download. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. We have provided Mechanical Properties of Fluids Class 11 Physics MCQs Questions with Answers to help students understand the concept very well.

Class 9 Physics Chapter 10 MCQ With Answers

Physics Class 9 Chapter 10 MCQs On Mechanical Properties of Fluids

Mechanical Properties Of Fluids Class 11 MCQ Question 1.
A number of small drops of mercury coalesce adiabatically to form a single drop. The temperature of drop
(a) Increases
(b) Is infinite
(c) Remains unchanged
(d) May decrease or increase depending upon size

Answer

Answer: (d) May decrease or increase depending upon size

---

Mechanical Properties Of Fluids MCQ Question 2.
Surface tension of a soap solution is 1.9 × 10^-2N/m. work done in blowing a bubble of 2.0 cm diameter will be
(a) 7.6 × 10^-6 p J
(b) 15.2 × 10^-6 p J
(c) 1.9 × 10^-6 p J
(d) 1 × 10^-4 p J

Answer

Answer: (b) 15.2 × 10^-6 p J

---

Mechanical Properties Of Fluids MCQ Pdf Question 3.
Plants get water through the roots because of
(a) Capillarity
(b) Viscosity
(c) Gravity
(d) Elasticity

Answer

Answer: (a) Capillarity

---

MCQ On Mechanical Properties Of Fluids Class 11 Question 4.
Choose the wrong statement from the following.
(a) Small droplets of a liquid are spherical due to surface tension
(b) Oil rises through the wick due to capillarity
(c) In drinking the cold drinks through a straw, we use the phenomenon of capillarity
(d) Gum is used to stick two surfaces. In this process we use the property of Adhesion

Answer

Answer: (c) In drinking the cold drinks through a straw, we use the phenomenon of capillarity

---

Class 11 Physics Chapter 10 MCQ Question 5.
The height of a liquid in a fine capillary tube
(a) Increases with an increase in the density of a liquid
(b) Decreases with a decrease in the diameter of the tube
(c) Decreases with an increase in the surface tension
(d) Increases as the effective value of acceleration due to gravity is decreased

Answer

Answer: (d) Increases as the effective value of acceleration due to gravity is decreased

---

MCQs On Mechanical Properties Of Fluids Question 6.
At critical temperature, the surface tension of a liquid
(a) Is zero
(b) Is infinity
(c) Is the same as that at any other temperature
(d) Can not be determined

Answer

Answer: (a) Is zero

---

Mechanical Properties Of Fluids MCQs Question 7.
A capillary tube when immersed vertically in a liquid records a rise of 3 cm. if the tube is immersed in the liquid at an angle of 60° with the vertical, then length of the liquid column along the tube will be
(a) 2 cm
(b) 3 cm
(c) 6 cm
(d) 9 cm

Answer

Answer: (c) 6 cm

---

MCQ On Mechanical Properties Of Fluids Class 12 Question 8.
When the angle of contact between a solid and a liquid is 90°, then
(a) Cohesive force > Adhesive force
(b) Cohesive force < Adhesive force
(c) Cohesive force = Adhesive force
(d) Cohesive force >> Adhesive force

Answer

Answer: (c) Cohesive force = Adhesive force

---

Mechanical Properties Of Fluids Class 12 MCQ Pdf Question 9.
Water rises up to a height of 5 cm in a capillary tube of radius 2 mm. what is the radius of the radius of the capillary tube if the water rises up to a height of 10 cm in another capillary?
(a) 4 mm
(b) 1 mm
(c) 3 mm
(d) 1 cm

Answer

Answer: (b) 1 mm

---

Mechanical Properties Of Fluid MCQ Question 10.
If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is
(a) Acute angle
(b) Obtuse angle
(c) 90°
(d) 0°

Answer

Answer: (d) 0°

---

Mechanical Properties Of Fluids MCQ With Answers Pdf Question 11.
Two soap bubbles have radii in the ratio of 4 : 3. What is the ratio of work done to below these bubbles?
(a) 4 : 3
(b) 16 : 9
(c) 09 : 16
(d) 3 : 4

Answer

Answer: (b) 16 : 9

---

MCQ Questions On Mechanical Properties Of Fluids Class 11 Question 12.
The height of water in a capillary tube of radius 2 cm is 4 cm. what should be the radius of capillary, if the water rises to 8 cm in tube?
(a) 1 cm
(b) 0.1 cm
(c) 2 cm
(d) 4 cm

Answer

Answer: (a) 1 cm

---

Class 11 Physics Mechanical Properties Of Fluids MCQ Question 13.
Water rises up to a height of 4 cm, in a capillary tube immersed vertically in water. What will be the length of water column in the capillary tube, if the tube is immersed in water, at an angle of 60° with the vertical?
(a) 4 cm
(b) 6 cm
(c) 8 cm
(d) 2 cm

Answer

Answer: (c) 8 cm

---

MCQ Questions For Class 11 Physics Chapter 10 Question 14.
The surface of water in contact with glass wall is
(a) Plane
(b) concave
(c) convex
(d) Both b and c

Answer

Answer: (b) concave

---

Mechanical Properties Of Fluids MCQ Pdf Download Question 15.
Pressure inside two soap bubbles is 1.01 and 1.02 atmospheres. ratio between their volume is
(a) 102 : 101
(b) (102)3 : (101)3
(c) 8 : 1
(d) 2 : 1

Answer

Answer: (c) 8 : 1

---

Mechanical Properties Of Fluids Class 12 MCQ Question 16.
One end of a towel dips into a bucket full of water and other end hangs over the bucket. It is found that after some time the towel becomes fully wet. It happens
(a) Because viscosity of eater is high
(b) Because of the capillary action of cotton threads
(c) Because of gravitational force
(d) Because of evaporation of water.

Answer

Answer: (b) Because of the capillary action of cotton threads

---

Mechanical Properties Of Fluids Class 11 Questions And Answers Pdf Question 17.
If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is
(a) Acute angle
(b) Obtuse angle
(c) 90°
(d) 0°

Answer

Answer: (d) 0°

---

Mechanical Properties Of Fluids Class 11 Important Questions Pdf Question 18.
Water rises up to a height h, in a capillary tube of radius r. the mass of the water lifted in the capillary tube is M. if the radius of the capillary tube is doubled, the mass of water that will rise in the capillary tube will be
(a) M
(b) 2M
(c) M/2
(d) 4M

Answer

Answer: (b) 2M

---

Question 19.
5 g of water rises in the bore of capillary tube when it is dipped in water. If the radius of bore capillary tube is doubled, the mass of water that rises in the capillary tube above the outside water level is
(a) 1.5 g
(b) 10 g
(c) 5 g
(d) 15 g

Answer

Answer: (b) 10 g

---

Question 20.
The height of a liquid in a fine capillary tube
(a) Increases with an increase in the density of a liquid
(b) Decreases with a decrease in the diameter of the tube
(c) Decreases with an increase in the surface tension
(d) Increases as the effective value of acceleration due to gravity is decreased

Answer

Answer: (d) Increases as the effective value of acceleration due to gravity is decreased

---

We hope the given NCERT MCQ Questions for Class 11 Physics Chapter 10 Mechanical Properties of Fluids with Answers Pdf free download will help you. If you have any queries regarding CBSE Class 11 Physics Mechanical Properties of Fluids MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Class 11 Physics MCQ:

• Physical World Class 11 MCQ
• Units and Measurements Class 11 MCQ
• Motion in a Straight Line Class 11 MCQ
• Motion in a Plane Class 11 MCQ
• Laws of Motion Class 11 MCQ
• Work, Energy and Power Class 11 MCQ
• System of Particles and Rotational Motion Class 11 MCQ
• Gravitation Class 11 MCQ
• Mechanical Properties of Solids Class 11 MCQ
• Mechanical Properties of Fluids Class 11 MCQ
• Thermal Properties of Matter Class 11 MCQ
• Thermodynamics Class 11 MCQ
• Kinetic Theory Class 11 MCQ
• Oscillations Class 11 MCQ
• Waves Class 11 MCQ

Check the below Online Education NCERT MCQ Questions for Class 9 Science Chapter 5 The Fundamental Unit of Life with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided The Fundamental Unit of Life Class 9 Science MCQs Questions with Answers to help students understand the concept very well. https://ncertmcq.com/mcq-questions-for-class-9-science-with-answers/

You can refer to NCERT Solutions for Class 9 Science Chapter 5 The Fundamental Unit of Life to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Class 9 Science Biology Chapter 5 MCQ With Answers

Biology Class 9 Chapter 5 MCQs On The Fundamental Unit of Life

Fundamental Unit Of Life Class 9 MCQ Question 1.
Which of the following can be made into crystal?
(a) A bacterium
(b) An Amoeba
(c) A virus
(d) A sperm

Answer

Answer: (c) A virus

---

The Fundamental Unit Of Life Class 9 MCQ Question 2.
A cell will swell up if
(a) the concentration of water molecules in the cell is higher than the concentration of water molecules in the surrounding medium.
(b) the concentration of water molecules in the surrounding medium is higher than water molecules concentration in the cell.
(c) the concentration of water molecules is same in the cell and in the surrounding medium.
(d) concentration of water molecules does not matter.

Answer

Answer: (b) the concentration of water molecules in the surrounding medium is higher than water molecules concentration in the cell.

---

Class 9 Science Chapter 5 MCQ Question 3.
Chromosomes are made up of
(a) DNA
(b) Protein
(c) DNA and protein
(d) RNA

Answer

Answer: (c) DNA and protein

---

The Fundamental Unit Of Life MCQ Question 4.
Which of these options are not a function of ribosomes?
(i) It helps in manufacture of protein molecules.
(ii) It helps in manufacture of enzymes.
(iii) It helps in manufacture of hormones.
(iv) It helps in manufacture of starch molecules.
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (iv) and (i)

Answer

Answer: (c) (iii) and (iv)

---

The Fundamental Unit Of Life Class 9 MCQ With Answers Question 5.
Which of these is not related to endoplasmic reticulum?
(a) It behaves as a transport channel for proteins between nucleus and cytoplasm.
(b) It transports materials between various regions in the cytoplasm.
(c) It can be the site of energy generation.
(d) It can be the site for some biochemical activities of the cell.

Answer

Answer: (c) It can be the site of energy generation.

---

Ch 5 Science Class 9 MCQ Question 6.
Following are a few definitions of osmosis:
Read carefully and select the correct definition.
(a) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semi-permeable membrane.
(b) Movement of solvent molecules from its higher concentration to lower concentration.
(c) Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane.
(d) Movement of solute molecules from lower concentration to higher concentration of solution through a semi permeable membrane.

Answer

Answer: (a) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semi-permeable membrane.

---

Class 9 Science Ch 5 MCQ Question 7.
Plasmolysis in a plant cell is defined as
(a) breakdown (lysis) of plasma membrane in hypotonie medium
(b) shrinkageof cytoplasm in hypertonic medium
(c) shrinkage of nucleoplasm
(d) none of them

Answer

Answer: (b) shrinkageof cytoplasm in hypertonic medium

---

Class 9 Fundamental Unit Of Life MCQ Question 8.
Which of the following are covered by a single membrane?
(a) Mitochondria
(b) Vacuole
(c) Lysosome
(d) Plastid

Answer

Answer: (b) Vacuole

---

Chapter 5 Science Class 9 MCQ Question 9.
Find out the false sentence.
(a) Nucleus is involved with the formation of lysosomes.
(b) Nucleus, mitochondria and plastid have DNA, hence they are able to make their own structural proteins.
(c) Mitochondria is said to be the power house of the cell as ATP is generated in them.
(d) Cytoplasm is called as protoplasm.

Answer

Answer: (a) Nucleus is involved with the formation of lysosomes.

---

Class 9 Chapter 5 Science MCQ Question 10.
Find out the correct sentence.
(a) Enzymes packed in lysosomes are made through RER (rough endoplasmic reticulum).
(b) Rough endoplasmic reticulum and smooth endoplasmic reticulum produce lipid and protein respectively.
(c) Endoplasmic reticulum is rélated to the destruction of plasma membrane.
(d) Nucleoid is present inside the nucleoplasm of eukaryotic nucleus.

Answer

Answer: (a) Enzymes packed in lysosomes are made through RER (rough endoplasmic reticulum).

---

Class 9 Science Chapter 5 MCQ With Answers Question 11.
Which cell organelle plays a crucial role in detoxifring many poisons and drugs in a cell?
(a) Golgi apparatus
(b) Lysosomes
(c) Smooth endoplasmic reticulum
(d) Vacuoles

Answer

Answer: (c) Smooth endoplasmic reticulum

---

The Fundamental Unit Of Life Class 9 MCQ Questions Pdf Question 12.
The proteins and lipids, essential for building the cell membrane, are manufactured by
(a) rough endoplasmic reticulum
(b) golgi apparatus
(c) plasma membrane
(d) mitochondria

Answer

Answer: (a) rough endoplasmic reticulum

---

Class 9 Ch 5 Science MCQ Question 13.
The undefined nuclear region of prokaryotes is also known as
(a) nucleus
(b) nucleolus
(c) nucleic acid
(d) nucleoid

Answer

Answer: (d) nucleoid

---

MCQ Of Fundamental Unit Of Life Question 14.
The cell organelle involved in forming complex sugars from simple sugars are
(a) endoplasmic reticulum
(b) ribosomes
(c) plastids
(d) golgi apparatus

Answer

Answer: (d) golgi apparatus

---

Class 9 The Fundamental Unit Of Life MCQ Question 15.
Which out of the following is not a function of vacuole?
(a) Storage
(b) Providing turgidity and rigidity to the cell
(c) Waste excretion
(d) Locomotion

Answer

Answer: (d) Locomotion

---

Question 16.
Amoeba acquires its food through a process, termed
(a) exocytosis
(b) endocytosis
(c) plasmolysis
(d) exocytosis and endocytosis both

Answer

Answer: (b) endocytosis

---

Question 17.
Cell wall of which one of these is not made up of cellulose?
(a) Bacteria
(b) Hydrilla
(c) Mango tree
(d) Cactus

Answer

Answer: (a) Bacteria

---

Question 18.
Silver nitrate solution is used to study
(a) endoplasmic reticulum
(b) golgi apparatus
(c) nucleus
(d) mitochondria

Answer

Answer: (b) golgi apparatus

---

Question 19.
Organelle other than nucleus, containing DNA is
(a) endoplasmic reticulum
(b) golgi apparatus
(c) mitochondria
(d) lysosomes

Answer

Answer: (c) mitochondria

---

Question 20.
Kitchen of the cell is
(a) mitochondria
(b) endoplasmic reticulum
(c) chioroplast
(d) golgi apparatus

Answer

Answer: (c) chioroplast

---

Question 21.
Lipid molecules in the cell are synthesised by
(a) smooth endoplasmic reticulum
(b) rough endoplasmic reticulum
(c) golgi apparatus
(d) plastids

Answer

Answer: (a) smooth endoplasmic reticulum

---

Question 22.
Cell arises from pre-existing cell was stated by
(a) Haeckel
(b) Virchow
(c) Hooke
(d) Schleiden

Answer

Answer: (b) Virchow

---

Question 23.
Cell theory was given by
(a) Schleiden and Schwann
(b) Virchow
(c) Hooke
(d) Haeckel

Answer

Answer: (a) Schleiden and Schwann

---

Question 24.
The only cell organelle seen in prokaryotic cell is
(a) mitochondria
(b) ribosomes
(c) plastids
(d) lysosomes

Answer

Answer: (b) ribosomes

---

Question 25.
Organelle without a cell membrane is
(a) ribosome
(b) golgi apparatus
(c) chioroplast
(d) nucleus

Answer

Answer: (a) ribosome

---

Question 26.
1 μm is
(a) 10^-6 m
(b) 10^-9 m
(c) 10^-10 m
(d) 10^-3 m

Answer

Answer: (a) 10^-6 m

---

Question 27.
Lysosome arises from
(a) endoplasmic reticulum
(b) golgi apparatus
(c) nucleus
(d) mitochondria

Answer

Answer: (b) golgi apparatus

---

Question 28.
Living cells were discovered by
(a) Robert Hooke
(b) Purkinje
(c) Leeuwenhoek
(d) Robert Brown

Answer

Answer: (c) Leeuwenhoek

---

Question 29.
Select the odd one out.
(a) The movement of water across a semi permeable membrane is affected by the amount of substances dissolved in it.
(b) Membranes are made of organic molecules like proteins and lipids.
(c) Molecules soluble in organic solvents can easily pass through the membrane.
(d) Plasma membranes contain chitin sugar in plants.

Answer

Answer: (d) Plasma membranes contain chitin sugar in plants.

---

Fill in the blanks.

1. …………… is a Latin word for ‘a little room’.

Answer

Answer: Cell

---

2. Plant cells are stained using the stain called …………….

Answer

Answer: safranin

---

3. Cells were first discovered by ……………. in 1665.

Answer

Answer: Robert Hooke

---

4. Leeuwenhoek (1674), with the improved microscope, discovered ………….. the in pond water for the first time.

Answer

Answer: free living cells

---

5. Virchow stated that ……………. arise from pre-existing cells.

Answer

Answer: all cells

---

6. The largest cell is …………….

Answer

Answer: ostrich egg

---

7. The …………. and …………… of cells are related to the specific function they perform.

Answer

Answer: shape; size

---

8. The process of …………… helps in movement of carbon dioxide or oxygen across the cell membrane.

Answer

Answer: diffusion

---

9. The movement of water molecules through a selectively permeable membrane is called …………….

Answer

Answer: osmosis

---

10. The …………… of the cell membrane enables the cell to engulf in food and other material from its external environment by process called endocytosis.

Answer

Answer: flexible nature

---

11. The chromatin material gets organised in the form of ………….. when the cell is about to divide.

Answer

Answer: chromosome

---

12. ………….. and …………. help in building the cell membrane by the process of membrane biogenesis.

Answer

Answer: Proteins; lipids

---

13. The hydrolytic enzymes present in the iysosomes are synthesised in the ………………

Answer

Answer: RER

---

14. Chromoplasts that contain …………… are called chioroplasts.

Answer

Answer: green coloured pigment

---

15. The primary function of leucoplasts is to ……………

Answer

Answer: store starch

---

Match the following columns

Column A	Column B
(a) Vacuoles	(i) Store proteins
(b) Lysosomes	(ii) Shrinkage of cells
(c) Outer membrane of mitochondria	(iii) Detoxification of poison and drugs
(d) Elaioplasts	(iv) Turgidity of plant cell
(e) Aleuroplast	(v) Porous in nature
(f) Hypertonic solution	(vi) Scavengers of cell
(g) RER	(vii) Storage and modification
(h) SER	(viii) Store oils
(i) Golgi apparatus	(ix) Protein synthesis

Answer

Answer:

Column A	Column B
(a) Vacuoles	(iv) Turgidity of plant cell
(b) Lysosomes	(vi) Scavengers of cell
(c) Outer membrane of mitochondria	(v) Porous in nature
(d) Elaioplasts	(viii) Store oils
(e) Aleuroplast	(i) Store proteins
(f) Hypertonic solution	(ii) Shrinkage of cells
(g) RER	(ix) Protein synthesis
(h) SER	(iii) Detoxification of poison and drugs
(i) Golgi apparatus	(vii) Storage and modification

---

We hope the given NCERT MCQ Questions for Class 9 Science Chapter 5 The Fundamental Unit of Life with Answers Pdf free download will help you. If you have any queries regarding The Fundamental Unit of Life CBSE Class 9 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Class 9 Science Biology MCQ:

• The Fundamental Unit of Life Class 9 MCQ
• Tissues Class 9 MCQ
• Diversity in Living Organisms Class 9 MCQ
• Why do we Fall Ill Class 9 MCQ
• Natural Resources Class 9 MCQ
• Improvement in Food Resources Class 9 MCQ

Class 10 Science Chemistry Chapter 2 MCQ With Answers

Chemistry Class 10 Chapter 2 MCQs On Acids, Bases and Salts

Acid Bases And Salts Class 10 MCQ Question 1.
What happens when the solution of an acid is mixed with the solution of a base in a test tube?
(I) The temperature of the solution increases
(II) The temperature of the solution decreases
(III) The temperature of the solution remains the same
(IV) Salt formation takes place
(a) Only (I)
(b) (I) and (III)
(c) (I) and (III)
(d) (I) and (IV)
Answer:
(d) (I) and (IV)

Explanation: When an acid reacts with a base, a neutral salt is formed by the neutralisation process. As the neutralisation process is an exothermic reaction, the temperature of the solution increases.
Acid + Base → Salt + Water

Acids Bases And Salts Class 10 MCQ Question 2.
If 10 mL of H₂SO₄ is mixed with 10 mL of Mg(OH)₂ of the same concentration, the resultant solution will give the following colour with a universal indicator:
(a) Red
(b) Yellow
(c) Green
(d) Blue
Answer:
(c) Green.
Explanation: If 10 mL of H₂SO₄ is mixed with 10 mL of Mg(OH)₂ of the same concentration, the resultant solution be MgS04 which is a neutral salt and universal indicator will give the green colour in this solution:

Related Theory:
When an acid reacts with a base it forms salt and water. As a result, acidic properties disappear The process is called neutralisation. For a neutral solution. pH is 7. The solution having pH 7 wilL turn green in colour in universal indicator.

This online pH calculator is designed to determine the pH of an aqueous solution of a given chemical compound.

Class 10 Science Chapter 2 MCQ Question 3.
Which of the following saLts does not contain water of crystatUsatlon?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum
Answer:

Acid Base And Salts Class 10 MCQ Question 4.
A visually challenged student has to perform a lab test to detect the presence of acid in a given solution. The acid-base indicator preferred by him will be:
(a) Blue litmus
(b) Clove oil
(c) Red cabbage extract
(d) Hibiscus extract
Answer:
(b) Clove oil

Explanation: Clove oil is an olfactory indicator. These are the substances that give one type of odour in an acidic medium so a visually challenged student prefers to use clove oil as an acid-base indicator.

As in basic solutions, the smell of clove oil disappears while the smell is retained when mixed with an acid, on the other hand, blue litmus, red cabbage extract and hibiscus extract wouLd not be used as acid-base indicators because in these indicators there will be a change in the colour.

Class 10 Acids Bases And Salts MCQ Question 5.
Baking soda is a mixture of:
(a) Sodium carbonate and acetic acid
(b) Sodium carbonate and tartaric acid
(c) Sodium hydrogen carbonate and tartaric acid
(d) Sodium hydrogen carbonate and acetic acid
Answer:

MCQ Of Acid Base And Salts Class 10 Question 6.
Which of the following gives the correct increasing order of acid strength?
(a) Water < acetic acid < hydrochloric acid
(b) Water < hydrochloric acid < acetic acid
(c) Acetic acid < water < hydrochloric acid
(d) Hydrochloric acid < water < acetic acid
Answer:

Ch 2 Science Class 10 MCQ Question 7.
What is observed when we pour a drop of acetic acid first on red and then on blue litmus papers?
(a) Red litmus paper becomes colourless and blue litmus paper remains blue.
(b) Red litmus paper turns blue and blue litmus paper remains blue.
(c) Red litmus paper remains red and blue litmus paper turns red.
(d) Red litmus paper turns blue and blue litmus paper turns red.
Answer:

Class 10 Science Ch 2 MCQ Question 8.
Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?
(I) It turns lime water milky.
(II) It extinguishes a burning splinter.
(III) It dissolves in a solution of sodium hydroxide.
(IV) It has a pungent odour.
(a) (I) and (II)
(b) (I), (II) and (III)
(c) (II), (III) and (IV)
(d) (I) and (IV)
Answer:
(b) (I), (II) and (III)

Explanation: Reaction of sodium hydrogen carbonate with acetic acid forms sodium acetate and water with carbon dioxide (CO₂) gas.

CO₂ does not have a pungent smell but it shows all the other three properties:

1. turns lime water milky,
2. is a non-supporter of combustion and
3. absorbed by strong alkalis such as NaOH.

MCQ Questions For Class 10 Science Chemistry Chapter 2 Question 9.
Common salt besides being used in the kitchen can also be used as the raw material for making:
(I) Washing soda
(II) Bleaching powder
(III) Baking soda
(IV)Slaked Urne
(a) (I) and (II)
(b) (I), (II) and (IV)
(c) (I) and (III)
(d) (I), (III) and (IV)
Answer:

Acids Bases And Salts MCQ Question 10.
To protect against tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:
(a) Acidic
(b) Neutral
(c) Basic
(d) Corrosive
Answer:
(c) Basic

Explanation: The toothpaste commonly used is alkaline or basic in nature as they contain mild bases such as sodium fluoride or sodium bicarbonate in their composition.

The base reacts with the acid formed during bacterial action in the mouth and neutralises its bad effects. Thus, preventing tooth decay. So, they can neutralize the effect of extra acids being formed in the mouth cavity which are mainly responsible for tooth decay.

Related Theory
When we eat sweet things, the pH of our mouth falls below 5.5 (moderately acidic) as the oral bacteria release acid while acting on sugars present in our food. The acidic conditions are capable of corroding the enamel which is made up of calcium phosphate. This causes the tooth to decay.

MCQ Questions For Class 10 Science Chapter 2 Question 11.
Match the chemical substances given in Column I with their appropriate application given in Column II:

Column I	Column II
(A) Bleaching Powder	(1) Preparation of glass
(B) Baking Soda	(2) Production of H2 and Cl2
(C) Washing Soda	(3) Decolourisation
(D) Sodium Chloride	(4) Antacid

Answer:

Chapter 2 Science Class 10 MCQ Question 12.
Which of the following phenomena occur, when a small amount of acid is added to water?
(I) Ionisation
(II) Neutralisation
(III) Dilution
(IV)Salt formation
(a) (I) and (II)
(c) (II) and (III)
(b) (I) and (III)
(d) (II) and (IV)
Answer:

Class 10 Chemistry Chapter 2 MCQ Question 10.
To protect against tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:
(a) Acidic
(b) Neutral
(c) Basic
(d) Corrosive
Answer:
(c) Basic

Explanation: The toothpaste commonly used is alkaline or basic in nature as they contain

Class 10 Acid Base And Salt MCQ Question 13.
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue:
(a) Lemon juice
(b) Vinegar
(c) Common salt
(d) An antacid
Answer:
(d) An antacid

Explanation: pH paper gives greenish-blue colour in a weak alkaline medium so antacid [Mg(OH)₂] which is an alkaline compound will show greenish-blue color on pH paper.

Related Theory
Lemon fruit contains citric acid, vinegar has acetic acid and common salt is the neutral salt the clear super natant solution turns the pH paper yellowish-orange means the given sample of soil is acidic so it can be neutralised by base/alkaline solution.

MCQ On Acids Bases And Salts Class 10 Question 14.
Which of the following is not a mineral acid?
(a) Hydrochloric acid
(b) Citric acid
(c) Sulphuric acid
(d) Nitric acid
Answer:

Class 10 Chapter 2 Science MCQ Question 15.
Which of the following is/are true when HCl_(g) is passed through water?
(I) It does not ionise in the solution as it is a covalent compound.
(II) It ionises in the solution.
(III) It gives both hydrogen and hydroxyl ions in the solution.
(IV) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.
(a) Only (I)
(b) Only (III)
(c) (II) and (IV)
(d) (III) and (IV)
Answer:
(c) (II) and (IV)

Explanation: HCl, is a polar covalent compound, easily ionises in water to form hydronium (H₃O⁺) and chloride ions (Cl^–). HCl (a strong acid) ionises completely in water to produce H⁺ and Cl^– ions. H⁺ ion combines with water molecules to produce hydronium ions.

Question 16.
Which among the following is not a base?
(a) NaOH
(b) KOH
(c) NH₄OH
(d) C₂H₅OH
Answer:
(d) C₂HsOH
Explanation: C₂H₅OH is not a base. C₂H₅OH is an organic compound with -OH functional group that is known as alcohol. It cannot give OH^– ions in its solution. It cannot dissociate ions in a solution. Thus, it cannot be a basic compound.

Question 17.
Identify the correct representation of reaction occurring during the chloralkali process.
(a) 2NaCl_(l) + 2H₂O_(l) → 2NaOH_(l) + Cl_2(g) + H_2(g)
(b) 2NaCl_(l) + 2H₂O_(aq) → 2NaOH_(aq) + Cl_2(g) + H_2(aq)
(c) 2NaCl_(aq) + 2H₂O_(l) → 2NaOH_(aq) + Cl_2(aq) + H_2(aq)
(d) 2NaCl_(aq) + 2H₂O_(l) → 2NaOH_(aq) + Cl_2(g) + H_2(g)
Answer:

Question 18.
Which of the following statements is true for acids?
(a) Bitter and change red litmus to blue.
(b) Sour and change red litmus to blue.
(c) Sour and change blue litmus to red.
(d) Bitter and change blue litmus to red.

Question 19.
Zinc granules on treating with an acid X, form zinc sulphate (ZnSO₄) salt along with the evolution of a gas Y, which burns with a pop sound when brought near to a burning candle. Identify acid X and gas evolved Y.
(a) X-sulphuric acid and Y-oxygen gas
(b) X-hydrochloric acid and Y-oxygen gas
(c) X-sulphuric acid and Y-hydrogen gas
(d) X-hydrochloric acid and Y-hydrogen gas [Diksha]
Answer:
(c) X-sulphuric acid and Y-hydrogen gas

Explanation: When an acid reacts with a metal, hydrogen gas is liberated. In the given reaction, when dilute sulphuric acid reacts with zinc granules, hydrogen gas is liberated and zinc sulphate solution is formed:

The presence of hydrogen gas is tested by bringing a lighted candle near it. When a lighted candle is brought near the test tube containing hydrogen gas, it burns with a ‘pop’ sound making a little explosion.

Hence, acid X is sulphuric acid and gas Y is hydrogen gas.

Question 20.
Which of the following solutions in water does not conduct electricity?
(a) Hydrochloric acid
(b) Sodium chloride
(c) Glucose
(d) Sulphuric acid [Diksha]
Answer:
(c) Glucose

Explanation: The aqueous solution of an acid conducts electricity because of the presence of charged particles called ‘ions’ in it. When hydrochloric acid (HCl) is dissolved in water, its aqueous solution contains hydrogen ions (H⁺) and chloride ions (Cl^–). These ions carry electric currents. So, due to the presence of H⁺ and Cl^– ions, a solution of hydrochloric acid conducts electricity.

On the other hand, the hydrogen-containing compound such as glucose is not categorized as acid because it does not produce hydrogen ions or some other ions when dissolved in water and hence does not conduct electricity. Therefore, the answer is glucose.

Question 21.
Which of the following will turn phenolphthalein pink?
(a) NaOH_(aq)
(b) HCl_(aq)
(c) CH₃COOH_(aq)
(d) H₂O
Answer:

Question 22.
Which one of the following is not a use of washing soda:
(a) Sodium carbonate (washing soda) is used in glass, soap and paper industries.
(b) It is used in the manufacture of sodium compounds such as borax.
(c) Sodium carbonate can be used as a clean¬ing agent for domestic purposes.
(d) It is used for disinfecting water.
Answer:
(d) It is used for disinfecting water.

Explanation: The compound that is used for disinfecting water is bleaching powder. How¬ever, washing soda is used for removing the permanent hardness of water.

Question 23.
The approximate pH values of four salts is given below. Select the row(s) containing the correct information.

Name of Salt	PH
(I) Potassium Sulphate	10
(II) Ammonium nitrate	5
(III) Sodium acetate	3
(IV) Sodium hydrogen carbonate	8

(a) Both (I) and (II)
(b) Both (II) and (III)
(c) Both (III) and (IV)
(d) Both (II) and (IV)
Answer:

Question 24.
Zinc granules on treating with a substance X, form a salt sodium zincate along with the evolution of a gas Y which burns with a pop sound when brought near a burning candle. Identify the substance X and gas evolved Y.

X	Y
(a) Acetic acid	Hydrogen
(b) Sodium hydroxide	Hydrogen
(c) Sodium hydroxide	Oxygen
(d) Zinc hydroxide	Hydrogen

Answer:
(b) X is Sodium hydroxide and Y is hydrogen.

Explanation: When zinc granules react with sodium hydroxide, salt sodium zincate is formed along with hydrogen gas, which burns with a pop sound.

The equation of the reaction taking place is:
2NaOH_(aq) + Zn(s) → Na₂ZnO_2(aq) + H_2(g)

Question 25.
Which of the following salts belong to the same family of salts?
(I) sodium chloride and sodium acetate
(II) calcium sulphate, magnesium sulphate
(III) sodium carbonate and sodium hydrogen -carbonate
(IV) sodium chloride and magnesium sulphate
(a) Both (I) and (II)
(b) Both (I) and (III)
(c) (I), (II) and (III)
(d) (I), (III) and (IV)
Answer:

Question 26.
A student noted his observations regarding the acidic or basic nature of salts as below:
(I) Sodium chloride is a neutral salt
(II) Ammonium chloride is a basic salt
(III) Sodium carbonate is a neutral salt
(IV) Copper sulphate is an acidic salt Select the incorrect observations:
(a) Both (I) and (III)
(b) Both (II) and (III)
(c) Both (I) and (IV)
(d) Both (II) and (IV)
Answer:
(b) Both (II) and (III)

Explanation: The salts of strong acids and strong bases give neutral solutions. Therefore, sodium chloride is a neutral salt as it is obtained from sodium hydroxide (a strong base) and hydrochloric acid (a strong acid).

The salts of strong acids and weak bases give acidic solutions. Therefore, ammonium chloride and copper sulphate are acidic salts as ammonium chloride is obtained from ammonium hydroxide (a weak base) and hydrochloric acid (a strong acid), and copper sulphate is obtained from copper hydroxide (a weak base) and sulphuric acid (a strong acid).

The salts of weak acids and strong bases give basic solutions. Therefore, sodium carbonate is a basic salt as it is obtained from carbonic acid (a weak acid) and sodium hydroxide(a strong base).

Assertion Reasoning questions Class 10 Science Chapter 2

For the following questions, two statements are given – one labelled Assertion (A) and the other labeled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
(a) Both (A) and (R) are true and (R) is the correct explanation of the (A).
(b) Both (A) and (R) are true, but (R) is not the correct explanation of the (A).
(c) (A) is true, but (R) is false.
(d) (A) is false, but (R) is true.

Question 27.
Assertion,(A): HCl gas does not change the colour of dry blue litmus paper.
Reason (R): Acids always produce hydrogen ions.
Answer:
(b) Both (A) and (R) are true, but (R) is not the correct explanation of the (A).

Explanation: HCl gas does not change the colour of dry litmus paper but changes colour of moist litmus paper as acids produce hydrogen ions only in solution.

Question 28.
Assertion (A): Generally, the colour of indicators changes in a particular pH range.
Reason (R): Indicators are weak acids or weak base and exhibit different colours in molecular form and ionic form.
Answer:
(a) (A) and (R) are true and (R) is the correct explanation of the (A).

Explanation: Since indicators are weak acids or weak bases, their percentage of existence in molecular state and in ionized state depends on the strength of acidic/basic/neutral solution to which they are added. Hence their colours change at a particular pH range.

Question 29.
Assertion (A): Zinc reacts with sodium hydroxide solution and hydrogen gas is evolved.
Reason (R): All metals react with bases to evolve hydrogen gas.

Question 30.
Assertion (A): While diluting an acid, water is slowly added to acid with constant stirring.
Reason (R): The process of dissolving an acid in water is a highly exothermic reaction.

Question 31.
Assertion (A): Metal oxides are acidic in nature.
Reason (R): Calcium hydroxide reacts with carbon dioxide to form a salt and water.
Answer:
(d) (A) is false, but (R) is true.

Explanation: The reaction of calcium hydroxide with carbon dioxide to form a salt and water is similar to the reaction between an acid and a base. Therefore, non-metal oxides are acidic in nature.

Question 32.
Assertion (A): When copper sulphate crystals are heated in a dry boiling tube, they turn white.
Reason (R): Water of crystallization is the number of water molecules present in one formula unit of a salt.
Answer:
(b) Both (A) and (R) are true but (R) is not the correct explanation of (A).

Explanation: Copper sulphate crystals that seem to be dry contain water of crystallisation. When we heat the crystals, this water is removed and the salt turns white.
CUSO₄.5H₂O → CuSO₄ + 5H₂O

Question 33.
Assertion (A): When copper oxide is added to dilute hydrochloric acid, the colour of the solution becomes blue-green.
Reason (R): Copper (II) chloride is formed.
Answer:
(a) (A) and (R) are true and (R) is the correct explanation of the (A).

Explanation: When copper oxide is added to dilute hydrochloric acid, the colour of the solution becomes blue-green due to the formation of Copper (II) chloride, which is blue-green in colour.

(Competency Based Questions (CBQs))

Question 1.
A chemistry student pLaced a strip of blue litmus paper and a strip of red litmus paper in a glass dish. Then she added a drop of dilute sulphuric acid to each strip of litmus paper. She observed that the blue litmus paper turned red, but the red litmus paper did not change color. Next, she placed a drop of sodium hydroxide (NaOH) on other strips of blue and red litmus paper. This time, the red litmus paper turned blue, but the blue litmus paper did not change. Finally, she put a drop of distilled water on strips of blue and red litmus paper. Neither strip changed color. She repeated the tests several times with the same results. The student concluded that acids turn blue litmus paper red; bases, such as sodium hydroxide, turn red litmus paper blue. As water did not affect either red or blue litmus paper, she reasoned that water was not an acid or a base, but a neutral substance.

Keeping these results in mind, the student poured a little sodium hydroxide into a beaker containing red and blue litmus paper. Then she added hydrochloric acid (HCl) drop by drop until the solution became neutral. She determined that a new, neutral substance had formed in the beaker. The substance was table salt, or sodium chloride (NaCl), which is one of many salts formed from an acid and a base.
(A) If a drop of an unknown substance turns blue litmus paper red, but does not change red litmus paper, what will be the substance – an acid or a base?
Answer:

(B) When strips of blue and red litmus paper are put in a beaker filled with a clear solution, neither litmus paper changes colour. What can you say about the solution?
Answer:
The solution must be neutral.

(C) Based on the results of this experiment, when would salt be formed?
Answer:

(D) What happens when nitric acid is added to egg shell?
Answer:
Calcium carbonate is main component of egg shell so when we add nitric acid to egg shell, it reacts with calcium carbonate to form soluble calcium nitrate and water with brisk effervescence of carbon dioxide gas.
CaCO₃(s) + 2HNO₃(aq) → Ca(NO₃)₂(aq) + CO₂(g) + H₂O

Question 2.
When we smile, our teeth become visible. So, we should ensure that we have a beautiful set of teeth as it makes our smile even more beautiful! Tooth enamel is the thin outer covering of the tooth. This tough shell is the hardest tissue in the human body. Enamel covers the crown which is the part of the tooth that’s visible outside of the gums.

Calcium phosphate is present in tooth enamel. Its nature is:
(a) Basic
(b) Acidic
(c) Neutral
(d) Amphoteric
Answer:
(a) Basic

Explanation: Calcium phosphate Ca₃(PO₄)₂ is a basic salt, as it is formed by the combination of a weak acid (phosphoric acid) and a slightly stronger base (calcium hydroxide).

Question 3.
Patrick read about an industrial process for the electrolysis of sodium chloride solutions.
It is the technology used to produce chlorine and sodium hydroxide which are commodity chemicals required by industry. 35 million tons of chlorine were prepared by this process in 1987. Industrial-scale production began in 1892. Usually, the process is conducted on a brine (an aqueous solution of NaCl), in which case NaOH, hydrogen, and chlorine are formed. When using calcium chloride or potassium chloride, the products contain calcium or potassium instead of sodium. Related processes are known that use molten NaCl to give chlorine and sodium metal or condensed hydrogen chloride to give hydrogen and chlorine.
(A) Name the process referred to in the above passage.
Answer:
The process referred to in the passage is chlor-alkali process because of the products formed – chlor for chlorine and alkali for sodium hydroxide.

(B) Where are the products of the above process produced?
Answer:

(C) Write the chemical equation for the reaction taking place in the process.
Answer:
The chemical equation for the reaction taking place is:
2NaCl(aq) + 2H₂O → 2NaOH(aq) + Cl₂(g) + H₂(g)

(D) How is bleaching powder prepared from one of the products formed in this industrial process?
Answer:

Question 4.
Neetu’s friend suffered a fracture in her foot while riding her bicycle. She had to be admitted to the nursing home and the doctor plastered her foot.

The chemical formula for Plaster of Paris is:
(a) CaSO₄.2H₂O
(b) CaSO₄.H₂O
(c) CaSO₄.\(\frac{1}{2}\)H₂O
(d) 2CaSO₄.H₂O
Answer:
(c) CaSO₄. \(\frac{1}{2}\) H₂O

Explanation: Chemical name of Plaster of Paris is calcium sulphate hemihydrate. It is written in this form because two formula units of CaSO₄ share one molecule of water.

Related Theory
When gypsum is heated at 373K, it loses water molecules.

It is a white powder used by doctors for supporting fractured bones. It is also used for making toys, materials for decoration and for making surfaces smooth.

Question 5.
Sabina studied in history about Mahatma Gandhi’s Dandi March and came to know that sodium chloride was an important symbol in our struggle for freedom. She started exploring from the internet as she was anxious to know what all we can do with this salt other than using it as a table salt to make food tasty. Table salt is also used to preserve food, facilitates transport of nutrients and oxygen and is used as raw material to form various salts.

Based on the understanding of the given passage and the related studied concepts, answer the following questions:
(A) Name two salts of daily use for which common salt (sodium chloride) is the raw material.
(B) Draw a diagram of chloralkali process and write its equation.
Answer:

Question 6.
While performing experiments in chemistry lab, one should always wear a laboratory coat and be very careful while performing experiments. Some students have the bad habit of creating nuisance for other students which distracts the students and may cause serious accidents such as spilling of acid or can cause burn injuries.

If a few drops of concentrated acid accidentally spills over the hand of a student, what should be done?
(a) Wash the hand with a saline solution
(b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate
(c) After washing with plenty of water, apply a solution of sodium hydroxide on the hand
(d) Neutralise the acid with a strong alkali
Answer:
(b) Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate

Explanation: In such an accident, washing the hands with water will dilute the acid and wash it out. Any remaining acid will be neutralized with sodium hydrogen carbonate (baking soda) as it is a base. This will minimize the effect of damage caused by acid to the skin.

Remember, too strong a base (like NaOH) can be corrosive.

Question 7.
Take about 2 mL of dilute NaOH solution in a test tube and a small amount of copper oxide in a beaker. Add two drops of phenolphthalein solution in the test tube. Add dilute HCl solution in both the test tube and the beaker drop by drop while stirring. Now add a few drops of NaOH to the mixture in the test tube.
(A) When two drops of phenolphthalein solution are added to the test tube,
(a) The solution turns pink in colour
(b) The solution turns colourless
(c) The solution turns red
(d) The solution turns yellow
Answer:
(a) The solution turns pink in colour

Explanation: Phenolphthalein is a colourless reagent which is used as an indicator as it changes the colour to pink in a basic solution. As dilute NaOH is a basic solution, its colour changes to pink on adding a few drops of phenolphthalein solution.

(B) @Four students recorded their observations on adding dilute HCL to the beaker containing copper oxide. Select the correct observation:

Student Observation-I	Observation-II
(a) Solution becomes colourless	Copper oxide dissolves
(b) Solution becomes blue-green in colour	Copper oxide dissolves
(c) Solution becomes blue green in colour	Copper oxide is formed as a precipitate
(d) Solution becomes colourless	Copper chloride solution is colourless

Answer:

(C) Select the correct observation(s):
When dilute HCl solution is added to the test tube drop by drop (after adding two drops of phenolphthalein solution) and then a few drops of NaOH solution are added to this mixture:
(I) The solution turns coLourless on adding dilute HCl
(II) The solution turns pink on adding dilute HCl
(III) The solution turns colourless again on adding NaOH to the mixture.
(IV) The solution turns pink again on adding NaOH to the mixture
(a) Both (I) and (III)
(b) Both (II) and (III)
(c) Both (I) and (IV)
(d) Both (II) and (IV)
Answer:

(D) Identify the option that correctly describes the products formed in the test tube and beaker on adding dilute HCl:

Test Tube	Beaker
(a) Sodium chloride + hydrogen	Copper chloride + hydrogen
(b) Sodium chloride + water	Copper chloride + hydrogen
(C) Sodium chloride + hydrogen	Copper chloride + water
(d) Sodium chloride + water	Copper chloride + water

Answer:
(d) Test Tube: Sodium chloride + water; Beaker: Copper chloride + water

Explanation: The products formed in the test is sodium chloride and water and that in beaker is copper chloride and water.

When sodium hydroxide reacts with dilute hydrochloric acid, it forms sodium chloride and water:
When copper oxide reacts with HCl, it forms copper chloride and water:
CuO(s) + 2HCl(aq) → CuCl₂(aq) + H₂O(l)

(E) Select the incorrect statement(s):
(I) Reaction of sodium hydroxide with dilute hydrochloric acid is a displacement reaction.
(II) Reaction of copper oxide with dilute hydrochloric acid is a double displacement reaction.
(III) Reaction of sodium hydroxide with dilute hydrochloric acid is a neutralization reaction.
(IV) Reaction of copper oxide with dilute hydrochloric acid is a neutralization reaction.
(a) Only (I)
(b) Only (II)
(c) Both (I) and (IV)
(d) Both (II) and (III)
Answer:
(a) Only (I)

Explanation: Reaction of sodium hydroxide with dilute hydrochloric acid is a neutralization reaction which is also a double displacement reaction as products are formed by the exchange of ions between the reactants.

Similarly, the reaction of copper oxide with dilute hydrochloric acid is also a neutralization reaction which is also a double displacement reaction.

Whereas in a displacement reaction, a more reactive substance displaces a less reactive substance from its compound as in the reaction between a metal such as zinc and dilute hydrochloric acid.

Question 8.
Sumit along with his friend went to a nearby shopping mall. They were standing under a tree when an ant stung his friend on his hands due to which his friend’s hand was painting a lot.

Name the acid along with its chemical formula present in ant sting.
Answer:
The acid present in ant sting is methanoic acid (formic acid). The chemical formula is HCOOH. Explanation: When an ant stings, it leaves formic acid (Methanoic acid) which causes pain and irritation. To get relief from the sting, mild base like baking soda can be applied on the stung.

Question 9.
Take about 1g solid NaCl in a clean and dry test tube and set up the apparatus as shown in Figure.

Add some concentrated sulphuric acid to the test tube.
(A) The gas produced in the test tube is:
(a) Hydrogen
(b) Hydrogen chloride
(c) Hydrogen sulphide
(d) Sulphur dioxide
Answer:
(b) Hydrogen chioride
Explanation: When concentrated sulphuric acid is added to sodium chloride, the following reaction takes place:

2NaCl+ H₂SO₄→ Na₂SO₄ + 2HCl

(B) A student tested the gas coming out of the delivery tube first with dry blue litmus paper and then with wet litmus paper and noted down the following observations. Select the correct observation:

Dry Blue Litmus Paper	Wet Blue Litmus Paper
(a) No change	Turns red
(b) Turns red	No change
(c) Turns red	Turns red
(d) No change	No change

Answer:

(C) If climate is humid, the gas evolved is passed through a guard tube containing:
(a) Calcium hydroxide
(b) Calcium carbonate
(c) Calcium sulphate
(d) Calcium chloride
Answer:
(d) Calcium chloride

Explanation: During the preparation of hydrogen chloride gas, the gas is usually passed through the guard tube containing calcium chloride during humid climate, as calcium chloride is a good drying agent and absorbs moisture from the gas.

(D) Select the incorrect statement(s):
(I) Hydrogen ions in HCl are produced even in absence of water.
(II) Hydrogen ions can exist alone.
(III) Hydrogen ions exist after combining with water molecules.
(IV) Hydrogen ions in HCl are produced only in presence of water
(a) Only (I)
(b) Both (I) and (II)
(c) Both (I) and (III)
(d) Both (II) and (IV)
Answer:
(b) Both (I) and (II)
Explanation: The separation of H⁺ ions from HCl molecules cannot occur in the absence of water.
HCl +H₂O → H₃O⁺ + Cl^–
Hydrogen ions cannot exist alone, but they exist after combining with water molecules. Thus hydrogen ions must always be shown as H⁺(aq) or hydronium ion (H30⁺).
H⁺ + H₂O → H₃O⁺

(E) Hydrogen ions must always be shown as H⁺(aq) or hydronium ion (H₃0⁺) as:
(a) Hydrogen ions combine with water to form hydronium ions
(b) Hydrogen gas dissociates into ions.
(c) All acids dissociate into hydrogen ions in presence of a base.
(d) Hydrogen ions separate from acids on passing electricity.
Answer:

Question 10.
Acids and bases represent two important classes of chemical compounds. In every day life, acids and bases play a role in everything from the digestion of the foods you eat to the function of the medicine you take and even the cleaning products you use. Without acids and bases, many of the products in your home today would not have much use. Acids and bases are also important in atmospheric, geological, and physiological processes because they have unique chemical properties. Acids and bases have unique chemical properties because of the atomic composition of these compounds and how these compounds interact with other atoms and molecules.
The pH of some common substances is shown below:
(A) The nature of calcium phosphate present in tooth enamel is:
(a) Basic
(b) Amphoteric
(c) Acidic
(d) Neutral
Answer:

(B) What is the pH value of saliva after meal?
(a) between 0 and 4
(b) between 4 and 5
(c) between 5 and 6
(d) between 6 and 7
Answer:
(c) between 5 and 6

Explanation: The pH of saliva after meals is around 5.8 due to the increased activity of bacteria on the food that we eat.

(C) Given below are four statements. Select the incorrect statement(s):
(I) Pain and irritation during indigestion is due to the excess acid produced by the stomach.
(II) People use antacids to get rid of this pain which are bases.
(III) Milk of magnesia is an antacid as it is a mild acid.
(IV) Antacids neutralize the excess acid produced in the stomach.
(a) Only (I)
(b) Only (II)
(c) Only (III)
(d) (III) and (IV)
Answer:
(c) Only (III)

Explanation: Antacids are bases which help in getting rid of the pain and irritation during indigestion by neutralizing the excess acid produced in the stomach. Milk of magnesia or magnesium hydroxide is a mild base that is used as an antacid.

(D) The pH level of the human body is:
(a) Less than 7, acidic
(b) Equal to 7, Neutral
(c) More than 7, basic
(d) None of the above
Answer:

(E) A student tabulated the naturally occurring acidic substances and the acid contained in them.

Natural Source	Acid found
(I) Vinegar	Methanoic acid
(II) Nettle sting	Acetic acid
(III) Tomato	Oxalic acid
(IV) Orange	Citric acid

Select the option containing the correct acid found in them:
(a) Both (I) and (II)
(b) Both (III) and (IV)
(c) Both (II) and (IV)
(d) Both (I) and (III)
Answer:
(b) Both (III) and (IV)

Explanation: Vinegar contains acetic acid, whereas nettle sting contains methanoic acid.

Question 11.
If you think the best way to put out a fire is by dousing it with water, you’d be surprised to know you’re wrong. As it turns out, not all fires are created equal, and there is more than one way to extinguish them safely. There are situations where you should not use water to deal with a fire at all. For example, an electrical fire.

Name the chemicals used in acid fire extinguishers and the gas that evolved from it when it is used?
Answer:
The chemicals used in soda acid fire extinguishers are sodium hydrogen carbonate and sulphuric acid.
The gas evolved when the two reactants react is carbon dioxide which is used for extinguishing electrical fires.
The reaction taking place between the two chemicals is
2NaHCO₃ + H₂SO₄ → Na₂SO₄ + 2CO₂ + 2H₂O

Question 12.
The reaction between MnO₂ with HCl is depicted in the following diagram. It was observed that a gas with bleaching abilities was released.

(A) The chemical reaction between MnO₂ and HCl is an example of:
(a) displacement reaction
(b) combination reaction
(c) redox reaction
(d) decomposition reaction.
Answer:
(c) redox reaction

Explanation: When MnO₂ reacts with HCl, the following reaction takes place in which chlorine gas is also evolved, which has bleaching properties.
MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O

In this reaction, Hydrochloric acid is oxidized to chlorine and Manganese dioxide is reduced to manganese dichloride. As both oxidation and reduction are taking place in this reaction, it is a redox reaction.

(B) Chlorine gas reacts with ……………… to form bleaching powder.
(a) dry Ca(OH)₂
(b) dil. solution of Ca(OH)₂
(c) cone, solution of Ca(OH)₂
(d) dry CaO
Answer:
(a) dry Ca(OH)₂
Explanation: Bleaching powder is produced by the action of chlorine on dry slaked lime [Ca(OH)2],
Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

(C) Identify the correct statement from the following:
(a) MnO₂ is getting reduced whereas HCl is getting oxidized
(b) MnO₂ is getting oxidized whereas HCl is getting reduced.
(c) MnO₂ and HCl both are getting reduced.
(d) MnO₂ and HCl both are getting oxidized.
Answer:
(a) Mn02 is getting reduced whereas HCl is getting oxidized.
Explanation: In the reaction between
MnO₂ and HCl, MnO₂ is getting reduced to manganese dichloride as it is losing oxygen atoms. Whereas, HCl is getting oxidized to chlorine by the removal of oxygen.

Related Theory
Oxidation is the addition of oxygen to a substance or the removal of hydrogen from a substance.
Reduction is the addition of hydrogen to a substance or removal of oxygen from a substance.
The oxidising agent is the substance that provides oxygen for oxidation or which removes hydrogen.
Reducing agent is the substance which provides hydrogen for reduction or which removes oxygen.

(D) In the above-discussed reaction, what is the nature of MnO₂?
(a) Acidic oxide
(b) Basic oxide
(c) Neutral oxide
(d) Amphoteric oxide
Answer:
(b) Basic oxide
Explanation: As MnO₂ reacts with HCl to form salt, water and chlorine gas, it is a basic oxide since it reacts with an acid. Moreover, oxides of metals are basic in nature whereas oxides of non-metals are acidic in nature.

(E) What will happen if we take dry HCl gas instead of aqueous solution of HCl?
(a) Reaction will occur faster.
(b) Reaction will not occur.
(c) Reaction rate will be slow
(d) Reaction rate will remain the same.
Answer:
(b) Reaction wiil not occur

Explanation: A substance shows its acidic properties only in presence of water as it is able to dissociate into H+ ions, which is responsible for its acidic properties.

So, if we use dry HCl, then no reaction will take place as HCl will not be able to dissociate into ion$ as shown by the following reaction:
HCl + H₂O H₃O⁺ + Cl^–

Question 13.
Frothing in Yamuna:
The primary reason behind the formation of the toxic foam is high phosphate content in the wastewater because of detergents used in dyeing industries, dhobi ghats and households. Yamuna’s pollution level is so bad that parts of it have been labelled ‘dead’ as there is no oxygen in it for aquatic life to survive.

(A) Predict the pH value of the water of river Yamuna if the reason for froth is high content of detergents dissolved in it.
(a) 10-11
(b) 5-7
(c) 2-5
(d) 7
Answer:
(a) 10-11

Explanation: Detergents are basic in nature having pH value of 10-11. As the froth has a high content of detergents dissolved in it, the pH value of water of river Yamuna will be 10 -11.

(B) Which of the following statements is correct for the water with detergents dissolved in it?
(a) low concentration of hydroxide ion (OH^–)and high concentration of hydronium ion (H₃O⁺)
(b) high concentration of hydroxide ion (OH^–) and low concentration of hydronium ion (H₃O⁺)
(c) high concentration of hydroxide ion (OH^–) as well as hydronium ion (H₃O⁺)
(d) equal concentration of both hydroxide ion (OH^–) and hydronium ion (H₃O⁺).
Answer:
(b) high concentration of hydroxide ion (OH^–) and low concentration of hydronium ion (H₃O⁺)

Explanation: As detergents are basic in nature, the concentration of hydroxide ions will be high and the concentration of hydronium ions will be less.

Related Theory
When bases are dissolved in water, they dissociate into hydroxide ions.
For example, NaOH(aq) → Na⁺(aq) + CH^–(aq)
KOH(aq) → K⁺(aq) + OH^–(aq)

(C) The table provides the pH value of four solutions P, Q, R and S

Solution	PH Value
P	2
Q	9
R	5
S	11

Which of the following correctly represents the solutions in increasing order of their hydronium ion concentration?
(a) P > Q > R> S
(b) P > S > Q > R
(c) S < Q < R< P
(d) S < P < Q < R
Answer:
(c) S < Q < R. < P

Explanation: The pH of a substance is related to the concentration of hydrogen or hydronium ions. An acid has a high concentration of hydronium ions and a low pH value whereas a base has a high pH value and a low concentration of hydronium ions.

So, we can say, lower the pH value, the more is the concentration of hydronium ions. Therefore, the hydronium ion concentration is least in S, followed by Q, R and then P which has the maximum concentration of hydronium ions.

(D) High content of phosphate ion in river Yamuna may lead to:
(a) decreased level of dissolved oxygen and increased growth of algae
(b) decreased level of dissolved oxygen and no effect of the growth of algae
(c) increased level of dissolved oxygen and increased growth of algae
(d) decreased level of dissolved oxygen and decreased growth of algae
Answer:
(a) decreased level of dissolved oxygen and increased growth of algae

Explanation: When the amount of phosphate ions in water increases, it leads to decreased level of dissolved oxygen which is harmful for the aquatic organisms. This leads to an increased growth of algae due to presence of nutrients.

Related Theory
Eutrophication is the process in which a water body becomes overly enriched with nutrients, leading to plentiful growth of simple plant life. The excessive growth (or bloom) of algae and plankton in a water body are indicators of this process.

(E) If a sample of water containing detergents is provided to you, which of the following methods will you adopt to neutralize it?
(a) Treating the water with baking soda
(b) Treating the water with vinegar
(c) Treating the water with caustic soda
(d) Treating the water with washing soda
Answer:
(b) Treating the water with vinegar

Explanation: As detergents are basic in nature, an acid will neutralize it. Out of the substances mentioned, only vinegar is acidic, as it is 5 – 8% solution of ethanoic acid in water.

Very Short Answer Type Questions

Question 1.
What types of ions are formed: (a) when an acid is dissolved in water (b) when a base is dissolved in water?
Answer:

Question 2.
‘A’ is a soluble acidic oxide and ‘B’ is a soluble base. Compared to pH of pure water, what will be the pH of (a) solution of A (b) solution of B?
Answer:
pH of pure water is 7. As A is a soluble acid, its pH will be less than that of pure water whereas pH of B will be more than that of pure water as it is a soluble base.

Question 3.
When electricity is passed through a common salt solution, sodium hydroxide is produced along with the liberation of two gases “X” and “Y”. “X” burns with a pop sound whereas “Y” is used for disinfecting drinking water. Identify X and Y.
Answer:
The reaction is chlor-alkali process. As X burns with a pop sound, X is hydrogen gas. Y is chlorine gas which is used for disinfecting drinking water.

Question 4.
Which bases are called alkalis? Give one example of alkali.
Answer:
The bases that are soluble in water are called alkalies. One example of an alkali is sodium hydroxide, NaOH.

Question 5.
Name the acid and base that have com stituted the salt ammonium nitrate
Answer:

Question 6.
Oxides of metals are basic while those of non-metals are acidle, Explain.
Answer:
Oxides of metals are basic as they react with acids to produce salt and water.
CuO + 2HCl → CuCl₂ + H₂O
Oxides of non-metals are acidic as they react with bases to produce salt and water.
CO₂ + Ca(OH)₂ → CaCO₃ + H₂O

Question 7.
Write a balanced chemical eauatin for the renction between sodium carbonals and hydrochloric acid indicating the physical state of reactions and the products.
Answer:
The balanced equation for the reaction between sodium carbonate and hydrochloric acid is given below:
Na₂CO₃(s) + 2HCl(aq) → 2NaCl(aq) + H₂O(l) + CO₂(g)

Question 8.
Give reasons for the following:
(A) Only one half of water molecule is shown in the formula of Plaster of Paris.
(B) Sodium hydrogen carbonates is used as an antacid.
(C) On strong heating, blue coloured copper sulphate crystals turn white.
Answer:

Question 9.
A student prepared solutions of (I) an acid and (II) a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. Since, both the solutions are colourless, how will she distinguish between the two?
Answer:
In the absence of litmus, other natural or synthetic substances can be used to test acid and bases. Such substances are called indicators. Indicators such as methyl orange and phenolphthalein can be used to test the nature of a solution.

These indicators show change in their colour in acidic, neutral and basic solutions. We can also use natural indicators such as turmeric and grape juice. A few indicators with characteristic colour change are shown below:

Question 10.
Fill in the missing data in the given table.


Answer:

1. Acid: HCl
NH₄OH + HCl → NH₄Cl + H₂O

2. Formula: CuSO₄ and base: Cu(OH)₂
H₂SO₄ + Cu(OH)₂ → CuSO₄ + 2H₂O

3. Acid: HCl
NaOH + HCl → NaCl + H₂O

4. Base: Mg(OH)₂
Mg(OH)₂ + 2HNO₃ → Mg(NO₃)₂ + 2H₂O

5. Base: KOH and Acid: H₂SO₄
2KOH + H2SO₄ → K2SO₄ + 2H₂O

6. Acid: HNO₃
Ca(OH)₂ + 2HNO₃ → Ca(NO₃)₂ + 2H₂O

Question 11.
How is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt. Name the type of hardness of water that can be removed by it?
Answer:

Question 12.
(A) You are given two solutions A and B and their pH is 6 and 8 respectively. Answer the following:
(i) Which of the two solutions have more hydrogen ion concentration?
(ii) Which is acidic and which is basic?
Answer:
pH of solution A = 6 pH of solution B = 8
(i) Solution A will have a higher hydrogen ion concentration. Explanation: We know that the pH of any solution is inversely proportional to the hydrogen ion concentration. This means that the solution that has lower pH number will have the higher hydrogen ion concentration.

(ii) Also solution A is acidic and solution B is basic because H+ ion concentration is higher in acidic solution.

(B) What is dilution?
Answer:
Mixing an acid or base with water results in decrease in concentration of ions (H₃O⁺/ OH^–) per unit volume. Such process is called dilution and the acid or base is said to be dituted. The process of dissolving an acid or a base in water is a highly exothermic reaction.

Question 13.
Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH₃COOH) is added to test tube B. In which test tube will the fizzing occur more vigorously and why?
Answer:

Question 14.
Crystals of a substance changes their color on heating in a closed vessel but regained it after sometime, when they were allowed to cool down.
(A) Name one such substance.
Answer:
One such substance whose crystals changes its colour from blue to white on heating in a closed vessel for some time is hydrated copper sulphate, CuSO₄.5H₂O.

(B) Explaain the phenomenon involved.
Answer:
Hydrated salts contain molecules of water known as water of crystallization. When such crystals are heated in a closed container, they lose their water of crystallization and hence change of colour is observed.

Related Theory:
When a salt which has lost its water of crystallization due to heating is left to cool down, it absorbs moisture from air and regains its water of crystallisation and thus, also its color.

Question 15.
The pH of the mouth of a person is lower than 5.5. What changes will occur in EMB his mouth? How these changes can be controlled? Write any two measures.
Answer:
When the pH of the mouth of a person is lower than 5.5, the acid produced by the action of bacteria on sugar and food particles in mouth corrodes even the tooth enamel which is made up of calcium phosphate. This leads to dental caries and tooth decay.

These changes can be controlled by the following measures:

1. By using tooth pastes, which are generally basic in nature, as they can neutralize the excess acid produced in the mouth and hence help in preventing tooth decay.
2. By regular brushing of teeth twice a day and especially after eating sweets and chocolates.

MCQ Questions for Class 10 Science with Answers

Class 10 Science Chemistry MCQ:

• Chemical Reactions and Equations Class 10 MCQ
• Acids, Bases and Salts Class 10 MCQ
• Metals and Non-metals Class 10 MCQ
• Carbon and Its Compounds Class 10 MCQ
• Periodic Classification of Elements Class 10 MCQ

Check the below Online Education NCERT MCQ Questions for Class 7 Science Chapter 1 Nutrition in Plants with Answers Pdf free download. MCQ Questions for Class 7 Science with Answers were prepared based on the latest exam pattern. We have Provided Nutrition in Plants Class 7 Science MCQs Questions with Answers to help students understand the concept very well. https://ncertmcq.com/mcq-questions-for-class-7-science-with-answers/

You can refer to NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Class 7 Science Chapter 1 MCQ With Answers

Science Class 7 Chapter 1 MCQs On Nutrition in Plants

Choose the correct answer:

Class 7 Science Chapter 1 MCQ Question 1.
Which of the following is a nutrient?
(a) Protein
(b) Fat
(c) Vitamin
(d) All of these

Answer

Answer: (d) All of these

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Nutrition In Plants Class 7 MCQ Question 2.
Human beings can be categorised as
(a) heterotrophs
(b) autotrophs
(c) parasites
(d) saprotrophs

Answer

Answer: (a) heterotrophs

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Nutrition In Plants Class 7 MCQ With Answers Question 3.
The food making process in plants is called as
(a) glycolysis
(b) photosynthesis
(c) photolysis
(d) chemosynthesis

Answer

Answer: (b) photosynthesis

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MCQ Questions For Class 7 Science Chapter 1 Question 4.
Which part of the plant is called its food factory ?
(a) Fruits
(b) Seeds
(c) Leaves
(d) Flowers

Answer

Answer: (c) Leaves

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Class 7 Science Ch 1 MCQ Question 5.
Tiny pores present on the surface of leaves through which gaseous exchange occurs are called
(a) stomata
(b) guard cells
(c) food holes
(d) gas holes

Answer

Answer: (a) stomata

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Class 7th Science Chapter 1 MCQ Question 6.
What is the ultimate source of energy for all living organisms?
(a) Water energy
(b) Wind energy
(c) Solar energy
(d) Chemical energy

Answer

Answer: (c) Solar energy

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Ncert Class 7 Science Chapter 1 MCQ Question 7.
Green pigment present in the leaves is called
(a) haemoglobin
(b) globulin
(c) albumin
(d) chlorophyll

Answer

Answer: (d) chlorophyll

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Science Class 7 Chapter 1 MCQ Question 8.
During photosynthesis plants
(a) take oxygen and release carbon dioxide
(b) take carbon dioxide and release oxygen
(c) take carbon dioxide but do not release oxygen
(d) take oxygen but do not release carbon dioxide

Answer

Answer: (b) take carbon dioxide and release oxygen

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Class 7 Chapter 1 Science MCQ Question 9.
During photosynthesis
(а) solar energy is converted into chemical energy
(b) solar energy is converted into mechanical energy
(c) chemical energy is converted into mechanical energy
(d) bioenergy is converted into chemical energy

Answer

Answer: (а) solar energy is converted into chemical energy

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MCQ Questions For Class 7 Science With Answers Chapter 1 Question 10.
The raw materials for photosynthesis are
(а) CO₂
(b) CO₂, O₂, H₂
(c) N₂ water
(d) O₂ water

Answer

Answer: (а) CO₂

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MCQ Class 7 Science Chapter 1 Question 11.
The end products of photosynthesis are
(a) carbohydrates, oxygen
(b) carbohydrates, hydrogen
(c) carbohydrates, water vapours
(d) carbohydrates, oxygen and water vapours

Answer

Answer: (a) carbohydrates, oxygen

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Class 7 Science MCQ Chapter 1 Question 12.
Which one of the following is a parasite?
(a) Lichen
(b) Cuscuta
(c) Pitcher plant
(d) Rhizobium

Answer

Answer: (b) Cuscuta

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Ch 1 Science Class 7 MCQ Question 13.
Which of the following class of organisms belongs to saprotrophs?
(a) Fungi
(b) Algae
(c) Lichens
(d) Bryophytes

Answer

Answer: (a) Fungi

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Science Chapter 1 Class 7 MCQ Question 14.
Which one of the following is a pair of symbiotic organisms?
(a) Lichens
(b) Rhizobium and a legume
(c) None of these
(d) Both (a) and (b)

Answer

Answer: (d) Both (a) and (b)

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Chapter 1 Science Class 7 MCQ Question 15.
Which of the following is an insectivorous plant?
(a) Pitcher plant
(b) Indian telegraph plant
(c) 4 ‘O’clock plant
(d) Cuscuta

Answer

Answer: (a) Pitcher plant

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Match the following:

Column A	Column B
(i) Autotrophs	(a) Fungi
(ii) Heterotroph	(b) Lichen
(iii) Parasite	(c) Pitcher plant
(iv) Saproptroph	(d) Algae
(v) Symbiont	(e) Man
(vi) Insectivorous	(f) Cuscuta

Answer

Answer:

Column A	Column B
(i) Autotrophs	(d) Algae
(ii) Heterotroph	(e) Man
(iii) Parasite	(f) Cuscuta
(iv) Saproptroph	(a) Fungi
(v) Symbiont	(b) Lichen
(vi) Insectivorous	(c) Pitcher plant

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Fill in the blanks:

1. All organisms take ……………… and utilize it to get energy for the growth and the maintenance of their bodies.

Answer

Answer: food

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2. Green plants synthesise their food themselves by the process of ………….. they are called ……………..

Answer

Answer: photosynthesis, autotrophs

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3. …………………. energy is stored by the leaves with the help of chlorophyll.

Answer

Answer: Solar

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4. …………………. derive nutrition from, dead, decaying matter.

Answer

Answer: Fungi/s aprotrophs

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5. Plants like cuscuta take food from ………………… plant.

Answer

Answer: host

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6. All animals are categorised as ……………..

Answer

Answer: heterotrophs

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7. …………….. is produced and …………….. is utilized during photosynthesis.

Answer

Answer: Oxygen, carbon dioxide

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8. …………….. is the site of reception of light energy in leaves.

Answer

Answer: Chlorophyll

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Choose the true and false statements from the following:

1. Food is essential for all living organisms.

Answer

Answer: True

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2. Leaves are the food factories of plant.

Answer

Answer: True

---

3. Water comes into leaves through stomata in the form of vapours.

Answer

Answer: False

---

4. Plants utilize the carbon dioxide dissolved in the water absorbed by the roots for photosynthesis.

Answer

Answer: False

---

5. The sun is the ultimate source of energy for all living organisms.

Answer

Answer: True

---

6. Algae are saprotrophs.

Answer

Answer: False

---

7. Cuscuta is a parasite.

Answer

Answer: True

---

8. Saprotrophs take their food in solution form from dead and decaying matter.

Answer

Answer: True

---

9. Insectivorous plants are partial heterotrophs.

Answer

Answer: True

---

10. Plants take atmospheric nitrogen through stomata and utilize as a nutrient.

Answer

Answer: False

---

We hope the given NCERT MCQ Questions for Class 7 Science Chapter 1 Nutrition in Plants with Answers Pdf free download will help you. If you have any queries regarding Nutrition in Plants CBSE Class 7 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Class 7 Science MCQ:

• Nutrition in Plants Class 7 MCQ
• Nutrition in Animals Class 7 MCQ
• Fibre to Fabric Class 7 MCQ
• Heat Class 7 MCQ
• Acids, Bases and Salts Class 7 MCQ
• Physical and Chemical Changes Class 7 MCQ
• Weather, Climate and Adaptations of Animals to Climate Class 7 MCQ
• Winds, Storms and Cyclones Class 7 MCQ
• Soil Class 7 MCQ
• Respiration in Organisms Class 7 MCQ
• Transportation in Animals and Plants Class 7 MCQ
• Reproduction in Plants Class 7 MCQ
• Motion and Time Class 7 MCQ
• Electric Current and Its Effects Class 7 MCQ
• Light Class 7 MCQ
• Water: A Precious Resource Class 7 MCQ
• Forests: Our Lifeline Class 7 MCQ
• Wastewater Story Class 7 MCQ

Check the below NCERT MCQ Questions for Class 9 Science Chapter 1 Matter in Our Surroundings with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Matter in Our Surroundings Class 9 Science MCQs Questions with Answers to help students understand the concept very well. https://ncertmcq.com/mcq-questions-for-class-9-science-with-answers/

You can refer to NCERT Solutions for Class 9 Science Chapter 1 Light Reflection and Refraction to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Class 9 Science Chemistry Chapter 1 MCQ With Answers

Chemistry Class 9 Chapter 1 MCQs On Matter in Our Surroundings

Matter In Our Surroundings Class 9 MCQ Question 1.
Which of the following phenomena would increase on raising the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases

Answer

Answer: (c) Evaporation, diffusion, expansion of gases

---

Class 9 Science Chapter 1 MCQ Question 2.
Seema visited a Natural Gas Compressing unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions.
(a) Low temperature, low pressure
(b) High temperature, low pressure
(c) Low temperature, high pressure
(d) High temperature, high pressure

Answer

Answer: (c) Low temperature, high pressure

---

MCQ Questions For Class 9 Science Chapter 1 Question 3.
The property of flow is unique to fluids. Which one of the following statements is correct?
(a) Only gases behave like fluids
(b) Gases and solids behave like fluids
(c) Gases and liquids behave like fluids
(d) Only liquids are fluids

Answer

Answer: (c) Gases and liquids behave like fluids

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Matter In Our Surroundings Class 9 MCQ With Answers Pdf Question 4.
During summer, water kept in an earthen pot becomes cool because of the phenomenon of
(a) diffusion
(b) transpiration
(c) osmosis
(d) evaporation

Answer

Answer: (d) evaporation

---

Matter In Our Surroundings MCQ Question 5.
A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?
(a) Water, air, wind
(b) Air, sugar, oil
(c) Oxygen, water, sugar
(d) Salt, juice, air

Answer

Answer: (c) Oxygen, water, sugar

---

Class 9 Chemistry Chapter 1 MCQ Question 6.
On converting 25°C, 38°C and 66°C to Kevlin scale, the correct sequence of temperature will be
(a) 298 K, 311 K and 339 K
(b) 298 K, 300 K and 338 K
(c) 273 K, 278 K and 543 K
(d) 298 K, 310 K and 338 K

Answer

Answer: (a) 298 K, 311 K and 339 K

---

Class 9 Chemistry Chapter 1 MCQ Questions With Answers Question 7.
Choose the correct statement from the following:
(a) Conversion of solid into vapour without passing through the liquid state is called vapourisation.
(b) Conversion of vapour into solid without passing through the liquid state is called sublimation.
(c) Conversion of vapour into solid without passing through the liquid state is called freezing.
(d) Conversion of solid into liquid is called sublimation.

Answer

Answer: (b) Conversion of vapour into solid without passing through the liquid state is called sublimation.

---

Class 9 Science Ch 1 MCQ Question 8.
The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in Kelvin scale?
(a) 306 K, 329 K and 391 K
(b) 308 K, 329 K and 392 K
(c) 308 K, 329 K and 391 K
(d) 329 K, 392 K and 308 K

Answer

Answer: (c) 308 K, 329 K and 391 K

---

Matter In Our Surroundings Class 9 MCQ With Answers Question 9.
Which condition out of the following will increase the evaporation of water?
(a) Increase in temperature of water
(b) Decrease in temperature of water
(c) Less exposed surface area of water
(d) Adding common salt to water

Answer

Answer: (a) Increase in temperature of water

---

Class 9 Matter In Our Surroundings MCQ Question 10.
In which of the following conditions, the distance between the molecules of hydrogen gas would increase?
(i) Increasing pressure on hydrogen contained in a closed container
(ii) Some hydrogen gas leaking out of the container
(iii) Increasing the volume of the container of hydrogen gas
(iv) Adding more hydrogen gas to the container without increasing the volume of the container
(a) (i) and (iii)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

Answer

Answer: (c) (ii) and (iii)

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Science Class 9 Chapter 1 MCQ Question 11.
The boiling point of water at sea level is
(a) 0°C
(b) 273 K
(c) 373 K
(d) 273°C

Answer

Answer: (c) 373 K

---

Class 9 Chapter 1 Science MCQ Question 12.
Which of the following has the strongest interparticle forces at room temperature?
(a) Oxygen
(b) Water
(c) Bromine
(d) Iron

Answer

Answer: (d) Iron

---

Class 9 Science Chapter 1 MCQ Pdf Question 13.
Which of the following conditions is most favourable for converting a gas into a liquid?
(a) High pressure, low temperature
(b) Low pressure, low temperature
(c) Low pressure, high temperature
(d) High pressure, high temperature

Answer

Answer: (a) High pressure, low temperature

---

Ch 1 Science Class 9 MCQ Question 14.
Dry ice is
(a) water in solid state
(b) water in gaseous state
(c) CO₂ in liquid state
(d) CO₂ in solid state

Answer

Answer: (d) CO₂ in solid state

---

Complete the crossword given below:

Down:
1. Process of changing water to water vapour on heating.
2. Process of changing of a liquid into solid.
3. Physical state of water at 120°C.
Across:
4. Process of changing a solid directly to gaseous state.
5. Process of changing a solid into liquid.
6. Process of changing a gas into liquid on cooling.
7. SI unit of temperature.

Answer

Answer:
Down:
1. Vapourisation
2. Solidification
3. Gas

Across:
4. Sublimation
5. Fusion
6. Condensation
7. Kelvin

---

Fill in the blanks:

1. Evaporation of a liquid at room temperature leads to a ………….. effect.

Answer

Answer: cooling

---

2. At room temperature the forces of attraction between the particles of solid substances are ………….. than those which exist in the gaseous state.

Answer

Answer: stronger

---

3. The arrangement of particles is less ordered in the ……………. state. However, there is no order in the ………….. state.

Answer

Answer: liquid, gaseous

---

4. ………… is the change of gaseous state directly to solid state without going through the ……………. state.

Answer

Answer: Sublimation, liquid

---

5. The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called ………………

Answer

Answer: evaporation

---

We hope the given NCERT MCQ Questions for Class 9 Science Chapter 1 Matter in Our Surroundings with Answers Pdf free download will help you. If you have any queries regarding Matter in Our Surroundings CBSE Class 9 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.

Class 9 Science Chemistry MCQ:

• Matter in Our Surroundings Class 9 MCQ
• Is Matter Around Us Pure Class 9 MCQ
• Atoms and Molecules Class 9 MCQ
• Structure of the Atom Class 9 MCQ