Karnataka SSLC Science Model Question Paper 5 part of Karnataka SSLC Science Model Question Papers. Here we have given Karnataka SSLC Science Model Question Paper 5.

 Board KSEEB, Karnataka Board Textbook KTBS, Karnataka Class SSLC Class 10 Subject Science Paper Set Model Paper 5 Category Karnataka Board Model Papers

## Karnataka SSLC Science Model Question Paper 5

Time: 3 Hrs.
Max. Marks : 80

I. Four alternatives sire provided for each question. Choose the most appropriate alternative and write it with its alphabet. 10 × 1 = 10

Question 1.
Name the S.I. unit of electric change.
a) Ohm
b) VOH
c) Coloumb
d) Ampere

Question 2.
The substance which is used in a solution for whitewashing is
a) CaO
b) Ca(OH)2
c) CaCO3
d) NaOH

Question 3.
Which of the following lenses would you prefer to use while reading small letters found in a dictionary ?
a) A convex lense of focal length 50 cm
b) A concave lens of focal length 50 cm
c) A convex lens of focal length 5 cm
d) A concave lens of focal length 50 cm

Question 4.
Identify the correct pair of homologous organs among the following.
a) Wings of butterfly and bird
b) The wings of a bat and wings of a bird,
c) The wings of a bird and an insect
d) Human forelimbs and bird wings

Question 5.
Observe the following chemical equations and identify the balanced equation.
a) Fe + H2O → Fe3O4 + H2
b) Fe3 + 4H2O → Fe3O4 + H2
c) 3Fe + 4H2O → Fe3O4 + 4H2
d) Fe3 + 4H2O → Fe3O4 + 4H2

Question 6.
The nature of the image formed by a convex mirror when the object is at infinity is
a) Virtual, errect and extremely diminished
b) A magnified and virtual
c) A diminished & virtual image
d) Virtual, Magnified and errect.

Question 7.
The correct order of binary fission in Amoeba is

a) I II III IV V
b) I III II IV V
c) I IV III V II
d) I IV V II III

Question 8.
The PH value of the solution having highest hydrogen ion concentration is
a) 7.8
b) 1.0
c) 13.0
d) 1.4

Question 9.
The convexocencave lens among the following is

Question 10.
Which of the following constitute a food chain ?
a) Grass, wheat and mango
b) Grass, goat and human
c) Goat, cow and elephant
d) Grass, fish and goat

Question 11.
Match the following:

 A B 1. Phototropism (a)towards chemical responses 2. Geotropism (b) towards water 3. Chemotropism (c) Towards earth’s gravity Hydrotropism (d) Towards light e) Towards touuch of an object.

II. Answer the following:7 × 1 = 7

Question 12.
A thin lens has a focal length of -50cm. What is the power of lens and its nature ?

Question 13.
Why should fossil fuel be used with caution ?

Question 14.
When electricity is passed through an aqueous solution of sodium chloride, three products are obtained. Why is the process called chlor-alkali ?

Question 15.
A florist sprinkled a plant harmone to prevent wilting of leaves. Name the plant harmone he must have used.

Question 16.
Why are the traffic light signals of red colour ?

Question 17.
What is a chemical decomposition reaction ? Give examples.

Question 18.
Ventricles have thicker muscular walls than the atria, why ?

III. Answer the following questions: 16 × 2 = 32

Question 19.
An electric iron of resistance 20 Ω takes a current of 5A calculate the heat developed in 30 S.

Question 20.
Write any two differences between aerobic respiration and anaerobic respiration.
OR
How is oxygen and carbon dioxide transported in human beings ?

Question 21.
Draw the diagram of an illustration of the principle of electric generator and label the following parts.

1. Slip rings
2. Armature

Question 22.
Rahim, a student of class X lives in Delhi, he had an idea in his mind of setting up a thermal power plant in the nearby village. His friend Rohan suggested a solar cell panel to harness solar energy instead of thermal power plant.

1. Do you think that Rohan’s suggestion was appropriate? Justify your answer.
2. Mention the quality Rohan displayed in his act.

Question 23.
What is Hypermetropia ? Name the lens used to correct Hypermetropia.

Question 24.
State Ohm’s law. Give its mathematical expression.
OR
What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series ?

Question 25.
Draw the diagram of the electric circuit in which the resistors R1, R2 & R3 are connected in series including ammeter and voltmeter and mark the direction of current.

Question 26.
Draw a-labelled diagram of the arrangement of apparatus to show the electrolysis of water.

Question 27.
What is bleaching powder ? Explain the preparation of bleaching powder with the help of balanced chemical equation.

Question 28.
Draw the diagram showing the longitudinal section of a typical flower and label the parts.

Question 29.
What are sexually transmitted diseases ? Name an STD which damages the immune system of human body?

Question 30.
a) Arrange the metals in the decreasing order of reactivity with dilute hydrochloric acid. Mg. Zn, A1 and Fe. b) Hydrogen is not a metal but it has been assigned a place in the activity series of metals, why ?
OR
Give one most suitable word for the following statements.

1. Metal oxides which show basic as well as acedic behaviour.
2. Some metals produce a sound on striking a hard surface.

Question 31.
Write the balanced chemical equations for the chemical reactions given below,

1. Magnesium reacts with dilute HNO3.
2. Sodium reacts with water.

OR
A solution of copper sulphate was kept in an iron pot. After a few days, the iron pot was found to have a number of holes in it. Write the equation of the reaction that took place. Explain this reaction in terms of reactivity.

Question 32.
What are the practices that can protect our environment ?

Question 33.
What is an homologous series ? Write the general formula of

1. alkenes and
2. alkynes

OR
Draw the stuctures for the following compounds,

1. Ethanoic acid
2. Bromopentane

Question 34.
Draw the ray diagram showing the formation of the image, when the object is kept at the principle focus (F) of a concave mirror.

IV. Answer the following questions : 5 × 3 = 15

Question 35.
Draw the diagram showing the structure of a human alimentary canal and label the parts.

Question 36.
Name the type of mirror used in the following situations and support your answer with reason.
a) Head Lights of a car
b) Side or rear-view mirror of a vehicle
c) Solar furnace.
OR
Define absolute refractive index of a medium. The refractive index of diamond is 2.42. What is the meaning of this statement ? For which medium is refractive index is minimum ?

Question 37.
How has the traditional use of wind and water energy been modified for our convenience ?
OR
“We are looking for alternative sources of energy”, State three reasons for it.

Question 38.
Nitrogen (atomic number – 7) and phosphorous (atomic number 15) belong to group 15 of the periodic table write the electronic configuration of these two elements. Which of these will be more electronegative? Why?

Question 39.
Draw the diagram of the apparatus used for electrolytic refining of copper and label the parts.

V. Answer the following questions : 3 × 4 = 12

Question 40.
a) What are sex chromosomes ? Name the two types of sex chromosomes.
b) Which sex chromosomes are found in male and female human beings ?
State the chromosome responsible for the development of male child in human beings.
OR
a) How do Mendel’s experiments show that traits may be dominant or recessive ?
b) What is Darwin’s theory of evolution ?

Question 41.
a) Explain decomposition reaction with an example and chemical equation
b) Why is respiration considered as exothermic reaction ? Explain.

Question 42.
A coil of insulated copper wire is connected to a galvanometer as shown in the figure. What will happen if North pole of an bar magnet is

1. pushed into the coil ?
2. Withdrawn from inside the coil ?
3. held stationary inside the coil ?
4. Name and state the phenomenon.

I.
c) Coulomb

a) CaO

c) A Convex lens of focal length 5 cm.,

d) Human forelimbs and bird wings.

c) 3Fe + 4H2O → Fe3O4 + 4H2

a) Virtual, errect and extremely diminished,

b) I III II IV V

b) 1.0

b) Grass, goat and human

l-(d),2-(c),3-(a),4-(b)

Power of lens, $$P=\frac{1}{f(i n m)}$$

Its nature is concave because its focal length is negative.

It took millions of years for fossil fuels to be formed. So if all the fossil fuels are exhausted today, then it takes a long period of million of years to form again. So they should be used with care and caution.

When sodium chloride is electrolysed, sodium is obtained at cathode which then reacts with water to give alkali and hydrogen. Thus alkali is the main product, on the other hand Chlorine is obtained at anode. So it is called chlor-alkali process.

Cytokinins [because they induce cell elongation and delay aging they enhance chloroplast development in leaves].

In the visible spectrum, the red colour has the largest wavelength. The red colour is least scattered by fog or dust particles. So we can observe red colour easily even in foggy and dusty conditions.

The reaction in which a single reactant breaks down to give simpler products is called chemical decomposition reaction.

Because in ventricles, blood comes with pressure as compared to the atrium.

Given I = 5A, R=20Ω , t=30 s
Heat developed H = ?
H = I2Rt = 52 × 20 × 30 = 25 × 20 × 30
H = 15000 J

 Aerobic respiration Anaerobic respiration 1. Aerobic respiration takes place in the presence of oxygen. 1. Anaerobic respiration takes place in the absence of oxygen 2. In aerobic respiration complete oxidation of glucose takes place. 2. The glucose molecule is incompletely broken down. 3. End products are CO2 and water. 3. End products are ethyle alcohol [or lactic acid] and CO2 4. More energy is released. 4. Little energy is released.

OR
a) Transport of Oxygen: In human beings the respiratory pigment called haemoglobin present in the red blood corpuscles carry oxygen to different tissues of the body. The respiratory pigment present in the blood takes up the oxygen from the air in the lungs and carry it to tissues which are deficient in oxygen.
b) Transport of carbon dioxide: Carbon dioxide is more soluble in water. Therefore it is mostly transported in dissolved form through blood plasma. Blood plasma transports carbon dioxide from the tissues to the lungs.

1. Rohan’s suggestion is more appropriate as setting up of thermal plant is more cumbersome and is likely to cause lots of pollution.
2. Rohan displayed more maturity and practicality.

Hypermetropia or long sightedness is a vision defect in which a person can see the distant objects clearly but cannot see the nearby objects clearly.
A hypermetropia is corrected by using a convex lens of suitable focal length.

Ohm’s law states that the current (I) flowing through a conductor is directly proportional to the potential difference (v) applied across its ends, provided the temperature and other physical conditions remain unchanged.
Mathematical expression is V α I or V=RI
Where ‘R’ is the propertionality constant and is called resistance of the conductor.
OR
The advantages of connecting electrical devices in parallel with the battery are as follows.

1. Each device gets the full battery voltage.
2. The parallel circuit devides the current through the electrical devices. Each device gets proper current depending on its resistance.

Calcium Oxychloride [CaOCl2] is called bleaching powder.
Preparation : This is prepared by passing chlorine gas over dry slaked lime for a long time. Equation : Ca(OH)2 + Cl2 → CaOCl2 + H2O

The diseases which are transmitted from one person to another by the sexual act are called sexually transmitted diseases (STD). These include bacterial infections like gonorrhoea and syphilis and viral infections like warts and AIDS.

AIDS is the STD which damages the immune system of human body. It is caused by HIV
NOTE: [AIDS → Acquired Immuno Deficiency Syndrome]
[HIV → Human Immuno deficiency virus]

a) Mg > Al > Zn > Fe
b) The reactivity of metals depends on the ease with which they can lose electrons. Hydrogen also loses one electron more easily than some other metals and forms positive ions. Therefore it also finds a place in the activity series of metals.
OR

1. Amphoteric oxide,
2. Sonorous

i) Mg(s) + 2HNO3(aq) → Mg(NO3 )2 + H2(g)
ii) 2Na(s) + 2H2O → 2NaOH + H2(g)
OR
Iron is more reactive than copper and so iron displaces copper from copper sulphate solution. Since iron is being consumed, hole appear in the pot on the other hand, CU2++ ions in solution change into copper metal.
Equation : CuSO4 + Fe → FeSO4 + Cu
Reactivity:
$$\begin{array}{l}{F e_{(s)} \rightarrow F e_{(a q)}^{2+}+2 e^{-}} \\ {C u_{(a q)}^{2+}+2 e \rightarrow C u_{(S)}} \\ {F e_{(S)}+C u_{(a q)}^{2+} \rightarrow C u_{(S)}+F e^{2+}}\end{array}$$

Practices that can protect our environment are

1. Disposal of the wastes after separating them into biodegradable and non-biodegradable waste material.
2. Use of unlead petrol and alternate sources of energy and keeping the automobile vehicle engines properly tune to avoid pollution.
3. Installation of tall chumneys in factories. These may be fitted with removal of gaseous and particulate emissions devices.
4. Use of smokeless fuels in homes and industries.
5. Plantation of trees. They will help to absorb excess of CO2 and pollution.
6. Do not burn any waste, especially plastics, as the smoke contains polluting gases.

A homologous series is a group or family of compounds which contains the same functional group but have different chain lengths. These chains can be branched also. Thus, these have the same chemical properties but different physical properties that vary in a regular manner.
The general formula of

i) alkenes is CnH2n
ii) alkynes is CnH2n-2 Where n=2, 3, 4, etc,.
Organism
i) Ethanoic acid:

ii) Bromopentane:

a) Concave mirrors are used as reflectors in headlights of cars. Because, when a bulb is located at the focus of the concave mirror, the light rays after reflection from the mirror travel over a large distance as a parallel beam of high intensity.
b) A Convex mirrors is used as a side or rear view mirror of a vehicle because it always forms an erect, virtual and diminished image and it has a wider field of view than a plane mirror of the same size.
c) Large concave mirrors are used to concentrate sunlight to produce heat in Solar furnaces.
OR
The refractive index of a medium for a light of given wavelength may be defined as the ratio of the speed of light in vaccum to its speed in that medium. It is denoted by n

The refractive index of a medium with respect to vacuum is also called its absolute refractive index.
The refractive index of diamond is 2.42 means that the ratio of speed of light in air to that in diamond is 2.42.
Refractive index is minimum for vacuum i.e. (n=1)

Water Energy: To use water energy for producing electricity, a large number of high rise dams are constructed on the suitable river spots to obstruct the flow of water and collect water in large reservoirs. The kinetic energy of the flowing water is converted into potential energy. Then the water from the high level in the dam is carried through pipes to the turbine at the bottom of the dam. Thus the potential energy of falling water is converted into electrical energy.

Wind Energy: Wind mill farms are constructed at places where wind flows for greater part of the year at a speed greater than 15 km/h. The kinetic energy of the wind is converted into rotatory motion of wind mill. Then the rotatory motion of the wind mill is used to turn the turbine of electric generator.
OR
Non conventional sources of energy means such sources which are not in routine use so far like solar- energy, geothermal energy etc,. As industrialization is growing and our living standards are improving our conventional sources of energy are depleting and so we have to tap new sources and develop and so we have to tap new sources and develop technology to capture and store energy from such sources.

Further most of the conventional sources of energy are causing air pollution, health hazards and environment imbalance.
Hence we are looking for alternative sources of energy.

Electronic Configuration of
Nitrogen [at No. 15] is 1S2 2S2 2P3 or 2, 5
Phosphorus [at No. 15] 1S2, 2S2 2P6, 3S2 3P3 or 2,8, 5
Nitrogen will be more electronegative because outermost shell is nearer to nucleus and thus nucleus will attract electrons more strongly.

a) The chromosomes which determines sex of a person are called sex chromosomes. These are two types of sex chromosomes. They are X chromosome and Y chromosome
b) A male has one X chromosome and one Y-Chromosome.
A female has two X chromosomes.
If a sperm carrying Y chromosome fertilises an egg which carries X-Chromosomes then the child born will be a male.
OR
a) When mendel cross pollinated pure tall pea plants with pure dwarf pea plant he got tall plants in F: generation. When mendel self pollinated Fj tall plants, he got both tall and dwarf plants in the ratio 3:1. This shows that dwarf character was present in Fj tall plants but it was not expressed and only trait of tallness was expressed. From this we may conclude that triats may be dominant or recessive. The traits which gets expressed in the presence of its contrasting form gets expressed in the presence of its contrasting form is called dominant trait and the trait which remains unexpressed in the presence of its contrasting form its called recessive trait.
b) Organism multiply in large numbers but the number of survivors is roughly constant. There is struggle for existance and due to acting upon by natural selection on variation there is survival of the fittest, which leads to the formation of new species.

a) Decomposition Reaction :
The reaction in which a compound splits up into two or more simpler substances is called decomposition reaction [In most of the decomposition reactions heat is used. This is called thermal decomposition. Some times light electricity or catalyst is also used]
Eg.: Electrolytic decomposition :
Water decomposes when electricity is passed through it.
$$2{ H }_{ 2 }O\underrightarrow { electricity } 2{ H }_{ 2 }+{ O }_{ 2 }$$
b) During digestion food is broken down into simpler substances food like rice, potato and bread are made up of carohydrates. These carbohydrates are further broken down to glucose. Glucose during respiration (inhalation of oxygen) is oxidised with the liberation of energy as shown below.