Combustion and Flame Class 8 MCQ Online Test With Answers Questions

Check the below NCERT MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers Pdf free download. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. We have provided Combustion and Flame 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 6 Combustion and Flame to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Class 8 Science Chapter 6 MCQ With Answers

Science Class 8 Chapter 6 MCQs On Combustion and Flame

Choose the correct option in the following questions:

Combustion And Flame Class 8 MCQ Question 1.
Which one of the following gases is used in combustion?
(a) Hydrogen
(b) Oxygen
(c) Nitrogen
(d) Carbon dioxide

Answer

Answer: (b) Oxygen

Class 8 Science Chapter 6 MCQ Question 2.
The burning of LPG is an example of
(a) rapid combustion
(b) spontaneous combustion
(c) slow combustion
(d) explosion

Answer

Answer: (a) rapid combustion

Class 8 Science Ch 6 MCQ Question 3.
A temperature at which the substance burns is called
(a) melting
(b) boiling temperature
(c) kindling temperature
(d) evaporation

Answer

Answer: (c) kindling temperature

MCQ Questions For Class 8 Science Chapter 6 Question 4.
Which is non-renewable source of energy’?
(a) Natural gas
(b) Wind energy
(c) Tidal energy
(d) Mechanical energy

Answer

Answer: (a) Natural gas

Class 8 Chapter 6 Science MCQ Question 5.
Which of the following is not a fossil fuel?
(a) Coal
(b) Petroleum
(c) Natural gas
(d) Water gas

Answer

Answer: (d) Water gas

Ch 6 Science Class 8 MCQ Question 6.
Which gas helps in the process of combustion?
(a) Cooking gas
(b) Nitrogen gas
(c) Oxygen gas
(d) Producer gas

Answer

Answer: (c) Oxygen gas

MCQ Of Combustion And Flame Class 8 Question 7.
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called
(a) calorific value
(b) significant value
(c) heat value
(d) internal energy

Answer

Answer: (a) calorific value

Class 8 Combustion And Flame MCQ Question 8.
Which zone represents the partial combustion in candle flame?
(a) Outer zone
(b) Middle zone
(c) Inner zone
(d) Lower zone

Answer

Answer: (b) Middle zone

Combustion And Flame MCQ Question 9.
Burning coal in a closed room will produce
(a) nitrogen oxides
(b) carbon dioxide
(c) carbon monoxide
(d) oxygen

Answer

Answer: (c) carbon monoxide

Chapter 6 Science Class 8 MCQ Question 10.
Substances which catch fire are called
(a) acids
(b) bases
(c) combustible
(d) burners

Answer

Answer: (c) combustible

Class 8 Ch 6 Science MCQ Question 11.
Out of these, which is able to control fires?
(a) NH₃
(b) H₂
(c) CO₂
(d) F₂

Answer

Answer: (c) CO₂

Class 8 Chapter 6 MCQ Science Question 12.
Which zone of a flame does a goldsmith use for melting gold and silver ?
(a) Outer zone
(b) Middle zone
(c) Inner zone
(d) Lower zone

Answer

Answer: (a) Outer zone

Science Class 8 Chapter 6 MCQ Question 13.
Calorific value of a fuel is expressed in
(a) kilojoule per kilogram
(b) kilojoule per gram
(c) joule per milligram
(d) kilojoule per milligram

Answer

Answer: (a) kilojoule per kilogram

MCQ For Class 8 Science Chapter 6 Question 14.
Which is non-combustible substance?
(a) Wood
(b) Paper
(c) Iron nails
(d) Straw

Answer

Answer: (c) Iron nails

MCQ On Combustion And Flame Class 8 Question 15.
Acid rain contains mainly
(a) oxygen and nitrogen gas
(b) fluorine and chlorine gas
(c) magnesium oxide
(d) nitrogen oxide and sulphur dioxide

Answer

Answer: (d) nitrogen oxide and sulphur dioxide

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

Column A	Column B
Fire extinguisher	Burning of candle
Slow oxidation	Renewable source
Kindling temperature	Natural gas
Tidal energy	Cooking gas
Fossil fuel	Inflammable
Oxygen gas	Burning starts
LPG	Carbon dioxide
Alcohol	Supporter of combustion

Answer

Answer:

Column A	Column B
Fire extinguisher	Carbon dioxide
Slow oxidation	Burning of candle
Kindling temperature	Burning starts
Tidal energy	Renewable source
Fossil fuel	Natural gas
Oxygen gas	Supporter of combustion
LPG	Cooking gas
Alcohol	Inflammable

Fill in the blanks with appropriate words:

1. ………… of fuel forms poisonous carbon monoxide gas.

Answer

Answer: Incomplete combustion

2. ………… is expressed in terms of its calorific value.

Answer

Answer: Fuel efficiency

3. ………… have very low ignition temperature.

Answer

Answer: Inflammable substances

4. ………… is essential for combustion.

Answer

Answer: Oxygen (in air)

5. The substances, which burn in air, are called …………

Answer

Answer: combustible

6. ………… is better domestic fuel than wood.

Answer

Answer: LPG

7. Goldsmith uses the ………… zone of the flame for melting gold and silver.

Answer

Answer: outermost

State whether the statement given below are True or False.

1. Food is a fuel for our body.

Answer

Answer: True

2. Burning of charcoal produces flame with four distinct zones.

Answer

Answer: False

3. The fuel can be only liquid in nature.

Answer

Answer: False

4. Sun produces heat and light because of combustion.

Answer

Answer: False

5. It is easy to burn a piece of wood through matchstick.

Answer

Answer: False

6. Soda acid fire extinguisher contains sodium bicarbonate + dil. Sulphuric acid.

Answer

Answer: True

7. The inner central dark zone of a candle flame is the hottest region.

Answer

Answer: False

8. The principle of all fire-extinguisher is to cut off the air supply and to cool the burning substance below its ignition temperature.

Answer

Answer: True

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