Class 8 Science Chapter-7 Combustion DAV|CBSE Book Solutions 2021 

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Class 8 Science Chapter 7 : Combustion  

This Post Contains All The Exercises of Chapter 7 Science Of Class 8.

• A.Fill In The Blanks.

• B. State true or false for the following statements

• C.Tick(√) The Correct Option

• D.Answer The Following Questions in Brief 

• E.Answer The Following Questions
• Value Based Question
• Something To Do

A. Fill in the blanks (chapter 7 Combustion of DAV|CBSE Book 2021)

1. A good fuel should have its ignition temperature above the room temperature.

2. Burning of cowdung cakes is an example of slow combustion.

3. The innermost zone of a candle flame, is the coldest.

4. The non-luminous zone of a candle flame is the outermost / hottest part of the flame.

5. During incomplete combustion of a fuel, Carbon Monoxide (CO) gas is formed.

B. State true or false for the following statements (chapter 7 Combustion of DAV|CBSE Book 2021)

1. Coal is an inflammable fuel.

Ans- False

2.The outermost part of a candle flame contains unburnt carbon particles.

Ans- False

3. The heat produced, by burning completely one kilogram of a given fuel, is known as the efficiency of that fuel.

Ans- True

4. All solid fuels have a higher calorific value than liquid and gaseous fuels.

Ans- False

5. Sulphur dioxide gas, produced during combustion of fossil fuels, causes acid rain.

Ans- True

C. Tick the correct option (chapter 7 Combustion of DAV|CBSE Book 2021)

1. An example of a non-combustible substance is----

Ans- Iron

2. A fuel starts burning only when it is heated to----

Ans- Its ignition temperature

3. The highest temperature zone of a candle flame, is its----

Ans- Blue zone

4. The amount of heat produced, on complete burning of 10 kg of a given fuel, in pure oxygen, equals H kilojoule. The calorific fuel, of that fuel, would equal----

Ans- (0.1 H) kj/kg

5. The gas produced, due to incomplete combustion of carbon fuels, is----

Ans- Carbon monoxide 

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