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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