Combustion and Flame Class 8 MCQs Questions with Answers

1. Substances which catch fire are called

2. Burning coal in a closed room will produce

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

4. Which gas helps in the process of combustion?

5. Calorific value of a fuel is expressed in

6. Which zone represents the partial combustion in candle flame?

7. Which is non-renewable source of energy’?

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

9. ………… have very low ignition temperature.

10. A temperature at which the substance burns is called

11. Which one of the following gases is used in combustion?

12. Out of these, which is able to control fires?

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

14. The burning of LPG is an example of

15. Which is non-combustible substance?

16. Acid rain contains mainly

17. Which zone of a flame does a goldsmith use for melting gold and silver ?

18. _________ fire extinguisher contains sodium bicarbonate + dil. Sulphuric acid.

19. Which of the following is not a fossil fuel?

20. The amount of heat energy produced on complete combustion of 1 kg of a fuel is called