Combustion and Flame Class 8 MCQs Questions with Answers

1. Which gas helps in the process of combustion?

2. Substances which catch fire are called

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

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

5. A temperature at which the substance burns is called

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

7. Which is non-combustible substance?

8. Calorific value of a fuel is expressed in

9. The burning of LPG is an example of

10. ………… have very low ignition temperature.

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

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

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

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

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

16. Burning coal in a closed room will produce

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

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

19. Acid rain contains mainly

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