Combustion and Flame Class 8 MCQs Questions with Answers

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

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

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

4. A temperature at which the substance burns is called

5. Which gas helps in the process of combustion?

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

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

8. The burning of LPG is an example of

9. Burning coal in a closed room will produce

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

11. ………… have very low ignition temperature.

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

13. Calorific value of a fuel is expressed in

14. Which is non-combustible substance?

15. Substances which catch fire are called

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

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

18. Acid rain contains mainly

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

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