Combustion and Flame Class 8 MCQs Questions with Answers

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

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

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

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

5. The burning of LPG is an example of

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

7. Which gas helps in the process of combustion?

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

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

10. Burning coal in a closed room will produce

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

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

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

14. A temperature at which the substance burns is called

15. Substances which catch fire are called

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

17. Which is non-combustible substance?

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

19. Calorific value of a fuel is expressed in

20. Acid rain contains mainly