Combustion and Flame Class 8 MCQs Questions with Answers

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

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

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

4. The burning of LPG is an example of

5. ………… have very low ignition temperature.

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

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

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

9. A temperature at which the substance burns is called

10. Which gas helps in the process of combustion?

11. Acid rain contains mainly

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

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

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

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

16. Burning coal in a closed room will produce

17. Which is non-combustible substance?

18. Substances which catch fire are called

19. Calorific value of a fuel is expressed in

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