Combustion and Flame Class 8 MCQs Questions with Answers

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

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

3. Calorific value of a fuel is expressed in

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

5. Which gas helps in the process of combustion?

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

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

8. Substances which catch fire are called

9. A temperature at which the substance burns is called

10. Burning coal in a closed room will produce

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

12. The burning of LPG is an example of

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

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

15. Acid rain contains mainly

16. Which is non-combustible substance?

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

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

19. ………… have very low ignition temperature.

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