Combustion and Flame Class 8 MCQs Questions with Answers

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

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

3. Acid rain contains mainly

4. A temperature at which the substance burns is called

5. The burning of LPG is an example of

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

7. Burning coal in a closed room will produce

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

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

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

11. Substances which catch fire are called

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

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

14. Calorific value of a fuel is expressed in

15. ………… have very low ignition temperature.

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

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

18. Which is non-combustible substance?

19. Which gas helps in the process of combustion?

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