Combustion and Flame Class 8 MCQs Questions with Answers

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

2. Substances which catch fire are called

3. The burning of LPG is an example of

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

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

6. Acid rain contains mainly

7. Calorific value of a fuel is expressed in

8. Which gas helps in the process of combustion?

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

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

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

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

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

14. Burning coal in a closed room will produce

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

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

17. Which is non-combustible substance?

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

19. A temperature at which the substance burns is called

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