Combustion and Flame Class 8 MCQs Questions with Answers

1. A temperature at which the substance burns is called

2. Acid rain contains mainly

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

4. Which is non-combustible substance?

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

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

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

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

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

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

11. Calorific value of a fuel is expressed in

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

13. ………… have very low ignition temperature.

14. The burning of LPG is an example of

15. Which gas helps in the process of combustion?

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

17. Substances which catch fire are called

18. Burning coal in a closed room will produce

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

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