Combustion and Flame Class 8 MCQs Questions with Answers

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

2. Which gas helps in the process of combustion?

3. A temperature at which the substance burns is called

4. Calorific value of a fuel is expressed in

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

6. Acid rain contains mainly

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

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

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

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

11. Burning coal in a closed room will produce

12. The burning of LPG is an example of

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

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

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

16. Which is non-combustible substance?

17. ………… have very low ignition temperature.

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

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

20. Substances which catch fire are called