EASY
8th CBSE
IMPORTANT
Earn 100

What is calorific value of a fuel? Why is hydrogen not used as a fuel though it has the highest calorific value?

Important Questions on Combustion and Flame

EASY
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q D
How are fuels classified on the basis of their physical state? Give two examples of each.
EASY
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q D
How is burning of fossil fuels thought to be related to global warming?
MEDIUM
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q E

Explain, with the help of a labelled diagram, how a soda-acid type fire extinguisher works.

MEDIUM
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q E
Name the different zones of a candle flame. Give details of the conditions in each zone.
EASY
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q E
What are the characteristics of a good fuel?
MEDIUM
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q E
Discuss the impact of burning fuels on air.
MEDIUM
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 1
Only gases burn with a flame. But when you burn wood, it initially burns with a flame. Later, it only glows without a flame. What do you think is the reason for this?
HARD
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 2
Would you consider coal as a good fuel? Give reasons.