EASY
8th CBSE
IMPORTANT
Earn 100

What are the characteristics of a good fuel?

Important Questions on Combustion and Flame

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.
EASY
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 3
When a fuel is burnt, carbon dioxide (or carbon monoxide) and water vapour are given out. Can you name one fuel which burns without giving off water vapour? Why does it not give out water?
MEDIUM
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 4
 Why does a matchstick burn on rubbing it on the side of the matchbox?
MEDIUM
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 5
Your LPG gas stove at home is giving a yellow flame. What can this mean?
MEDIUM
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 6
A flame always points upwards. Why do you think this is so?
MEDIUM
8th CBSE
IMPORTANT
Living Science 8>Chapter 6 - Combustion and Flame>EXERCISES>Q 7
When a candle burns, is it possible to get the wax back
  • after the wax melts?
  • after the wax burns?