HARD
8th CBSE
IMPORTANT
Earn 100

Draw a labelled diagram of a soda-acid fire extinguisher. Explain how it works.

Important Questions on Combustion and Flame

EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Looking Back>Q 5
The _____ fire extinguisher is used to extinguish oil fires. (foam/ water)
HARD
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q E
Draw a labelled diagram of a candle flame and explain what happens in each zone.
HARD
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q E
Compare the usefulness of solid, liquid and gaseous fuels.
HARD
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q E
What are the characteristics of a good fuel? Which fuel comes closest to an ideal fuel?
HARD
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q E
Write a short note on the harmful by-products of combustion.
HARD
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Higher-order Thinking Skills>Q 1
Why does a candle flame go out when you blow on it? (Hint: It is wax vapour that burns. Think of the methods used to extinguish fires and what happens to the vapour when you blow on it)
HARD
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Higher-order Thinking Skills>Q 2
Hydrogen has the highest calorific value and also does not cause pollution. Why is it not used as a domestic fuel?
HARD
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Higher-order Thinking Skills>Q 3
A stove is supposed to produce a blue flame. What could be wrong if it produces a yellow flame?