MEDIUM
8th CBSE
IMPORTANT
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of the fuel is the heat liberated when one gram of fuel burns completely in oxygen.

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Important Questions on Combustion, Flame and Fuels

EASY
8th CBSE
IMPORTANT
_____ is a region where combustion of fuel takes place. (Flame/ Vacuum)
MEDIUM
8th CBSE
IMPORTANT
If the amount of oxygen present is limited, it results in the _____ combustion of fuel. (incomplete/complete)
MEDIUM
8th CBSE
IMPORTANT
Ideal fuel has _____ calorific value. (low/ high)
MEDIUM
8th CBSE
IMPORTANT
Water is not suitable for fire caused due to _____. (fireworks / electrical short circuit)
MEDIUM
8th CBSE
IMPORTANT
_____ (Explosive / Rapid / spontaneous) combustion occurs when a substance unexpectedly bursts into flame and can cause a serious fire.
EASY
8th CBSE
IMPORTANT
Complete combustion takes place in the presence of air.
MEDIUM
8th CBSE
IMPORTANT
Substances that catch fire easily in the presence of oxygen are called flammable substances.
MEDIUM
8th CBSE
IMPORTANT
The flame of a Bunsen burner is blue when the air hole is clogged, and it does not get a sufficient supply of oxygen.