EASY
8th CBSE
IMPORTANT
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In a candle, wax melts and then burns. The change which results in the evolution of heat is the melting of wax.

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Important Questions on Combustion and Flame

MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q C
In a candle flame, the innermost part is the hottest and the outermost part is the coolest zone.
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q C
Every combustible substance is a fuel.
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q C
Hydrogen gas has the highest calorific value among all fuels and it has no emissions other than water vapour.
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q C
Burning of coal in thermal power plants can result in acid rain.
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q C
Soot, a by-product of combustion, is not harmful for us as it contains only carbon.
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q D
What is combustion?
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q D
What are the conditions necessary for combustion to take place?
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Exercises>Q D
What is the difference between combustible and non-combustible substances?