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8th CBSE
IMPORTANT
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A stove is supposed to produce a blue flame. What could be wrong if it produces a yellow flame?

Important Questions on Combustion and Flame

EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Looking Back>Q 1
The chemical reaction in which a fuel burns to release energy is called _____. (combustion/ decomposition)
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Looking Back>Q 2
The _____ temperature is the minimum temperature at which a substance catches fire.
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8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Looking Back>Q 3
Combustion of LPG can be classified as _____ combustion. (rapid/ spontaneous/ explosion)
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Looking Back>Q 4
The soda-acid fire extinguisher gives out _____ to extinguish a fire. (carbon dioxide/ carbon monoxide)
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)
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Looking Back>Q 1
The zone that produces light in a candle flame is called the _____ zone. (luminous/ blue/ dark)
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Looking Back>Q 2
The unburnt carbon particles escaping from a candle flame form a black, powdery substance called _____. (Soot/ Coke)
EASY
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 6 - Combustion and Flame>Looking Back>Q 3
The amount of heat evolved, in joules, when one kilogram of fuel is burnt completely, is called the _____ value of the fuel.