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Chapter 4

Combustion and Flame

Science•Class 8•CBSE

14 Questions Available

Showing 14 questions on this page

Why does the matchstick start burning on rubbing it on the side of matchbox?

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State the difference between burning of a candle and burning of a fuel like coal

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It is observed at petrol pumps and airports, that hydrocarbon fire extinguishers are used, instead of soda-acid fire extinguisher. Give reasons why.

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When the clothes of a person catch fire, the person is covered with a blanket to extinguish fire, explain why?

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What is forest fire?

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What do you mean by ignition temperature? Why a matchstick dose not catch fire on its own at room temperature?

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Explain how water gets boiled in paper cup without burning it.

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Why does a piece of paper burn with yellow flame? Give a reason.

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What is acid rain? Write its effects.

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Why isn’t hydrogen gas used as a domestic or industrial fuel, although it has a very high calorific value? State three reasons for the answer.

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On putting glass over a lighted candle, the candle flame flickers and produce smoke, why so?

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Food is a fuel for the body. Justify this statement.