Combustion and Flame (Practice Sheet, Class 8)

(1) What is spontaneous combustion?

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(2) Why blanket wrapped around a person who got fire?

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(3) Is heat from the Sun an example of combustion?

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(4) Cooking oil never catches fire when a frying pan is kept for long on a burning stove?

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(5) A person is throwing water on fire caught by oil. But he is not getting success to extinguish fire. Why?

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(6) What is acid rain and why it is not useful?

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(7) In an experiment 15000 kj/kg calorific value produced by 2 kg fuel. What is the amount of heat produced?

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(8) What is inflammable substance?

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(9) Fill in the blanks

(i) _____ and _____ are the best fire extinguishers.

(ii) Kerosene has _____Igneous temperature than wood.

(iii) Partially combustion takes place in _____ zone of flame.

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(10) What is a flame? Name all three zone of the flame.

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Helping Toipcs

Combustion and flame

NCERT solutions, class 8

Heat

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