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Mark the correct answer in each of the following.
(i) Early man was frightened of
(a) lightning and volcanoes.
(b) the damage caused by them.
(c) fire.
(ii)
(a) Fire is energy.
(b) Fire is heat and light.
(c) Fire is the result of a chemical reaction.
(i) Early man was frightened of fire.
(ii) Fire is the result of a chemical reaction.
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From the boxes given below choose the one with the correct order of the following sentences.
(i) That is fire.
(ii) A chemical reaction takes place.
(iii) Energy in the form of heat and light is released.
(iv) Oxygen combines with carbon and hydrogen.
(i) (ii) (iii) (iv)
(ii) (iii) (i) (iv)
(iv) (iii) (ii) (i)
(iv) (ii) (iii) (i)
D.
(iv) (ii) (iii) (i)
What do you understand by the ‘flash point’ of a fuel?
The temperature at which a fuel begins to burn is called its flash point.
(i) What are some common uses of fire?
(ii) In what sense is it a “bad master”?
(i) Some of the common uses of fire are to cook food, warm the homes in winter and to generate electricity.
(ii) It is a “bad master” because if it is not kept under control, it can prove very dangerous. Each year thousands of homes and shops are damaged by fire. Vast areas of forest are also destroyed and hundreds of people are killed or injured.
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