Question

Give reasons for each of the following.
(a) Water is commonly used to put out a fire.
(b) Water should not be used to put out a fire caused by oil or petrol.
(c) The middle zone of flame is yellowish in colour.
(d) Carbon dioxide is used to put out a fire caused by petrol or kerosene.
(e) A goldsmith blows the outermost zone of a flame with a metallic blowpipe to melt
gold pieces.​

Answer 1

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Explanation:

(a)Water is commonly used to put out a fire because it cools down the combustible material and thus helps to put off the fire.

(b)Water should not be used to put out a fire caused by oil or petrol because water is heavier than oil.So, the oil or petrol floats on water and it keeps on burning.

(c) The middle zone of flame is yellowish in colour because in the middle zone partial combustion occurs.

(d)Carbon dioxide is used to put out a fire caused by petrol or kerosene because it cuts of the supply of oxygen and thus fire is put off.

(e)A goldsmith blows the outermost zone of a flame with a metallic blowpipe to melt gold pieces because the outermost zone of a flame is the hottest part of the flame.

Answer 2

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