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Q.

Is it true that a lump of cotton wool shrinks in water?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
A lump of cotton wool contains a sufficient volume of air. When the cotton lump is dipped in water, the air escapes, causing it to shrink. A cotton wool lump contains air between the gaps of cotton fibres. When water replaces the air in these gaps, the cotton lump becomes heavy and shrinks as the air gaps are filled.
 
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Is it true that a lump of cotton wool shrinks in water?