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Q.

Which of the following happens when a lump of cotton wool is dipped in water?


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a

Shrinks

b

Swells

c

Remains same

d

Depends on wool 

answer is A.

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Detailed Solution

 When a lump of cotton wool is dipped in water, it shrinks.
A lump of cotton wool has a lot of air trapped inside the space present in its fibres. When this lump of cotton is immersed in water, all the air is replaced by water. Due to this, the cotton lump becomes heavy and shrinks down due to the removal of air gaps. This is a physical change and it is a reversible process.
  
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