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Q.

Is it true that knitting wool into a sweater is a physical change?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
A change in a substance's shape, size, colour, or state of matter is called a physical change. In such a change, no new substance is produced. And a significant point regarding physical change is that a physical change is generally reversible. In a physical change, no new substance is formed. In this case, when the wool is knitted into a sweater, the appearance is changed and no new substance is formed. We can get back the wool from the sweater, and thus it is a physical change.
 
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