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Q.

Which of the following is incorrect about the heating of an iron ring?


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a

The ring expands.

b

The ring virtually returns to its original size after cooling. 

c

The change can be reversed.

d

The ring changes shape and the change is irreversible.  

answer is D.

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Detailed Solution

On heating the iron ring, it changes shape and the change is irreversible.
Metallic substances increase in size (expand) when heated and decrease in size when cooled down (shrink). When an iron ring, which is metallic in nature, is heated, the ring expands in size. It can be practically returned to its original size when cooled down. This indicates that it is a reversible change.
  
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Which of the following is incorrect about the heating of an iron ring?