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Q.

A metal disc having a circular hole at its centre is heated. If metal expands on heating the diameter of the hole will

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a

Increase

b

Decrease

c

remains unchanged

d

a & b depends on the metal

answer is A.

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Detailed Solution

When we heat any substance the expansion takes place radically out ward from the center.

 B – Expansion takes place in metal disc.

  C – Metal substances will expand on heating

   D – All type metals expands on heating. But a few substances contract on heating (But metal disc expands in heating).

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