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Q.

A steel stopper snuggly fits in the hole of brass plate. To remove the stopper easily, the system

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a

Should be heated

b

Should be cooled

c

May be heated or cooled

d

Cannot be removed by heating or cooling

answer is A.

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Detailed Solution

αbrass>αsteel . System must be heated which causes more expansion in brass disc and less expansion in the hole of steel plate.
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A steel stopper snuggly fits in the hole of brass plate. To remove the stopper easily, the system