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At some temperature T, a bronze pin is a little large to fit into a hole drilled in a steel block. The change in temperature required for an exact fit is minimum when :

a
only the block is heated
b
both block and pin are heated together
c
both block and pin are cooled together
d
only the pin is cooled

detailed solution

Correct option is A

since coefficient of expansion of steel is less than that of bronze. Hence with small decrease in it's temperature of the  pin made is easy to go inside.

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