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Question

Two glass tumblers have been stuck together (one into the other). They can be separated by

placing hot water in the inner tumbler
placing the outer tumbler in hot water
hammering them vigorously
None of the above

A

placing the outer tumbler in hot water

B

None of the above

C

placing hot water in the inner tumbler

D

hammering them vigorously

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Solution

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Two stuck glass tumblers can be separated by placing the other tumbler in hot water. As we know that when tumbler is placed in hot water, heat is being transferred from water to tumbler, and we also know that when glass is heated it expands. And due to this fact tumbler expands.

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