Check whether the given assertion and reason and correct. If correct check if the reason is the correct explanation of the assertion.

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Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

(A) is true but (R) is false

answer is B.

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Detailed Solution

When hot water is poured into a thick tumbler its inner surface expands. However, since glass is a bad conductor of heat, the heat does not go to the outer surface and the expansion of the outer surface of the tumbler is quite small. Due to uneven expansion of the outer and inner surfaces, the tumbler breaks. Because the heat will try to escape but the glass would not allow it and in the process ultimately glass breaks down.

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