Choose the correct alternative from the following : - Assertion (A) : Glass tumbler breaks in winter when hot water is poured in it. Reason (R) : When hot water is poured, the outer surface of glass expands.
Answer: C. A is true but R is false.
When a winter, hot water is poured in the glass tumbler, its inner surface tends to expand while the outer surface in contact with cold atmosphere does not. This opposite interaction causes the tumbler to break.