Q.

When hot-water is sprinkled on a hotter glass tumbler, it breaks because –

A. glass suddenly expands
B. glass suddenly contracts
C. water evaporates
D. glass reacts chemically with water
Answer» B. glass suddenly contracts
Explanation: If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
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