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| 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 | |
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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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