McqMate
| Q. |
Pipelines in cold countries often burst in winter, because – |
| A. | Water freezes and expands in its volume |
| B. | Temperature of ice is less than that of water |
| C. | Pipelines contract in their volume |
| D. | Pipelines expand due to freezing |
| Answer» A. Water freezes and expands in its volume | |
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Explanation: Water expands on freezing. When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%. The fact that water expands upon freezing causes icebergs to float. |
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