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Question

The temperature of water at the surface of a deep lake is 2C. The temperature of water expected at the bottom is _____.

A
0°C
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B
4°C
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C
-2°C
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D
-4°C
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Solution

The correct option is B 4°C
When temperature of water is raised from 0°C to 4°C, it experiences a decrease in its volume thereby changing it density.

The graph shows the information of density of water at various temperatures. It is observed that, water has the highest density at 4°C.
In the given scenario, since the temperature at the surface is 2°C, implies that water under a deep lake would be 4°C because of its higher density.

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