UPSC Civil Services 2011 Prelims General Studies Paper I

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The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?

Ice is a bad conductor of heat.
Since the surface of the lake is at the same temperature as the air, no heat is lost.
The density of water is maximum at 4°C.
None of the statements (a), (b) and (c) given is correct.

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