UPSC Prelims 2011 · Question 20 of 100

UPSC Prelims 2011 question on Frozen Lake Bottom Water

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

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

Answer: A. Ice is a bad conductor of heat

Ice acts as an insulator, preventing rapid heat loss from the water below.

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