GyanGram
ATTEMPT · SCIENCE & TECHNOLOGY · PRELIMS 2011
The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the re…
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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?
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• Correct Answer: C
• Water reaches maximum density at 4°C; denser water sinks to bottom while colder, less dense water stays at surface and freezes.
• Ice being a bad conductor is true but secondary; anomalous expansion of water is the primary reason.
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