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QPages 11-12: Q10: HC Verma: Concepts of Physics - Volume 2 Heat and Temperature Pages 11-12: Q10 Solution: The temperature of water at the surface of a deep lake is 2�C.…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently ignore that pure water reaches maximum density at $4^circ\text{C}$, so they assume the lake’s temperature is uniform or varies linearly with depth. Remember that colder water ($<4^circ\text{C}$) is less dense and stays atop, while the denser $4^circ\text{C}$ layer sinks to the bottom, giving the bottom temperature $4^circ\text{C}$ regardless of the surface reading.

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

Multiple Choice Options

  • A 0 �C
  • B 2 �C
  • C 4 �C
  • D 6 �C

Step-by-Step Verified Solution

**Answer:** (c) 4�C. **Step-by-Step Explanation:** In a deep lake, the surface is at 2�C (below 4�C). Water has maximum density at 4�C. The denser water at 4�C sinks to the bottom, while the less dense water at 2�C stays at the surface. Hence, the temperature at the bottom is 4�C.

All Questions in this Chapter

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