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QPage 46: Q21: HC Verma: Concepts of Physics - Volume 2 Calorimetry Page 46: Q21 Solution: The temperature of a solid object is observed to be constant…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume a steady temperature means no heat transfer, overlooking that during a phase change heat can be added or removed while $\Delta T=0$; the energy goes into changing state ($q=mL$), not temperature.

The temperature of a solid object is observed to be constant during a period. In this period:

Multiple Choice Options

A heat may have been supplied to the body
B heat may have been extracted from the body
C no heat is supplied to the body
D no heat is extracted from the body

Step-by-Step Verified Solution

**Answer:** a), b) are possible. **Step-by-Step Explanation:** If temperature is constant, heat may have been supplied (during phase change) or extracted (during reverse phase change).

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