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QPage 46: Q16: HC Verma: Concepts of Physics - Volume 2 Calorimetry Page 46: Q16 Solution: Two bodies at different temperatures are mixed in a…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume that 'total heat' is a conserved state quantity, confusing the transient flow of energy (heat) with the stored energy (internal energy). Remember that heat is not a property of a system; only the total internal energy of the isolated system remains constant.

Two bodies at different temperatures are mixed in a calorimeter. Which of the following quantities remains conserved?

Multiple Choice Options

  • A Sum of the temperatures of the two bodies
  • B Total heat of the two bodies
  • C Total internal energy of the two bodies
  • D Internal energy of each body

Step-by-Step Verified Solution

**Answer:** (c) Total internal energy of the two bodies. **Step-by-Step Explanation:** In a calorimeter, if no heat is lost to the surroundings, the total internal energy of the two bodies is conserved.

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