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Concepts Of Physics MCQ Edition [Volume 2]PhysicsCalorimetry

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

Options

  1. AThe sum of the temperatures of the two bodies
  2. BThe internal energy of each individual body
  3. CThe total internal energy of the two bodies
  4. DThe total heat of the two bodies

Correct answer

C. The total internal energy of the two bodies

Step-by-step solution

A calorimeter acts as an isolated system where no heat exchange takes place with the surroundings. According to the first law of thermodynamics, Q = U + W . Since the system is isolated, the net heat exchange with the surroundings is zero ( Q = 0 ) and no external work is done ( W = 0 ). Therefore, the change in the total internal energy of the system is zero ( U = 0 ). This implies that the total internal energy of the two bodies remains conserved during the mixing process, even though heat flows from the hotter b

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