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Question

No heat is lost or gained by the system to or from the surroundings but, work W is done on the system. Which of the following statements is correct?
  1. U=W, wall is insulated
  2. U=Q, diathermic walls
  3. U=QW, closed system.
  4. U=Q+W, open system


Solution

The correct option is A U=W, wall is insulated
This is possible for an adiabatic wall or an insulated wall in which, no heat exchange happens. And thus, q=0. Therefore, U=Wadibatic.

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