1. Constant volume
  2. Polytropic
  3. Adiabatic
  4. Constant pressure
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1 Answers

Answer: Option 1

By first law of thermodynamics for a system undergoing only expansion work we can write $$\delta Q = dU + PdV$$ For an isochoric process since $$dV=0$$   we can write $$\delta Q = dU.$$

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