Physics Thermodynamics DUHS 2023
PMDC Verified Question 27 of 54
The process in which no external work is performed is called:
A
Adiabatic
B
Isobaric
C
Isochoric
D
Isothermal
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Isochoric
1. Concept:

Thermodynamic work is strictly the product of external pressure and the change in the physical boundaries (volume) of the system.

2. Formula:

$$W = P \Delta V$$

3. Solution:

  • For work to be absolute zero, one of the components of the work equation must be zero.


  • Since absolute pressure \(P\) of a gas is never zero, the volume change \(\Delta V\) must be zero.


  • A process where \(\Delta V = 0\) is termed an Isochoric process (constant volume).


4. Why other options are incorrect:

Isothermal, isobaric, and adiabatic processes all permit the volume of the gas to expand or compress, meaning external work is definitively performed in all of them.

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