Physics Thermodynamics NUMS 2022
PMDC Verified Question 43 of 54
The thermodynamics process during which the pressure is kept constant is called:
A
Adiabatic process
B
Isothermal process
C
Isochoric process
D
Isobaric process
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Isobaric process
1. Concept:

Different thermodynamic processes are characterized by the state variable (P, V, T, Q) that is artificially or naturally constrained to remain unchanged.

2. Formula:

$$\Delta P = 0$$

3. Solution:

  • The prefix 'iso-' means equal or unchanged.


  • The root 'baric' relates to pressure (e.g., barometer, bars).


  • Therefore, a process strictly operating under a fixed, constant pressure is termed an Isobaric process.


4. Why other options are incorrect:

Isochoric locks volume. Isothermal locks temperature. Adiabatic locks heat transfer. None of these guarantee constant pressure.

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