Physics Thermodynamics NUMS 2024
PMDC Verified Question 12 of 54
A process in which all the heat energy is used for increasing internal energy of the system is known as:
A
Adiabatic
B
Isobaric
C
Isothermal
D
Isochoric
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

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

If all incoming heat strictly increases internal energy, it means none of the energy is being spent performing mechanical work on the environment.

2. Formula:

$$Q = \Delta U + W \implies Q = \Delta U \quad \text{if } W=0$$

3. Solution:

  • For work to be absolute zero, the system's boundary must not move (i.e., volume remains perfectly constant).


  • A process occurring strictly at constant volume is formally termed an Isochoric process.


  • Therefore, in an isochoric heating process, \(100\%\) of the input heat converts into internal kinetic energy.


4. Why other options are incorrect:

In isobaric, part of the heat does work. In isothermal, all heat does work. In adiabatic, no heat enters at all.

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