Q147 / 150 · MHT CET 2025 (26 Apr Shift 2) · Physics

In the thermodynamic processes, which of the following statements is NOT true?

  • A
    In an isothermal process, the temperature remains constant.
  • B
    In an adiabatic process, the system is insulated from surroundings.
  • Correct answer
    C
    In an isochoric process, pressure remains constant.
  • D
    In an adiabatic process, $\mathrm{PV}^\gamma=$ constant.

Solution

The analysis focuses on identifying the false statement among thermodynamic process definitions.

Isothermal processes maintain constant temperature ($T = \text{constant}$), confirming truth for option A.

Adiabatic processes involve no heat exchange ($Q = 0$), validating option B.

Isochoric processes are defined by constant volume ($V = \text{constant}$), whereas constant pressure defines isobaric processes ($P = \text{constant}$). Option C incorrectly conflates these, making it false.

For adiabatic processes involving ideal gases, $PV^{\gamma} = \text{constant}$ holds true, supporting option D.

The false statement is option C.

Hence, the correct answer is option: 'C'.

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