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Question 31079
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Kinetic Theory and Thermodynamics: Adiabatic Process MCQ

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Adiabatic ProcessHardQuestion 31079

Question

During adiabatic free expansion of an ideal gas into vacuum, temperature:
  1. A
    Increases
  2. B
    Decreases
  3. C
    Stays same
    Correct
  4. D
    Depends on gas

Correct answer

Stays same

Explanation

Free expansion: no work done (vacuum), no heat exchange. For ideal gas, ΔU = 0 → ΔT = 0. (Real gas: Joule expansion causes cooling due to intermolecular forces.)

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