engineering physics MCQ #2752

The entropy change for a reversible isothermal expansion of an ideal gas is given by

engineering physics MCQ #2752

  1. Question 1

    Q1. The entropy change for a reversible isothermal expansion of an ideal gas is given by

    • A) nR ln(V2/V1)
    • B) nR ln(V1/V2)
    • C) nR(V2 - V1)
    • D) nCv ln(T2/T1)

    Answer: nR ln(V2/V1)

    Explanation: ΔS = nR ln(V2/V1) for an isothermal expansion, derived from the ideal gas law and the definition of entropy.