Which of the following statements is correct for any thermodynamic system? (a) The change in entropy can never be zero (b) Internal energy and entropy are state functions (c) The internal energy changes in all processes (d) The work done in an adiabatic process is always zero

Answer: (b). (a) False: entropy change is zero in a reversible adiabatic process. (b) True: U and S depend only on the state. (c) False: Δ U = 0 in an isothermal process of an ideal gas. (d) False: in an adiabatic process Q = 0, but W = -Δ U ≠ 0 in general. So the answer is (b).

Which of the following statements is correct for any thermodynamic… | JEE Main 2004 (AIEEE)

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Heat Engines, Refrigerators & Second Law

Which of the following statements is correct for any thermodynamic system?

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Answer: (b)

(a) False: entropy change is zero in a reversible adiabatic process.
(b) True: $U$ and $S$ depend only on the state.
(c) False: $\Delta U = 0$ in an isothermal process of an ideal gas.
(d) False: in an adiabatic process $Q = 0$ , but $W = -\Delta U \ne 0$ in general.
So the answer is (b).

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