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JEE Main · 2004 · 24 Apr 2004 · Offline · Heat & Thermodynamics

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Which of the following statements is correct for any thermodynamic system?
(A) The internal energy changes in all processes.
(B) Internal energy and entropy are state functions.
(C) The change in entropy can never be zero.
(D) The work done in an adiabatic process is always zero.
  1. (A)The internal energy changes in all processes.
  2. (B)Internal energy and entropy are state functions.✓ Correct
  3. (C)The change in entropy can never be zero.
  4. (D)The work done in an adiabatic process is always zero.

Answer: (B)

Solution

Internal energy and entropy depend only on the state a system is in, not on the path by which it got there, so both are state functions. Internal energy does not change in every process, the entropy change can indeed be zero in a reversible adiabatic process, and an adiabatic process does involve work since with the first law gives . The sound statement is that internal energy and entropy are state functions.

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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