31. 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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a