18. Entropy of a thermodynamic system does not change when this system is used for
(a) Conduction of heat from a hot reservoir to a cold reservoir
(b) Conversion of heat into work isobarically
(c) Conversion of heat into internal energy isochorically
(d) Conversion of work into heat isochorically
Ans. d
(13)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)