20. In an isothermal process the volume of an ideal gas is halved. One can say that
(a) Internal energy of the system decreases
(b) Work done by the gas is positive
(c) Work done by the gas is negative
(d) Internal energy of the system increases
Answer-c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a