31. During an isothermal expansion of an ideal gas
(a) Its internal energy decreases
(b) Its internal energy does not change
(c) The work done by the gas is equal to the quantity of heat absorbed by it
(d) Both (b) and (c) are correct
Ans. d
(15)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)