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33. In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules gives out 20 J of heat and 10 J of work is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be

(a)  30 J                  (b)  20 J

(c) 60 J                  (d)   40 J

Ans. c

(5)

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