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4. Heat given to a system is 35 joules and work done by the system is 15 joules. The change in the internal energy of the system will be

(a)  – 50 J                                  (b)  20 J

(c)   30 J                                     (d)  50 J

Ans. b

(6)

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12. An ideal gas is taken through the cycle A→ B → C → A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is
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(a)      – 5 J (b)  – 10 J (c)   – 15 J (d)  – 20 J Answer-a (118)

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