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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a