12. Find the change in internal energy of the system when a system absorbs 2 kilocalorie of heat and at the same time does 500 joule of work
(a) 7900 J (b) 8200 J
(c) 5600 J (d) 6400 J
Ans. a
(7)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)