9. A system is given 300 calories of heat and it does 600 joules of work. How much does the internal energy of the system change in this process (J = 4.18 joules/cal)
(a) 654 Joule (b) 156.5 Joule
(c) – 300 Joule (d) – 528.2 Joule
Ans. a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a