8. If the amount of heat given to a system be 35 joules and the amount of work done by the system be -15 joules, then the change in the internal energy of the system is
(a) -50 joules (b) 20 joules
(c) 30 joules (d) 50 joules
Ans. d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a