42. If heat given to a system is 6 kcal and work done is 6 kJ. Then change in internal energy is
(a) 19.1 kJ (b) 12.5 kJ
(c) 25 kJ (d) Zero
Ans. a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a