4. A gas is compressed at a constant pressure of
50 N/m2 from a volume of 10m3 to a volume of 4m3 . Energy of 100 J then added to the gas by heating. Its internal energy is
(a) Increased by 400 J (b) Increased by 200 J
(c) Increased by 100 J (d) Decreased by 200 J
Answer-a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a