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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

(5)

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