Q.

In a cyclic process shown in the figure an ideal gas is adiabatically taken from B to A the work done on the gas during the process BA  is 30J, when the gas is taken from AB the heat absorbed by the gas is 20J.

What is the change in internal energy of the gas in the process AB

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a

+20J

b

-30J

c

-20J

d

+30J

answer is C.

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