1.

The `P - V` diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from `A rarr B rarr C is 30 J` and `40 J` heat is given to the system. The change in internal energy between `A and C` is A. 50 JB. 60 JC. 30 JD. 10 J

Answer» Correct Answer - A
`U_(A) =0, U_(B) =20 U_(C) =?`
`triangleQ_(BC) = 30`
`triangleQ_(C) = triangleU_(BC) =U_(C)-U_(B) = 30`
`U_(C) =U_(B) + 30 =50`


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