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10 20 30 O 20 35 V(dm 3 ) Case - I A P(k Pa) B C D 10 20 30 O 10 40 V(dm 3 ) Case - II A P(k Pa) B C D 5 20 35 O 10 40 V(dm 3 ) Case - III A P(k Pa) B C D 25 An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path A → B → C → D → A as shown in the three cases above. Choose the correct option regarding Δ U.

1. Δ U (Case-III) > Δ U (Case-II) > Δ U (Case-I)
2. Δ U (Case-I) > Δ U (Case-II) > Δ U (Case-III)
3. Δ U (Case-I) > Δ U (Case-III) > Δ U (Case-II)
4. Δ U (Case-I) = Δ U (Case-II) = Δ U (Case-III)

Correct answer: Δ U (Case-I) = Δ U (Case-II) = Δ U (Case-III)

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