In the following figures (a) to (d), variation of volume with change of pressure along the path ABCDA is shown. Change in internal energy of the gas will be -

positive in all cases from (a) to (d)

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positive in cases (a), (b) and (c), but zero in case (d)

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negative in cases (a), (b) and (c), but zero in case (d)

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zero in all the four cases

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Solution

The correct option is D zero in all the four cases
Internal energy is a state function.
That is, it depends only on the initial and final states of the gas.
In a cyclic process, initial state coincides with final state.
So, change in internal energy $Δ U = 0$ in all four cases.

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In the following figures (a) to (d), variation of volume with change of pressure along the path ABCDA is shown. Change in internal energy of the gas will be -

The correct option is D zero in all the four casesInternal energy is a state function. That is, it depends only on the initial and final states of the gas. In a cyclic process, initial state coincides with final state. So, change in internal energy ΔU=0 in all four cases.

The correct option is D zero in all the four cases
Internal energy is a state function.
That is, it depends only on the initial and final states of the gas.
In a cyclic process, initial state coincides with final state.
So, change in internal energy $Δ U = 0$ in all four cases.