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Question

Based on the first law of thermodynamics, which one of the following is correct ?


A
For an isochoric process, E = -Q
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B
For an adiabatic process, E = -Q
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C
For an isothermal process, E = -Q
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D
For an cyclic process, W = -Q
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Solution

The correct option is A $$\text{For an cyclic process, W = -Q}$$

When a system returns to its original state after completing a series of changes, then it is known that a cycle is completed. This process is known as cyclic process. In a cyclic process the initial and the final state is same. As the internal energy U of the system depends only on the state of the system so in a cyclic process the net change of internal energy, ∆U will be equal to zero i.e. ∆U = 0. Hence from the first law (∆U = Q+W)

Hence, W = – Q


Physics

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