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Which of the following is false for a thermodynamic system

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The internal energy changes in all process

Work done in adiabatic process is not zero

The change in entropy can be zero

Internal energy and entropy are state functions

answer is A.

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Detailed Solution

1. for isothermal process U= const $\Rightarrow Δ U = 0$
2. W= $\frac{n R}{γ - 1} (T_{1} - T_{2}), W \neq 0$ For adiabatic process
3. U & S depends only on initial and final states, and independent of path
4. S always increases for a process

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