If $Q , E$ and $W$ denote respectively the heat added, change in internal energy and the work done by a closed cycle process, then
AIPMT 2008, Easy
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Internal energy depends only on the initial and final states of temperature and not on the path. In a cyclic process, as initial and final states are the same, change in internal energy is zero. Hence $E$ is $\Delta U$, the change in internal energy.
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