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Thermodynamics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsThermodynamics1 Mark
Question
Assertion : The heat supplied to a system is always equal to the increase in its internal energy.
Reason : When a system changes from one thermal equilibrium to another, some heat is absorbed by it.
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Answer

(d) According to first law of thermodynamics, $\Delta Q=\Delta U+\Delta W=\Delta U+P \Delta V$. If heat is supplies in such a manner that volume does not change $\Delta V=0$ i.e., isochoric process, then whole of the heat energy supplied to the system will increaseinternal energy only. But, in any other process it is not possible.Also heat may absorbed or evolved when state of thermal equilibrium changes.

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