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  4. In an isothermal process, there is

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Q. In an isothermal process, there is

JIPMERJIPMER 2014Thermodynamics

Solution:

In an isothermal process, temperature remains constant, i.e., $\Delta T = 0$.
From, $\Delta Q = \Delta U + \Delta W$
$\because \:\:\:\: \Delta U = 0 ,$ $( \because \:\:\: \Delta T = 0)$
Internal energy is constant for an isothermal process.
$ \because \:\:\:\: \Delta Q = \Delta W$
$i.e.$, heat supplied in an isothermal change is used to do work against external surrounding.