In which of the process the internal energy of the system remains constant ?

Adiabatic

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Isochoric

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Isobaric

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Isothermal

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Solution

The correct option is C Isothermal
The internal energy of a system is a function of temperature and hence any change in temperature leads to a change in internal energy.
In an iso-thermal system, the temperature is constant. Hence, the internal energy of the system remains constant.
In all other options, there is a change in temperature. So, internal energy varies.

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