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

In which process the internal energy of a system remains constant?
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Answer :

Isothermal
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According to first law of thermodynamics  (a) work done by a system is equal to heat transferred by the system  (b) total internal energy of a system during a process remains constant  (c) internal energy, enthalpy and entropy during a process remain constant  (d) total energy of a system remains constant

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