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Isothermal process occurs very slowly so it is quasi-static and hence it is reversible.

1. The conditions for reversibility must take place infinitely slowly.
2. The temperature of the system must not differ appreciably.
3. There must be complete absence of dissipative forces such as friction, viscosity, electric resistance, etc.
4. All of the above.

Correct answer: All of the above.

Solution

For an isothermal process to be reversible, it must occur quasi-statically (infinitely slowly), maintain negligible temperature difference with the surroundings, and avoid dissipative forces. All these conditions are necessary.

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