In which process is the net work done zero?

Explanation

The correct answer is Isochoric. In an isochoric process, the volume of the system remains constant, which means there is no displacement and hence no work done (W = PΔV = 0). This is unlike other processes where changes in volume might lead to work being done or absorbed by the system. In a cyclic process, the net work done over a complete cycle can be non-zero as the system may perform work on the surroundings. In free expansion, although there is no external force opposing the expansion and therefore no actual work is done, it is not considered a thermodynamic process with zero net work in the same context. In an adiabatic process, even though there is no heat exchange, work is done as the internal energy changes.