Q1: In an isochoric process,

ANS:C - no mechanical work is done by the system.

In an isochoric process:

• There is no transfer of mass and energy: This statement is incorrect. In an isochoric process, there can still be a transfer of energy in the form of heat, even though there is no change in volume. The system may exchange heat with its surroundings, leading to changes in internal energy without any change in volume.
• Free expansion of an ideal gas occurs: This statement is incorrect. Isochoric processes specifically involve no change in volume. Free expansion of an ideal gas occurs in an isobaric process, where the pressure remains constant while the volume changes.
• No mechanical work is done by the system: This statement is incorrect. While there is no change in volume (and thus no volume work) in an isochoric process, the system can still do mechanical work in other forms, such as electrical work or flow work. Additionally, external forces acting on the system may perform mechanical work on it.