For a cyclic process.. u =0 (as internal energy is state function)
that's why w = -q

but work is path function it doesn't depend upon initial n final postion. that's why.. option c is correct Whivh is. w=0

Cyclic Process

A cyclic process is a thermodynamic process that starts and ends at the same state, meaning that the system returns to its initial conditions after completing a full cycle. In a cyclic process, the net change in the internal energy of the system is zero. However, there are certain characteristics that are not true for a cyclic process.

1. Net work done is zero
Contrary to popular belief, the net work done on or by the system during a cyclic process is not necessarily zero. The work done during one complete cycle can be positive, negative, or zero depending on the specific process. For example, in a reciprocating engine, the net work done is positive as the system converts heat energy into mechanical work. On the other hand, in a heat engine, the net work done is negative as the system transfers energy in the form of work to the surroundings.

2. Transfer of heat
Another misconception about cyclic processes is that there is no transfer of heat. However, heat can be both absorbed and released during a cyclic process. In a heat engine, heat is absorbed from a high-temperature reservoir and partially converted into work. The remaining heat is then rejected to a low-temperature reservoir. In contrast, in a refrigeration cycle, heat is absorbed from a low-temperature reservoir and rejected to a high-temperature reservoir. Therefore, cyclic processes involve the transfer of heat between the system and its surroundings.

3. Efficiency is always 100%
Efficiency is a measure of how effectively a system converts input energy into useful work. In a cyclic process, the efficiency is defined as the ratio of the net work output to the heat input. It is a common misconception that the efficiency of a cyclic process is always 100%. However, this is not true. The efficiency of a cyclic process depends on various factors such as the nature of the process, the temperature of the reservoirs, and the efficiency of the engine or device involved. The Carnot cycle, which consists of reversible processes, represents the highest possible efficiency for a heat engine. Other cyclic processes may have lower efficiencies depending on their specific characteristics.

Conclusion
In conclusion, a cyclic process is a thermodynamic process that starts and ends at the same state. While the net change in internal energy is zero, it does not mean that the net work done is zero, there is no transfer of heat, or the efficiency is always 100%. These misconceptions often arise due to oversimplification or misunderstanding of the thermodynamic principles involved in cyclic processes. It is important to have a clear understanding of the characteristics and properties of cyclic processes to accurately analyze and evaluate their thermodynamic behavior.