Question

In which of the following processes, heat is neither absorbed nor released by a system?
A. Isothermal
B. Adiabatic
C. Isobaric
D. Isochoric

Answer 1

Hint: Understand the definition of all the processes given in the option and you should know how it is dependent on heat, temperature, energy, etc. So, that you can give the answer correctly. The definition of the process should be known, so that the relation between the process and the variables are clear.

Complete answer:
In an isothermal process, the temperature of a system remains constant. In adiabatic processes, there is no transfer of heat or mass between the system and its surroundings. In an isobaric process, the pressure and force exerted is constant, and In an isochoric process, the volume of a closed system remains constant.
From the above statements you can see that isothermal and adiabatic processes are the only 2 processes that are related to temperature and heat and that also in adiabatic processes there is no exchange of heat.

Therefore, the correct answer is Option (B).

Additional Information:
An isothermal process is a thermodynamic process in which the temperature of a system remains constant. The transfer of heat into or out of the system happens so slowly that thermal equilibrium is maintained.
An adiabatic process is a type of thermodynamic process which occurs without transferring heat or mass between the system and its surroundings. Unlike an isothermal process, an adiabatic process transfers energy to the surroundings only as work.
An isobaric process occurs at constant pressure. Since the pressure is constant, the force exerted is constant and the work done is given as PΔV. If a gas is to expand at a constant pressure, heat should be transferred into the system at a certain rate. This process is called an isobaric expansion.
An Isochoric process, also called a constant-volume process, an isovolumetric process, or an isometric process, is a thermodynamic process during which the volume of the closed system undergoing such a process remains constant. An isochoric process is exemplified by the heating or the cooling of the contents of a sealed, inelastic container.

Note:
Understand the concept of all the processes mentioned in the options properly, then only you can answer correctly. If the definitions of the process is not clear, then marking the write answer for this question will be difficult. The definition of the process will explain the relation between the process and the variable which will help to reach a solution.