In which thermodynamic process, volume remains same?
A. Isobaric
B. Isothermal
C. Adiabatic
D. Isochoric

Hint: Let's first understand the concept of thermodynamic process fundamentals in order to answer this question. We know that $P{V^r} = {\text{constant}}$ because of the ideal gas law. Thus $PV = nRT = {\text{constant}}$. This means that for a certain sample of gas, the product of a gas's pressure and volume is constant.

Complete answer:
Let us consider all the four options given one by one: -
1. The isobaric process in thermodynamics is a process during which the pressure of a system remains constant that’s why it is also referred to as a constant-pressure process. $\Delta P = 0$
2. The isothermal process, also known as a constant-temperature process, is a thermodynamic process in which the temperature of a system remains constant $\Delta T = 0$.
3. The adiabatic process in thermodynamics is a process during which there is no heat exchange with the system $P{V^r} = {\text{constant}}$.
4. The isochoric process in thermodynamics is a process during which the volume of a system remains constant that’s why it is also referred to as a constant-volume process $\Delta V = 0$.
5. The system isolates itself from its surroundings by a process known as adiabatic. A thermodynamic system and its environment engage in an adiabatic process when neither heat nor mass of any kind is transferred. Insulation from the environment is, therefore, necessary for the adiabatic process, which is true.

Graphically, an isochoric process can be represented as: -

 Thus, in thermodynamics, volume remains the same in the Isochoric process. Hence, the correct option is (D) Isochoric.

Note: As we know, an isobaric process is one in which the system's pressure remains constant. And when a system's macroscopic attributes, such as temperature and pressure, do not fluctuate over time, it is said to be in thermodynamic equilibrium.