NEET UG 2009 — Physics Thermodynamics

The correct answer is option 1) i.e. In an isochoric process pressure remains constant. CONCEPT: - Thermodynamic process: It is the change in a system from its initial state of thermodynamic equilibrium to the final state of thermodynamic equilibrium. - The various types of thermodynamic processes and their relation with pressure( $(\mathrm{P})$(P) and volume(V) of gas, is as follows: $$\begin{array}{|c|c|} \hline \begin{array}{l} \text{Isobaric process} \end{array} & \begin{array}{l} \text{- It is a process that takes place under constant pressure.} \end{array} \\ \hline \begin{array}{l} \text{Isochoric process} \end{array} & \begin{array}{l} \text{- It is a process where the change in volume is zero.} \\ \text{- As the change in volume is zero, the work done is zero.} \end{array} \\ \hline \begin{array}{l} \text{Isothermal process} \end{array} & \begin{array}{l} \text{- It is a process that takes place under constant temperature.} \end{array} \\ \hline \begin{array}{l} \text{Adiabatic process} \end{array} & \begin{array}{l} \text{- It is a process in which no heat is exchanged between the} \\ \text{system and the surrounding i.e. the system is insulated.} \\ \text{- It is represented mathematically as } \mathrm{PV}= \text{ constant} \end{array} \\ \hline \end{array}$$Isobaric process​Isochoric process​Isothermal process​Adiabatic process​​- It is a process that takes place under constant pressure.​- It is a process where the change in volume is zero.- As the change in volume is zero, the work done is zero.​- It is a process that takes place under constant temperature.​- It is a process in which no heat is exchanged between thesystem and the surrounding i.e. the system is insulated.- It is represented mathematically as PV= constant​​​ EXPLANATION: - An isochoric process is a thermodynamic process that occurs when the change in volume is zero. - Hence the statement 'In an isochoric process pressure remains constant is not true.