In thermodynamic processes which of the following statements is not true?

1. In an adiabatic process $\mathrm{PV}^\gamma=$ constant
2. In an adiabatic process the system is insulated from the surroundings
3. In an isochoric process pressure remains constant
4. In an isothermal process the temperature remains constant

Solution

The correct answer is option (2)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 state of thermodynamic equilibrium. - The various types of thermodynamic processes and their relation with pressure \((\mathrm{P})\) and volume \((\mathrm{V})\) of gas is is follows: \(\begin{array}{|c|l|} \hline \text { Isobaric process } & \text { - It is a process that takes place under constant pressure. } \\ \hline \text { Isochoric process } & \begin{array}{l} \text { - It is a process where the change in volume is zero. } \\ \text { - As the change in volume is zero, the work done is zero. } \end{array} \\ \hline \text { Isothermal process } & \text { - It is a process that takes place under constant temperature. } \\ \hline \text { Adiabatic process } & \begin{array}{l} \text { - It is a process in which no heat is exchanged between the } \\ \text { system and the surrounding i.e. the system is insulated. } \\ \text { - It is represented mathematically as PV }=\text { constant } \end{array} \\ \hline \end{array}\) 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.

Asked in: MHT CET Full Test 8

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