KCET · Physics · Thermodynamics
In thermodynamic processes, which of the following statements is not true?
- A In an isothermal process, the temperature remains constant
- B In an isobaric process, the volume remains constant
- C In an adiabatic process, the system is insulated from the surroundings
- D In an adiabatic process, \(PV^\gamma = \) a constant
Answer & Solution
Correct Answer
(B) In an isobaric process, the volume remains constant
Step-by-step Solution
Detailed explanation
In an isothermal process, the temperature of the system remains constant.
In an isobaric process, the pressure of the system remains constant, not the volume. A process in which the volume remains constant is called an isochoric process.
In an adiabatic process, there is no heat exchange between the system and the surroundings (\(dQ = 0\)), which means the system is thermally insulated. For an ideal gas undergoing a reversible adiabatic process, the relation \(PV^{\gamma} = \text{constant}\) holds true.
Therefore, the statement regarding the isobaric process is incorrect.
Answer: In an isobaric process, the volume remains constant
In an isobaric process, the pressure of the system remains constant, not the volume. A process in which the volume remains constant is called an isochoric process.
In an adiabatic process, there is no heat exchange between the system and the surroundings (\(dQ = 0\)), which means the system is thermally insulated. For an ideal gas undergoing a reversible adiabatic process, the relation \(PV^{\gamma} = \text{constant}\) holds true.
Therefore, the statement regarding the isobaric process is incorrect.
Answer: In an isobaric process, the volume remains constant
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