In which process, the change in internal energy of the system is zero?
Correct answer: D. Isothermal process
- A. Isochoric process
- B. Isobaric process
- C. Adiabatic process
- D. Isothermal process
Explanation
The correct answer is the isothermal process. In this process, the temperature of the system remains constant, which means there is no change in internal energy, as it is directly proportional to temperature. The heat added to the system is exactly balanced by the work done, keeping the internal energy constant. Other processes such as isochoric, isobaric, and adiabatic can involve changes in temperature or heat exchange, leading to changes in internal energy.
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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