Which of the following processes is reversible?
Correct answer: D. Isothermal compression
- A. Transfer of heat by radiation
- B. Electrical heating by nichrome wire
- C. Transfer of heat by conduction
- D. Isothermal compression
Explanation
Option D is correct as "isothermal expansion or compression" is reversible so long as the piston motion is sufficiently slow such that at each instant the gas temperature and pressure are uniform and conform to ideal gas law.
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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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