Which one is not an irreversible process?
Correct answer: A. Slow compression of a gas into a cylinder
- A. Slow compression of a gas into a cylinder
- B. Changes due to friction
- C. Explosion
- D. Dissipation of energy
Explanation
The correct answer is Option A: Slow compression of a gas into a cylinder. This is a reversible process because it can be performed in such a way that the system can be returned to its initial state without any net change to the system or surroundings. In contrast, Option B: Changes due to friction are irreversible as energy is lost to heat, which cannot be completely recovered. Option C: Explosion is an irreversible process because it involves a rapid release of energy that cannot be reversed. Lastly, Option D: Dissipation of energy involves energy being spread out in a way that cannot be fully recovered, making it irreversible.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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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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