Second Law Statements
According to the Second Law of Thermodynamics, which of the following processes are forbidden?
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About This Question
- Subject
- physics
- Chapter
- thermodynamics
- Topic
- second law statements
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
All of these
The Second Law of Thermodynamics has multiple equivalent statements that highlight fundamental limits:
- Clausius Statement: Heat cannot spontaneously flow from a colder body to a hotter body without external work.
- Kelvin-Planck Statement: It is impossible to construct a heat engine that operates in a cycle and converts all the heat absorbed from a single reservoir into work.
- Entropy Statement: The total entropy of an isolated system can never decrease over time; it can only stay constant (reversible) or increase (irreversible). Violation of any of these would violate the Second Law.
This medium difficulty physics question is from the chapter thermodynamics, covering the topic of second law statements. It appeared in the 2025 exam.
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