Which of the following statements is correct for any thermodynamic system?
Correct answer: C. Internal energy and entropy are state functions
- A. The internal energy changes in all processes
- B. The change in entropy can never be zero
- C. Internal energy and entropy are state functions
- D. The work done in an adiabatic process is always zero
Explanation
State functions are properties that depend only on the current state of a system, not on the path taken to reach it. Both internal energy (U) and entropy (S) are key examples of state functions in thermodynamics.
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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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