A gas expands adiabatically, and its temperature decreases. The work done is:
Correct answer: B. Positive
- A. Zero
- B. Positive
- C. Negative
- D. Equal to heat supplied
Explanation
In an adiabatic expansion, the gas does work on the surroundings, so work done by the gas is positive, and its internal energy decreases, leading to a temperature drop.
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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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