The first law of thermodynamics is a statement which implies that:
Correct answer: D. Energy is conserved
- A. No heat enters or leaves the system
- B. The temperature remains constant
- C. All work is mechanical
- D. Energy is conserved
Explanation
The first law of thermodynamics states that energy can neither be created nor destroyed, it is converted from one form to another, therefore the answer will be D
This question appeared on the ETEA MDCAT 2012 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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