Q. In a closed system, if the internal energy increases, what must happen to the heat and work?
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A.
Heat must be added or work must be done on the system
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B.
Heat must be removed or work must be done by the system
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C.
Both heat and work must be removed
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D.
Neither heat nor work affects internal energy
Solution
In a closed system, if the internal energy increases, it means that heat must be added or work must be done on the system.
Correct Answer:
A
— Heat must be added or work must be done on the system
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Q. What is the main advantage of using a Carnot engine?
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A.
It operates at maximum efficiency
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B.
It is easy to construct
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C.
It requires no fuel
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D.
It can operate in any environment
Solution
The main advantage of using a Carnot engine is that it operates at maximum efficiency, as it is an idealized engine.
Correct Answer:
A
— It operates at maximum efficiency
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