Which statement below regarding the First Law of Thermodynamics ismost correct?

Question

Which statement below regarding the First Law of Thermodynamics ismost correct?
A system can dowork externally only if its internal energy decreases.
The internalenergy of a system that interacts with its environment mustchange.
No matter whatother interactions take place, the internal energy must change if asystem undergoes a heat transfer.
The only changesthat can occur in the internal energy of a system are thoseproduced by non-mechanical forces.
The internalenergy of a system cannot change if the heat transferred to thesystem is equal to the work done by the system.

Explanation / Answer

The last statement is correct. First Law: Q = U + W Here, Q =W; so U the change in internal energy must bezero.

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