Regarding the Second Law of Thermodynamics, which practical consequence is correct?

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1. Regarding the Second Law of Thermodynamics, which practical consequence is correct?

It implies no heat engine can ever be more than 100 percent efficient

It implies internal energy is always exactly conserved in every process

It implies temperature has no upper limit

It implies heat can freely flow in either direction between two bodies

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A direct consequence of the Second Law is that no real heat engine can convert all its input heat into useful work — some energy is always lost, keeping efficiency below 100 percent.