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Practically, if 10kJ of energy is supplied to a device, how much energy will the device give back?(a) Equal to10kJ(b) Less than 10kJ(c) More than 10kJ(d) Zero

Answer» The correct choice is (b) Less than 10kJ

Easiest explanation: Practically, if 10kJ of energy is supplied to a system, it returns less than the supplied energy because, some of the energy is lost as heat energy, sound energy etc.


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