Question

Heat produced by friction’ is an example of- (a) reversible process (b) irreversible process (c) isothermal process (d) none of a, b & c

Answer 1

Answer:

(b) irreversible

Explanation:

We will consider four examples of irreversible processes. In the first one, the irreversibility is due to heat caused by a finite temperature difference between the system and its surroundings, considered as a heat reservoir. In the other three examples the irreversibility is caused by friction.

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Answer 2

The change in the energy content of a system is equal to the difference between the energy getting into the system minus the energy getting out of the system. The first law of thermodynamics is the expression of the principle of energy conservation, and it considers energy as a thermodynamic property.