# Which of the following is incorrect regarding the first law of thermodynamics? Option 1) It introduces the concept of the internal energy Option 2) It introduces the concept of entropy Option 3) It is not applicable to any cyclic process Option 4) It is a restatement of the principle of conservation of energy

As we learnt in

First law of Thermodynamics -

Heat imported to a body in is in general used to increase internal energy and work done against external pressure.

- wherein

$dQ= dU+dW$

and

Second Law of Thermodynamics -

Planck's Statement

- wherein

It is impossible to extract heat from single body and convert whole into work.

and

Entropy -

It is a measure of disorder of molecular motion of a system.

- wherein

Greater is disorder greater is entropy

$dS= \frac{dQ}{T}$

The concept of entropy is introduced in second law of thermodynamics.

First law dealt with internal energy, work and heat energy.

It is a statement of first law of thermodynamics.

Correct option is 2.

Option 1)

It introduces the concept of the internal energy

This option is incorrect.

Option 2)

It introduces the concept of entropy

This option is correct.

Option 3)

It is not applicable to any cyclic process

This option is incorrect.

Option 4)

It is a restatement of the principle of conservation of energy

This option is incorrect.

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