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

 

Answers (1)

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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