Question

Which of the following statements is not true according to the laws of thermodynamics?

Group of answer choices

Work depends upon the themodynamic process.

An equilibrium state of the system can be characterized by its internal energy.

For an isolated system, the internal energy is either constant or increases.

The change in internal energy for a system interacting with the environment is equal to the heat minus the work.

Pressure and volume describe the state of the system.

Answer 1

Ans: (B) For an isolated system internal energy is either constant or increases.

explanation: For isolated system, ∆q=∆w=0. Therefore ∆U = 0. So change in internal energy is zero. So B is wrong.

​​​​​​Explanation of other options:

(A) As work done is a path function so it depends upon the process. So the option is correct.

(C) This can directly be seen from first law.

∆q=∆u+∆w so ∆u=∆q-∆w. So correct

(D) a state can be described by P and V so option is correct.

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