Question

Which of the following statement is correct for any thermodynamics system ? [AIEEE :- 2004]

(a) The internal energy changes in all process .
(b) Internal energy and entropy are state functions .
(c) The change in entropy can never be zero
(d) the work done in an adiabatic process is always zero ​

Answer 1

Answer:

(b) Internal energy and entropy are state functions is the answer

Explanation:

Internal Energy : It is energy possed by the system due to molecular motion and molecular configuration.

- wherein

For an ideal gas there is no molecular attraction hence Vp=0.

Internal energy changes

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Answer 2

Explanation:- ∵ Internal energy doesn't change in isothermal process .

∵∆S can be 0 for adiabatic process .

∵Work done in adiabatic process may be non zero .

But , we know that internal energy and entropy doesn't depend upon path , it only depends upon the current equiblrium thermodynamics state of system .

∴ Option (b) is correct .