Explore topic-wise MCQs in Thermodynamics.

This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.

1.

For mechanical stability,

A. Cv>0
B. (∂p/∂V)<0, at constant entropy
C. (∂p/∂V)<0, at constant temperature
D. all of the mentioned
Answer» D. all of the mentioned
Discussion
2.

For thermal stability,

A. Cv>0
B. (∂p/∂V)<0, at constant entropy
C. both of the mentioned
D. none of the mentioned
Answer» B. (∂p/∂V)<0, at constant entropy
Discussion
3.

Which of the following is true for a system at equilibrium?

A. S=Smax and ∂S=0
B. F=Fmin and ∂F=0
C. G=Gmin and ∂G=0
D. all of the mentioned
Answer» E.
Discussion
4.

If a system is stable to small but not large disturbances, it is said to be in metastable equilibrium.

A. true
B. false
Answer» B. false
Discussion
5.

WHICH_OF_THE_FOLLOWING_IS_TRUE_FOR_A_SYSTEM_AT_EQUILIBRIUM??$

A. S=Smax and ∂S=0
B. F=Fmin and ∂F=0
C. G=Gmin and ∂G=0
D. all of the mentioned
Answer» E.
Discussion
6.

For mechanical stability,$

A. Cv>0
B. (∂p/∂V)<0, at constant entropy
C. (∂p/∂V)<0, at constant temperature
D. all of the mentioned
Answer» D. all of the mentioned
Discussion
7.

For thermal stability,$

A. Cv>0
B. (∂p/∂V)<0, at constant entropy
C. both of the mentioned
D. none of the mentioned
Answer» B. (‚Äö√Ñ√∂‚àö‚Ć‚àö√°p/‚Äö√Ñ√∂‚àö‚Ć‚àö√°V)<0, at constant entropy
Discussion
8.

For magnetic cooling, ____ salt is used.

A. diamagnetic
B. paramagnetic
C. both of the mentioned
D. none of the mentioned
Answer» C. both of the mentioned
Discussion
9.

The third law is a fundamental law of nature and cannot be proved.

A. true
B. false
Answer» B. false
Discussion
10.

For total stability,

A. Cv>0
B. (∂p/∂V)<0, at constant entropy
C. (∂p/∂V)<0, at constant temperature
D. all of the mentioned
Answer» E.
Discussion
11.

If a system is stable to small but not large disturbances, it is said to be in metastable equilibrium?

A. true
B. false
Answer» B. false
Discussion
12.

For a system to be in a state of neutral equilibrium,

A. dS=dG=dF=0
B. dS=0, dG=dF<0
C. dS=0, dG=dF>0
D. none of the mentioned
Answer» B. dS=0, dG=dF<0
Discussion
13.

What is the criterion of stability?

A. dG<0, dF<0, dS<0
B. dG<0, dF<0, dS>0
C. dG>0, dF>0, dS>0
D. dG>0, dF>0, dS<0
Answer» E.
Discussion
14.

A system is said to be in a state of unstable equilibrium when

A. dG<0, dF<0, dS<0
B. dG<0, dF<0, dS>0
C. dG>0, dF>0, dS>0
D. dG>0, dF>0, dS<0
Answer» C. dG>0, dF>0, dS>0
Discussion
15.

If the constraints are constant p and T, then the Gibbs function of a system decreases.

A. true
B. false
Answer» B. false
Discussion
16.

Which constraints must be imposed on system to make the Helmholtz function decrease?

A. constant T and p
B. constant U and T
C. constant U and V
D. constant T and V
Answer» E.
Discussion
17.

The entropy of an isolated system always ____ and reaches ____ when equilibrium is reached.

A. remains constant, maximum
B. decreases, minimum
C. increases, maximum
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
18.

For an isolated system,

A. dS<0
B. dS>0
C. dS=0
D. none of the mentioned
Answer» C. dS=0
Discussion