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.

At chemical equilibrium, G will be minimum subjected to the equations of constraint.

A. true
B. false
Answer» B. false
Discussion
2.

If a closed system is in equilibrium, which of the following remains constant?

A. entropy
B. volume
C. internal energy
D. all of the mentioned
Answer» E.
Discussion
3.

For a phase which has only one constituent,

A. chemical potential = n/G
B. chemical potential = 1/(G*n)
C. chemical potential = G*n
D. chemical potential = G/n
Answer» E.
Discussion
4.

The Gibbs-Duhem equation is given by

A. SdT + Vdp – Σ(n)*d(molal chemical potential)
B. -SdT + Vdp – Σ(n)*d(molal chemical potential)
C. SdT + Vdp – Σ(n)*d(molal chemical potential)
D. -SdT – Vdp – Σ(n)*d(molal chemical potential)
Answer» C. SdT + Vdp – Σ(n)*d(molal chemical potential)
Discussion
5.

FOR_A_PHASE_WHICH_HAS_ONLY_ONE_CONSTITUENT,?$

A. chemical potential = n/G
B. chemical potential = 1/(G*n)
C. chemical potential = G*n
D. chemical potential = G/n
Answer» E.
Discussion
6.

THE_GIBBS-DUHEM_EQUATION_IS_GIVEN_BY?$

A. SdT + Vdp – Σ(n)*d(molal chemical potential)
B. -SdT + Vdp – Σ(n)*d(molal chemical potential)
C. SdT + Vdp – Σ(n)*d(molal chemical potential)
D. -SdT – Vdp – Σ(n)*d(molal chemical potential)
Answer» C. SdT + Vdp ‚Äö√Ñ√∂‚àö√ë‚àö¬® ‚âà√≠¬¨¬£(n)*d(molal chemical potential)
Discussion
7.

At chemical equilibrium, G will be minimum subjected to the equations of constraint.$

A. true
B. false
Answer» B. false
Discussion
8.

If a closed system is in equilibrium, which of the following remains constant?$

A. entropy
B. volume
C. internal energy
D. all of the mentioned
Answer» E.
Discussion
9.

For a pure substance existing in a single phase,

A. C=1
B. number of phases = 1
C. f=2
D. all of the mentioned
Answer» E.
Discussion
10.

The Gibbs phase rule for a non-reactive system is given by

A. f = C + (number of phases) + 2
B. f = C – (number of phases) – 2
C. f = C – (number of phases) + 2
D. f = C – (number of phases) – 2
Answer» D. f = C ‚Äö√Ñ√∂‚àö√ë‚àö¬® (number of phases) ‚Äö√Ñ√∂‚àö√ë‚àö¬® 2
Discussion
11.

If the phase of a multi-component system is enlarged, which of the following will happen?

A. U,S and V will increase and T,p and chemical potential will remain same
B. U,S and V will decrease and T,p and chemical potential will remain same
C. U,S and V will increase and T,p and chemical potential will decrease
D. U,S and V will decrease and T,p and chemical potential will increase
Answer» B. U,S and V will decrease and T,p and chemical potential will remain same
Discussion
12.

Chemical potential is an extensive property.

A. true
B. false
Answer» C.
Discussion
13.

The equation written for Gibbs energy can also be written for

A. H
B. F
C. Both of the mentioned
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
14.

An equation in Gibbs energy is be given by

A. dG = Vdp + SdT + Σ(molal chemical potential)*dn
B. dG = Vdp – SdT – Σ(molal chemical potential)*dn
C. dG = Vdp + SdT – Σ(molal chemical potential)*dn
D. dG = Vdp – SdT + Σ(molal chemical potential)*dn
Answer» E.
Discussion
15.

The Gibbs entropy equation is given by

A. TdS = dU – pdV – Σ(molal chemical potential)*dn
B. TdS = dU + pdV + Σ(molal chemical potential)*dn
C. TdS = dU + pdV – Σ(molal chemical potential)*dn
D. TdS = dU – pdV + Σ(molal chemical potential)*dn
Answer» D. TdS = dU ‚Äö√Ñ√∂‚àö√ë‚àö¬® pdV + ‚âà√≠¬¨¬£(molal chemical potential)*dn
Discussion
16.

The molal chemical potential is given by

A. ∂U/∂S
B. ∂U/∂n
C. ∂U/∂V
D. all of the mentioned
Answer» C. ‚Äö√Ñ√∂‚àö‚Ć‚àö√°U/‚Äö√Ñ√∂‚àö‚Ć‚àö√°V
Discussion
17.

If the composition of system does not change, then dU=TdS-pdV .

A. true
B. false
Answer» B. false
Discussion
18.

For a system of variable composition, the internal energy depends on

A. entropy
B. volume
C. moles
D. all of the mentioned
Answer» E.
Discussion