Thermodynamics Questions and Answers – The Property of Entropy

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This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “The Property of Entropy”.

1. Integral of dQ/T is independent of reversible path connecting between two points.
a) true
b) false
View Answer

Answer: a
Explanation: For two reversible paths, dQ/T doesn’t depend on the path taken.
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2. Integral of dQ/T of a reversible path is given by
a) Si-Sf
b) Sf-Si
c) Si+Sf
d) -Si-Sf
View Answer

Answer: b
Explanation: Integral of dQ/T is = Sf-Si where i=initial equilibrium state and f=final equilibrium state.

3. Entropy is a
a) path function, intensive property
b) path function, extensive property
c) point function, intensive property
d) point function, extensive property
View Answer

Answer: d
Explanation: Fact about entropy and unit of entropy is J/K.
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4. Specific entropy is given by( where m is the mass)
a) Sm
b) m/S
c) S/m
d) none of the mentioned
View Answer

Answer: c
Explanation: s=S/m with unit J/kg K.

5. For any process which is undergone by a system
a) dQ/T>=ds
b) dQ/T<=ds
c) dQ/T≠ds
d) none of the mentioned
View Answer

Answer: b
Explanation: For any process dQ/T<=ds and this comes from Clausius theorem.
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6. For a reversible process,
a) dS=dQ/T
b) dS>dQ/T
c) dS<dQ/T
d) none of the mentioned
View Answer

Answer: a
Explanation: For a reversible process, dQ/T is equal to the net change in entropy.

7. For an irreversible process,
a) dS=dQ/T
b) dS>dQ/T
c) dS<dQ/T
d) none of the mentioned
View Answer

Answer: b
Explanation: For a irreversible process, change in entropy is greater than dQ/T.
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8. For two different paths between same two points, entropy change is
a) depends on path taken
b) different
c) same
d) none of the mentioned
View Answer

Answer: c
Explanation: This is because entropy is a property.

9. For the general case, we can write
a) S2-S1<=dQ/T for a path
b) S2-S1>=dQ/T for a path
c) S2-S1≠dQ/T for a path
d) none of the mentioned
View Answer

Answer: b
Explanation: The equality sign holds good for a reversible process and the inequality sign for an irreversible process.
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10. When two equilibrium states are infinitesimally near,
a) dQ/T=dS
b) dQ/T>dS
c) dQ/T<dS
d) none of the mentioned
View Answer

Answer: a
Explanation: dS is an exact differential because S is a point function and a property.

Sanfoundry Global Education & Learning Series – Thermodynamics.
To practice all areas of Thermodynamics, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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