Thermodynamic Potential MCQ Level – 2

# Thermodynamic Potential MCQ Level – 2

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## 10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Thermodynamic Potential MCQ Level – 2

Thermodynamic Potential MCQ Level – 2 for IIT JAM 2023 is part of Topic wise Tests for IIT JAM Physics preparation. The Thermodynamic Potential MCQ Level – 2 questions and answers have been prepared according to the IIT JAM exam syllabus.The Thermodynamic Potential MCQ Level – 2 MCQs are made for IIT JAM 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Thermodynamic Potential MCQ Level – 2 below.
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Thermodynamic Potential MCQ Level – 2 - Question 1

### In a pressure cooker, the vapour pressure is greater than 1 atm. Under such condition, the boiling temperature of water will be Select one:

Detailed Solution for Thermodynamic Potential MCQ Level – 2 - Question 1

From Claussius-Clapeyron eauation on boiling V2 > V1 Hence if we raise pressure above 1 atm the boiling point will also increase and will be higher than 373 K.
The correct answer is: Higher than 373 K

Thermodynamic Potential MCQ Level – 2 - Question 2

### On a p-T graph, the curve which connects points at which vapour (v) and solid (s) exists in equilibrium called Select one:

Detailed Solution for Thermodynamic Potential MCQ Level – 2 - Question 2

Sublimation curve connects points at which vapour and solid exists in equilibrium.
The correct answer is: Sublimation curve

Thermodynamic Potential MCQ Level – 2 - Question 3

### In one of the Maxwell’s relations equals Select one:

Detailed Solution for Thermodynamic Potential MCQ Level – 2 - Question 3

From Maxwell’s equations The correct answer is: Thermodynamic Potential MCQ Level – 2 - Question 4

Entropy of a system having average energy E and partition function Z is defined as
Select one:

Detailed Solution for Thermodynamic Potential MCQ Level – 2 - Question 4

F = –kT ln Z   = k[ln Z – βE]
The correct answer is: S = k[ln(Z) – βE]

Thermodynamic Potential MCQ Level – 2 - Question 5

Helmholtz free energy, F = U – TS. Which relation holds true? (where U = Internal energy; S = Entropy)
Select one:

Detailed Solution for Thermodynamic Potential MCQ Level – 2 - Question 5

F = U – TS
⇒ dF = dU – TdS – SdT
dF = –pdV – SdT ...(1)
take V constant take T constant The correct answer is: Thermodynamic Potential MCQ Level – 2 - Question 6

Which of the following is true with regards to critical point?
Select one:

Detailed Solution for Thermodynamic Potential MCQ Level – 2 - Question 6

Critical point is that point on vapourization curve at which liquid and vapour phase have same density and above this temperature, a gas cannot be liquified by increasing the pressure.
The correct answer is: Above critical point, a gas cannot be liquified

Thermodynamic Potential MCQ Level – 2 - Question 7

Helmholtz free energy function and internal energy U are related as
Select one:

Detailed Solution for Thermodynamic Potential MCQ Level – 2 - Question 7

F = U – TS differentiating w.r.t. ‘T’ keeping V constant, dW = 0
⇒dU = dQ The correct answer is: Thermodynamic Potential MCQ Level – 2 - Question 8

Which of the following relations between internal energy U and the canonical partition function Z is true?
Select one:

Detailed Solution for Thermodynamic Potential MCQ Level – 2 - Question 8

Internal energy  Energy of the system in the ith state the partition function    Thus,  The correct answer is: Thermodynamic Potential MCQ Level – 2 - Question 9

Consider two level question system with energies ε1 = 0, ε2 = ε, The Helmholtz free energy of the system is given by
Select one:

Detailed Solution for Thermodynamic Potential MCQ Level – 2 - Question 9   The correct answer is: Thermodynamic Potential MCQ Level – 2 - Question 10

The boiling point of water will decrease as we go to a higher altitude because
Select one:

Detailed Solution for Thermodynamic Potential MCQ Level – 2 - Question 10

As we go to a higher altitude, the pressure decreases and from ClaussiusClapeyron equation Since dp is negative dT has to be negative hence boiling point decreases.
The correct answer is: Pressure decreases

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