Thermodynamic Potential MCQ Level – 2
10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Thermodynamic Potential MCQ Level – 2
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In a pressure cooker, the vapour pressure is greater than 1 atm. Under such condition, the boiling temperature of water will be
Select one:
Select one:
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
On a p-T graph, the curve which connects points at which vapour (v) and solid (s) exists in equilibrium called
Select one:
Select one:
Sublimation curve connects points at which vapour and solid exists in equilibrium.
The correct answer is: Sublimation curve
In one of the Maxwell’s relations 
equals
Select one:
equalsSelect one:
From Maxwell’s equations
The correct answer is: 
Entropy of a system having average energy E and partition function Z is defined as
Select one:
F = –kT ln Z
= k[ln Z – βE]
The correct answer is: S = k[ln(Z) – βE]
Helmholtz free energy, F = U – TS. Which relation holds true? (where U = Internal energy; S = Entropy)
Select one:
F = U – TS
⇒ dF = dU – TdS – SdT
dF = –pdV – SdT ...(1)
take V constant
take T constant
The correct answer is: 
Which of the following is true with regards to critical point?
Select one:
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
Helmholtz free energy function and internal energy U are related as
Select one:
F = U – TS
differentiating w.r.t. ‘T’
keeping V constant, dW = 0
⇒dU = dQ
The correct answer is: 
Which of the following relations between internal energy U and the canonical partition function Z is true?
Select one:
Internal energy 
Energy of the system in the ith state the partition function
Thus, 
The correct answer is: 
Consider two level question system with energies ε1 = 0, ε2 = ε, The Helmholtz free energy of the system is given by
Select one:
The correct answer is: 
The boiling point of water will decrease as we go to a higher altitude because
Select one:
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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