Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) B.Sc (Non-Medical) 2020 March Previous Question Papers
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Sc (Non Medical) (2018 Batch) (Sem.?3)
THERMAL PHYSICS
Subject Code : BSNM-304-18
M.Code : 76903
Time : 3 Hrs. Max. Marks : 50
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying ONE marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
a) Define first law of thermodynamics and give its physical significance.
b) State principle of increase of entropy. What does it conclude?
c) A Carnot?s engine whose low temperature reservoir is at 7?C has an efficiency of
40%. To increase the efficiency to 50% by how many degrees should the temperature
of the source be increased?
d) Write four Maxwell?s thermodynamic relation in terms of thermodynamic potentials.
e) Differentiate between Joule-Thomson and adiabatic cooling.
f) What do you understand by adiabatic demagnetization?
g) What do you understand by accessible and inaccessible energy state of a statistical
system?
h) What the law of thermodynamics says about thermal equilibrium between two
thermodynamic systems?
i) Mention the statistical interpretation of second law of thermodynamics.
j) Differentiate between bosons and fermions.
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1 | M-76903 (S105)-1539
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Sc (Non Medical) (2018 Batch) (Sem.?3)
THERMAL PHYSICS
Subject Code : BSNM-304-18
M.Code : 76903
Time : 3 Hrs. Max. Marks : 50
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying ONE marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
a) Define first law of thermodynamics and give its physical significance.
b) State principle of increase of entropy. What does it conclude?
c) A Carnot?s engine whose low temperature reservoir is at 7?C has an efficiency of
40%. To increase the efficiency to 50% by how many degrees should the temperature
of the source be increased?
d) Write four Maxwell?s thermodynamic relation in terms of thermodynamic potentials.
e) Differentiate between Joule-Thomson and adiabatic cooling.
f) What do you understand by adiabatic demagnetization?
g) What do you understand by accessible and inaccessible energy state of a statistical
system?
h) What the law of thermodynamics says about thermal equilibrium between two
thermodynamic systems?
i) Mention the statistical interpretation of second law of thermodynamics.
j) Differentiate between bosons and fermions.
2 | M-76903 (S105)-1539
SECTION-B
2. Discuss the equivalence of Kelvin and Clausius statements of second law of
thermodynamics.
3. Derive the relationship between Thermodynamic and gas scale of temperature.
4. Use Maxwell?s thermodynamic relation to derive Clausius-Clapeyron equation.
5. Explain in detail microstates and macrostates for a system of non-interacting particles.
6. Deduce Planck?s radiation law by applying Bose-Einstein statistical approach to a
radiating system.
SECTION-C
7. a) Derive the expression for entropy of a perfect gas.
b) Write a short note on the production and measurement of very low temperatures.
8. Explaining the concept of probability and thermodynamic probability, derive the
expression for probability distribution. Also show its narrowing with increasing number
of particles.
9. a) Explain in detail the M-B, B-E and F-D distribution functions and conditions for their
applications.
b) Calculate the surface temperatures of the sun and moon. Given that wavelength of
maximum intensity emission ( ?
m
) is 573? and 14 ?m for sun and moon
respectively.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 02 April 2020