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Total No. of Questions : 11
[Total No. of Printed Pages : 7
KL–556
M. Sc. (Sem. IV)
Regular/ATKT/Old ATKT/EX
Examination - May, 2023
PHYSICS
Paper I
Condensed Matter Physics
Time : 3 Hours
Maximum Marks : 85
Note : Attempt all questions.
Section A
5x2=10
Objective Type Questions
1. Choose the correct answer :
(i) Some metals lose all resistivity abruptly and completely at some low temperature above OK. This phenomenon is called :
(a) Semiconductor
(b) Superconductivity
(c) Ferroelectricity
(d) Piezoelectricity
(ii) For which of the following is magnetic susceptibility negative ?
(a) Paramagnetic and Ferromagnetic materials
(b) Paramagnetic materials only
(c) Ferromagnetic materials only
(d)√ Diamagnetic materials
(iii) The defect that occurs due to displacement of an ion is known as :
(a) Vacancy defect
(b) Schottky defect
(c) Frenkel defect
(d) Interstitial defect
(iv) Hall effect can be used to measure :
(a) Electric field intencity
(b) Magnetic field intensity
(c) Carrier concentration
(d) None of the above
(v) Which property of nanomaterials make them suitable to be used for elimination of pollutants ?
(a) High purity
(b) Better thermal conductivity
(c) Enhanced chemical activity
(d) Small size
Section B
5x5=25
Short Answer Type Questions
2. What are the factors affecting superconductivity ?
Or
Explain critical temparature.
Section C
10x5=50
Long Answer Type Questions
3. Describe ferri and Anti-ferrimagnetic materials.
Or
What is Curie-Weiss' law of magnetic susceptibility ? Describe it.
4. What are F-centres ? How are they formed ?
Or
Explain elastic energy dislocation.
5. Explain quantum size effect in thin film.
Or
Give condition for accurate determination of step height.
6. Define and give the properties of nanostructured material.
Or
Describe electronic, mechanical, thermal and phonon properties of nanomaterials.
7. What are high TC superconductors ? Explain their properties with example.
Or
Give the concept of superconducting state and explain thermodynamics of superconducting transition.
8. Explain Magnetic domain and Bloch wall energy.
Or
Describe in detail Heisenberg's model and molecular field theory.
9. Describe imperfection in atomic packing, interstitial of crystals. Also explain Shottky and Frankel defect in it.
Or
Explain edge dislocation and screw dislocation in plastic deformation.
10. Discuss Hall coefficient in thin film.
Or
Explain electrical conductivity of thin film. Derive expression for it.
11. Describe plasma enchanted CVD method of preparation of nanomaterials.
Or
Explain classification vectors Cn, T, R in carbon nanotubes :
Cn - Chiral vector
T - Translational vector
R - Symmetry vector