M.Sc. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2017.
Third Semester
Physics
Paper IV MATERIALS SCIENCE
2 20734 A
Time 3 Hours Max. Marks 70
SECTION — A
Answer any FIVE questions. 6 30 Marks)
All questions carry equal marks.
1. Explain the hysteresis behaviour of ferromagnetic material.
2. Explain the structure of ferrites.
3. Obtain Clausius-Mossotti relation.
4. Give the characteristics of solar cell.
5. Give the importance of Humme-Rothery's rules.
6. Explain briefly the order-disorder transformations.
7. Explain the elementary ideas of quantum wells.
8. What do you mean by electrostatic stabilization in nanomaterials? Explain.
SECTION — B
Answer ALL questions. 10 40 Marks)
All questions carry equal marks.
9. Discuss the origin of Weiss field on the basis of Heisenberg's theory.
Or
Discuss the two sub-lattice model of Antiferromagnetism.
10. Explain the principle, theory and working of LED.
Or
Define polarizabilty and explain the dependence of polarizability and
dielectric loss on frequency.

11. State and explain Gibb's phase rule and discuss the phase diagram of
complete solid solution.
Or
Explain the phase diagrams of Cu-Ni and Iron-Carbon systems.
12. Discuss in detail the quantum size effect in the properties of nanomaterials.
Or
Describe the Ball milling method in the fabrication of nanomaterials.
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