STUPIDSID
1
Write down the expression for Fermi-Distribution function.
2 M
2
Give the expression for the carrier concentration in metals.
2 M
3
Give any two examples of pentavalent and Trivalent impurities.
2 M
4
Name any two compound semiconductor with applications.
2 M
5
What is hysteresis phenomenon?
2 M
6
What are High Temperature Superconductors?
2 M
7
Define: oriental polarization.
2 M
8
What are dielectric losses?
2 M
9
What are Shape Memory alloys?
2 M
10
What do you mean by Nanomaterials?
2 M
Answer any one question from Q11 (a) & Q11 (b)
11 (a)
Obtain an expression for electrical and thermal conductivities based on classical free electron theory and prove the Wiedmann-Franz law.
16 M
11 (b)
Obtain an expression for the Fermi energy. Also deduce the expression for the average of an electron at OK.
16 M
Answer any one question from Q12 (a) & Q12 (b)
12 (a)
Obtain an expression for carrier concentration of charges in an n-type semiconductor. Describe the variations of Fermi-level with Temp and impurity concentration.
16 M
12 (b) (i)
Define Hall effect. Derive the Hall co-efficient. Any four applications of Hall effect.
12 M
12 (b) (ii)
An n-type Germanium sample has a donar density of 1021/m3. It is arranged in a Hall experiment having B=0.5 W/m2 and J=500 A/m2. Find the Hall voltage if the sample is 3 mm thick.
4 M
Answer any one question from Q13 (a) & Q13 (b)
13 (a) (i)
Discuss the various energies involved in the formation of domains.
8 M
13 (a) (ii)
Write an essay on ferrites.
8 M
Write short notes on:
13 (b) (i)
Properties of superconductor.
8 M
13 (b) (ii)
Application of Superconductor.
8 M
Answer any one question from Q14 (a) & Q14 (b)
14 (a) (i)
Explain about:
Electronic Polarisation, Ionic Polarisation.
Electronic Polarisation, Ionic Polarisation.
8 M
14 (a) (ii)
Dielectric breakdown.
8 M
14 (b)
Derive an expression for the internal field in a dielectric and hence obtain the Clausis-Mosotti equation.
16 M
Answer any one question from Q15 (a) & Q15 (b)
15 (a) (i)
Write short notes on:
Metallic glasses.
Metallic glasses.
8 M
15 (a) (ii)
Shape Memory Alloys.
8 M
15 (b) (i)
Any two methods of preparing Nanomaterials.
8 M
15 (b) (ii)
Discuss the structure and applications of Carbon Nano Tubes.
8 M
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