Posted Date: 17 Jun 2016      Posted By:: Krishna Teja Yeluripati    Member Level: Gold  Points: 3 (Rs. 3)

# 2013 Acharya Nagarjuna University Bapatla Engineering College - Semester 2 - I/IV B.Tech - Engineering Physics II - Question Paper - July 2013 Question paper

 Course: University/board: Acharya Nagarjuna University

By any chance, do you need the old question papers of Bapatla Engineering College - B.Tech - Engineering Physics II? If you do, you are lucky. Because, this is the question paper conducted to first year second semester students of bapatla engineering college in July 2013. Feel free to store a copy of this paper and use in for your upcoming exams.

I/IV B.Tech Degree Examinations, July 2013

First Year

Second Semester

Engineering Physics II

Time : 3 hours

Maximum Marks : 60

Answer ONE question from each Unit

1. Answer the following [12 x 1 = 12M]
a) What is an effective mass?
b) Write the one dimensional periodic function as seen by a moving electron.
c) Draw the V-I characteristic curve for p-n junction diode.
d) What is Curie – Weiss law in ferromagnetic materials?
e) Define coercivity in magnetic materials.
f) Define dielectric constant.
g) What is the working principle of a photo diode?
h) What are ultrasonics?
i) Write some chemical properties of nano materials?
j) Give the effective charge and spin values of cooper electron pair.
k) Explain the principle involved in pulse echo technique.
l) State Bragg's law.

UNIT - I [1 x 12 = 12M]

2. a) Explain the salient features of Kronig Penny model and concept of hole.
2. b) Derive the continuity equation for electronics. (OR)
3. a) Write the main draw backs of classical free electron theory.
3. b) Obtain an expression for the carrier concentration in n-type semiconductors.
3. c) Discuss the variation of Fermi-Dirac distribution function with temperature.

UNIT - II [1 x 12 = 12M]

4. a) Explain the origin of magnetic dipole moment of an atom and define Bohr magneton.
4. b) Explain the domain theory of ferromagnetism.
4. c) Derive the Classius Mossetti equation. (OR)
5. a) Write the differences between hard and soft magnetic materials.
5. b) Discuss the frequency dependence of polarization in dielectrics.
5. c) What are ferroelectrics? Mention some applications.

UNIT - III [1 x 12 = 12M]

6. a) Explain how carbon nano tubes can be prepared by chemical vapour deposition method.
6. b) Give the BCS theory of superconductivity in brief.
6. c) Discuss the construction and working of a solar cell. (OR)
7. a) Write some important applications of nano materials.
7. b) Distinguish between soft and hard superconductors.
7. c) Write a note on LCD.

UNIT - IV [1 x 12 = 12M]

8. a) Explain some important applications of radioisotopes in medical field.
8. b) Describe the time of flight diffraction technique.
8. c) Explain the x-ray powder crystal analysis method. (OR)
9. a) Explain the working of a GM counter.
9. b) Write the uses of ultrasonics in cardiology and neurology studies.
9. c) Derive Bragg's law in x-ray diffraction.

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