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Posted Date: 24 May 2009 Posted By: vivek Member Level: Gold
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2003 Jawaharlal Nehru Technological University Production I B.Tech. Supplementary Examinations, November-2003 ENGINEERING PHYSICS Question paper
Code No.NR-10153
I B.Tech. Supplementary Examinations, November-2003
ENGINEERING PHYSICS
(Common to Civil Engineering, Mechanical Engineering, Aeronautical Engineering, Chemical Engineering, Production Engineering, Mechatronics Metallurgy and Material Technology)
Time: 3 hours Max.Marks: 80
Answer any FIVE questions
All questions carry equal marks
---
1.a) Describe with examples the types of waves.
b) Derive an expression for the speed of sound waves in a gaseous medium.
c) If a violin string is tuned to a certain note, by how much must the tension in the string be increased if it is to emit a note of double the original frequency?
2.a) State the difference between the ‘o-ray’ and ‘e-ray’ in the phenomenon of ‘double refraction’ and hence explain how a beam of ‘circularly polarized light’ can be obtained.
b) Calculate the thickness of a calcite crystal to act as a quarter wave plate for light of wavelength 560 nm, if its refractive indices for the o-ray and the e-ray are 1.648 and 1.486 respectively.
3.a) Describe the construction and working of a Ruby laser.
b) What is meant by acceptance angle for an optical fiber? Show how it is related to numerical aperture.
4.a) Explain in detail the terms: (i) Space lattice (ii) Unit cell
(iii) Coordination number and (iv) Miller indices.
b) Show that the face centered cubic structure possesses maximum packing density among cubic structures.
c) Draw the (112) and (120) planes, and the [112] and [120] directions of a simple cubic crystal.
5.a) Describe and discuss the salient features of free-electron theory of metals. Obtain the expressions for Fermi energy and electronic specific heat.
b) Distinguish between a super-conductor and a normal metal, both maintained at same temperature.
6.a) Explain the terms (i) Magnetic induction (ii) Magnetic susceptibility
(iii) Permeability of a medium and (iv) Intensity of magnetization.
b) A magnetic material has a magnetization of 3300 amp/m, and flux density of 0.0044 weber/sq.m. Calculate the magnetizing force and the relative permeability of the material.
7.a) What is meant by polarization of a dielectric material? Mention the different mechanisms of polarization in a dielectric.
b) How ferroelectrics are different from ordinary dielectrics.
8. Write short notes on any THREE of the following:
(a) Fraunhoffer diffraction at a single slit
(b) Type-I and Type-II superconductors
(c) Holography and its applications
(d) Bravais two-dimensional lattices
(e) Hard and Soft magnetic materials.
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