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Posted By: India Member Level: Diamond Posted Date: 19 Jan 2008
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2007 Jawaharlal Nehru Technological University B.Tech I Year Engineering Physics (RR-Set 4 - Aug / Sep'2007- Sup) Question paper
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Code No: RR10103 Set No. 4
I B.Tech Supplimentary Examinations, Aug/Sep 2007
ENGINEERING PHYSICS
( Common to Civil Engineering, Mechanical Engineering, Chemical
Engineering, Mechatronics, Metallurgy & Material Technology, Production
Engineering, Aeronautical Engineering and Automobile Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Explain the superposition of two harmonic disturbances and show that the
resultant intensity is dependent on the phase different between them.
(b) Give an account of colours of thin films.
(c) A water film in air is 3200 A.U. thick. If the refractive index of the film is
1.33, find the colors appear in the reflected spectrum when exposed to white
light at normal incidence. [6+6+4]
2. (a) What is meant by diffraction of light? Explain it on the basis of Huygen’s
wave theory.
(b) What are the types of diffraction and give the difference between them.
(c) What is the difference between Interference and Diffraction? [6+6+4]
3. (a) Explain the following:
i. Polarization by selective absorption
ii. Polarization by scattering.
(b) Prove that if the angle of incidence corresponds to the Brewster’s angle, then
the angle between reflected and refracted beams is 90o. [10+6]
4. (a) Explain the characteristics of a laser beam.
(b) What is population inversion?
(c) With a neat sketch explain the construction and working of a ruby laser.
[6+4+6]
5. (a) Give an example of engineering application in which you would use a material
with a low value of specific heat and a high value of specific heat.
(b) Discuss the variation of thermal conductivity of a solid with temperature.
(c) Explain the terms:
i. drift velocity
ii. relaxation time
iii. collision time and
iv. mean free path. [4+4+8]
6. (a) How are the dielectric materials classified?
(b) Write short notes on “Porcelain”. [10+6]
7. (a) Draw and explain B-H curve for a ferromagnetic material placed in a magnetic
field.
(b) Discuss the theory of paramagnetism.
(c) State the properties of diamagnetic materials. [6+6+4]
8. (a) Compare the relative merits of the various aircraft materials with suitable
example.
(b) Explain in brief the general system requirements for a spacecraft. [8+8]
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