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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 2 - Aug / Sep'2007- Sup) Question paper
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Code No: RR10103 Set No. 2
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) Give the theory of interference and obtain the condition for constructive and
destructive interference.
(b) Light waves of wavelength 650 nm and 500 nm produce interference fringes on
a screen at a distance of 1 m from a double slit of separation 0.5 mm. Find
the least distance of a point from the central maximum where bright fringe
due to both coincide. [12+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) What is meant by polarization of light?
(b) Describe an experiment that shows light is not propagated as longitudinal
waves.
(c) What is plane of vibration? [6+6+4]
4. (a) With necessary theory and energy level diagram, explain the working of a
Helium-Neon gas laser.
(b) Mention some important applications of lasers. [10+6]
5. (a) Write notes on
i. Thermo-gravimetric analysis and
ii. Thermo-mechanical analysis.
(b) The junctions of a thermo-couple are maintained at the ice point and steam
point. Calculate
i. thermo-e.m.f.,
ii. thermo-electric power,
iii. neutral temperature and
iv. inversion temperature,
if the variation of the thermo-e.m.f. (E) with temperature difference between
the junctions (t), is given by E = (35.6 × 10-6)t - (0.145 × 10-6)t2
. [10+6]
6. (a) How are the dielectric materials classified?
(b) Write short notes on “Glass”. [10+6]
7. (a) What is ferromagnetism? What are the distinguishing features of ferromagnetism?
(b) What are ferrites? Explain the magnetic properties of ferrites and mention
their industrial applications. [8+8]
8. (a) What is meant by hardness?
(b) Explain the significance of hardness in materials.
(c) What is meant by creep?
(d) Explain the various factors which affect the creep. [2+6+2+6]
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