DR. BABASAHEB
AMBEDKAR
TECHNOLOGICAL
Chemical,
UNIVERSITY,
LON ERE
First Year B. Tech. (Mechanical,
Civil and Petrochemical)
End Semester Examination
Subject: Engineering Physics
-201'1.
Maximum
Marks:
60
:
- hour
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9APA 2017
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Instructions
to the sludcnts:
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.
All qut:stions are ~ompulsory and each question carries 10 marks
Necessary data is given in the respective questions. Ifsuch data is not given, it mean~ that the kno\'.'ledge of
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3
.
.
tile pan is part of examination
.
..J.
If some part or parameter is noticed to be missing, you may appropriately
assume it and should mention it
clearly.
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Q.I Attempt the following.
a) Obtain the differcntial equation of damped oscillation and find its general solution.
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b) Calculatc the natural frequency of the ultrasonic waves generated by a quartz crystal having
thickness of 5.5 mm.
Given y= 80 GPa, p = 2650 kg/m3
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Q.2 Attempt the following
a) Explain theory of Newton's rings for reflected light.
b) Light of wavelength 5500 A falls normally on a thin wedge shaped film of R.L 1.4 forming
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fringes that are 2.5 mm apart. Find the angle of wedge.
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OR
Q.2 Attcmpt the following
a) Explain the principle and working of He-Ne gas laser
b) The numerical aperture of an optical fiber is 0.5 and Core refractive index is 1.54. Find the
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Q.3 Attempt the following.
a) Explain the principle and working of Bainbridgc mass spectrograph.
b) What is Uncertainty principle? Using this principle prove that electron cannot exist in the
nucleus.
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QA Attempt the following.
a) State and prove Mosley's law. What is its importance?
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h) Silver has FCC structure and its atomic radius is 1.414 A. Find the interplaner spacing for
200) planes.
(
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Q.5 Attempt the following .
.a) What is Hysteresis Curve? Explain retentivity, coercivity. Explain B-H curve on the basis of
domain theory.
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b) What is Meissner effect and effect of external magnetic field on superconducting state of
material?
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At 6 K, critical field is 5 x IojNm. Calculate transition temperature when critieal field is 2 x
1
0" Aim at 0 K.
QJ, Att('mpt any two of til(' following.
a) What is Hall effect? Derive an expression for Hall Coefficient and mobility of charge
carners.
h) What is electric polarization? Explain with diagrams different types of polarizations III
dielectric
c) Derive an expression for electromagnetic wave in free space. Find the value of velocity of
light in free space.
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