Download AKTU B-Tech 2nd Sem 2014-15 NAS 201 Engineering Physics II Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 2nd Semester (Second Semester) 2014-15 NAS 201 Engineering Physics II Question Paper

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(Following Paper 1]) and Roll No. to be filled in your Answer Book)
PAPER ID I 199220
Roll No.
B. Tech.
(SEM. II) THEORY EXAMINATION, 2014-15
ENGINEERDIG PHYSICS - 11
Time : 2 Hours] [Total Marks : 50
Note: Attempt All Section's Question as per the given instruction.
Section ?- A
Attempt all parts of this question. Each part canies 2 marks :
1 (a) . What are Miller indices? How are they calculated?
(b) What are polar and non polar molecules? ?
(c) What is hysteresis loss ?
(d) What is Fermi level?
(e) Explain the concept of displacement current.
Section - B
Attempt any three parts of this question. Each part cam?es
5 marks :
2 (a) A superconducting tin has a critical temperature of 3.7
K at zero magnetic ?eld and a critical magnetic ?eld
0.0306 tesla at 0 K. Find the critical magnetic ?eld at
2 K.
199220] 1 [ Contd...

(b) Calculate the change in nmgnetic moment ofa circma?ng
electron in an applied ?eld of 2 tesla acting perpendicular
to the plane of the orbit Given r = 5 29 X lO'llm
for the radius of the orbit. '
(c) Calculate the tnagnitude of Poynting vector at the
surface of the Sun. Given that power radiated by
sun = 3.8 X 1026 watts and radius of the
sun ? 7 x 108 m
(d) _ In a p-type semiconductor the Fermi level is 0.3 eV
abovethe valence band at temperature 300 K. Determine
the new position of Fermi level for temperature 400 K.
(e) Copper has a density of 8.96 gm/cm3 and an atomic
weight of 63.5. Calculate the distance between two
nearest copper atoms in BCC structure. (Avogadro's
number = 6.023 X 1023 per kg-mole)
Section - C
Attempt all question of this section. Each question carries 5
marks.
Attempt any one part of the following :
(a) What are Miller indices? How they are calculated?
(b) De?ne atomic packing factor. Calculate APF in case
of SC, BCC and FCC.
Attempt any one pan of the following :
(a) Discuss the frequency dependence of dielectric constant.
(b) What is the hysteresis curve? Explain residual magnetism
and coercive force?
199220] 2 [ Contd...
Attempt any one part of the following :
(a) Deduce the wave equation for EM waves in conducting
medium
_ 6D 2
(b) Using Maxwell equation Curl B = no [J +?] . Prove
at
that div D =p
Attempt any one part of the following :
(a) Detive' an expression for the conductivity of a
semiconductor containing both free electrons and holes
in temts of the concentration 11 and p and the mobility
pe and uh .
(b) What are type I and type II superconductors? Explain.
Attempt any one part of the following :
(a) What do you mean by Meissner effect? Explain how
Meissner e??ect proves the superconductor is a perfect
diamagnetic material. ,
(b) Show that a F ermi level in an intrinsic semiconductor
lies half way between the top of valence band and
bottom of conduction band.
199220] 3 ' [73500 1'