Download OU B-Tech First Year 2012 January 5004 Engineering Physics Question Paper

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Time: 3 Hours]
[Max. Marks: 75
Note : Answerall questions from Part A, answerany five questions
from Part B.
PART-A (25 Marks)

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1. How many orders will be observed by a grating having 4000 lines per cm if it is
illuminated by visible light in the range 4000 A and 7000 A . 3
2. Match the following :
I II
1) The inner most part of optical fibre (a) Refractive index of core increases

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2) In Graded index fibre
towards the axis of the core
3) Laser beam is made of
(b) Interference
4) Hologram is related to

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(C) Core
(d) Highly coherent photons
(e) Electrons
(f) Non-uniform refractive index
A) 1 - b, a, 3 d, 4 b B) 1 c, 2 a, 3 - d, 4 - b

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C) 1 - d, 2 c, 3 a, 4 - f D)1-b,2--c,3-d,4--e 2
3.
The energy of an electron contained to move in a one-dimensional box of length
4 .0A is 9.664 x 10
-17

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J. Find out the order of excited state. 2
4. What is displacement current ? Explain.
2
5. 1) The Miller indices of a set of parallel planes which make equal intercepts on the
three axes are

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1
a) (121) b) (111) c) (100) d) (101)
ii) In a simple cubic lattice the ratio of d
100
: d

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110
: d
11
1
is

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2
a)
N
i6 : : At" b) : : ) 6 : : Nri
d) 6 : 3 : 1

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(This paper contains 2 pages)
P.T.O.
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1111 11 1 11 1111 1 11 1 1 1 11 1 1 1 11111 111E Code No. 5004/N
FACULTY OF ENGINEERING AND INFORMATICS

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B.E. I Year (New) Common to all Brinches (Suppl.)
Examination, January 2012
ENGINEERING PHYSICS
Time: 3 Hours]
[Max. Marks: 75

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Note : Answerall questions from Part A, answerany five questions
from Part B.
PART-A (25 Marks)
1. How many orders will be observed by a grating having 4000 lines per cm if it is
illuminated by visible light in the range 4000 A and 7000 A . 3

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2. Match the following :
I II
1) The inner most part of optical fibre (a) Refractive index of core increases
2) In Graded index fibre
towards the axis of the core

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3) Laser beam is made of
(b) Interference
4) Hologram is related to
(C) Core
(d) Highly coherent photons

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(e) Electrons
(f) Non-uniform refractive index
A) 1 - b, a, 3 d, 4 b B) 1 c, 2 a, 3 - d, 4 - b
C) 1 - d, 2 c, 3 a, 4 - f D)1-b,2--c,3-d,4--e 2
3.

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The energy of an electron contained to move in a one-dimensional box of length
4 .0A is 9.664 x 10
-17
J. Find out the order of excited state. 2
4. What is displacement current ? Explain.

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2
5. 1) The Miller indices of a set of parallel planes which make equal intercepts on the
three axes are
1
a) (121) b) (111) c) (100) d) (101)

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ii) In a simple cubic lattice the ratio of d
100
: d
110
: d

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11
1
is
2
a)

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N
i6 : : At" b) : : ) 6 : : Nri
d) 6 : 3 : 1
(This paper contains 2 pages)
P.T.O.

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111111111111111111111111131111111
Code No. 5004/N
6. Mobilities of electrons and holes in a sample of intrinsic Ge at 300 K are
0.36 m
2

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V
- 1
'S
-1
and 6.17 m

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2
V
-
S
-

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respecfiVetSt. if the resistivit of the specimen
is 2.12 L
-
2 m, compute the intrinsic concentration of carriers for Ge.
Where m

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e
0.5 m
o
and m
h

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0.37 m
o 3
7. Draw the crystal structure of Barium titanate above 393 K and explain how its
structure and polarization changes with decreasing temperature.
3

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8. Define the terms critical temperature, critical magnetic field and critical current. 3
9. What are carbon nano tubes ? Explain. 2
10. Explain the basic principle used in atomic force microscopes.
2
PART B (5x10=50 Marks)

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11. What is optical activity ? Explain construction and working of Larentz's half shade
polarimeter.
10
12. a) Explain what is phase-space.
(2+2+6)

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b) Distinguish between Basons and fermions. Obtain the expression for Fermi-
,
Dirac distribution law.
13. a) Show that among SC, B.C.C. and FCC, FCC has closed paCked structure. 5
b) Obtain an expression for the concentration of Schottkey defects in an ionic crystals. 5

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14. a) What are dielectrics ? Explain Various electrical polarization mechanism. 6
b) Distinguish between soft and hard magnetic materials. 4
15. a) Distinguish between bulk, thin film and nano-scale materials. 3
b) Explain the thermal evaporation method of depositing thin films. 7
16. a) Describe the classification of optical fibres.

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b) Write down the Maxwells equations and deduce an expression for the velocity
of propagation of a plane electro magnetic wave in homogeneous, isotropic
dielectric medium. 6
17. Write a note on :
a) LED. 5

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b) High temperature super conductors. 5
2 2,400
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