Download VTU ((Visvesvaraya Technological University) B.E/B-Tech 2019 July ( Bachelor of Engineering) First & Second Semester (1st Semester & 2nd Semester) 2014 June-July 10PHY12 Engineering Physics Question Paper
10PHY12/22
eta%
First/Second Semester B.E. Degree Examination, June/July 2014
Engineering Physics
Time: 3 hrs. Max. Marks:100
Note: 1. Answer any FIVE full questions, choosing at least two from each part.
2. Answer all objective type questions only in OMR sheet page 5 of the answer booklet.
....
t-, 4. Physical constants : Velocity of light, c = 3 x 10
8
m/s
6
3. Answer to objective type questions on sheets other than OMR will not be valued.
8. Planck's constant, h = 6.625x 10
-34
.I.S.
Charge on electron, e =1.602 x 10
49
C
66
Mass of electron, m = 9.1 x 10
41
kg
-0
L i)
0
O Avagadro number, NA = 6.02 x 10
26
/k mole
Permittivity of vacuum, eo = 8.85 x 10
42
F/m
0
?
,
vzt '-' Boltzmann constant, k = 1.38 x 10
-23
.14.
ts4
_z:
.14
as
ci <5
PART ? A
ke)
? 0
0
1 a. Choose the correct answers for the following : (04 Marks)
0
c et,
i) If an electron, proton, neutron and a - particle have the same velocity, the particle
;. -d-
E ,i3
which has the largest wavelength is
1
2 0
=
= 4.) A) electron B) proton C) neutron D) a - particle
0
0 .r...
ii) The Compton shift for the back scattered photon is
, h
n
, 2 h ? 2h
.q
? ... A) ? p) ? C) D)
g.
mo
e m
o
e 2m
0
e
3m
D
e
t., .
- ,.. iii) The photoelectric effect is observed only if the wavelength of light is
0-2
-0 A) above threshold wavelength B) below threshold wavelength
:-'
'2 mi
C) zero D) equal to threshold wavelength
1-4
iv) The law which failed to account for longer wavelength of blackbody radiation
>, >
spectrum is
0
A) Wein's law B) Rayleigh-Jean's law
E 2
zn 7,
=
0
C) Plank's law D) Maxwell's law
0. ...
K l .
b. Describe photoelectric effect along with Einstein's explanation. (06 Marks)
o cd
,...-
.?
c. Describe Davisson and Germer experiment for confirmation of de-Broglie hypothesis.
`1 II
(07 Marks)
, .
V.:
_
d. Calculate the kinetic energy of an electron of wavelength 18 nm {h = 6.63 X 10
-34
,
tol
FC; r-?
,..
m
e
= 9.11 x 10
31
kg]. (03 Marks)
8 7.9.
>, ,.-
0
L-
9
to
t
.
" ;_!
2 a. Choose the correct answers for the following : (04 Marks)
c. g
i) From the Heisenberg's uncertainty relation, AL.A0 ?
h
, L refers to
c
4rt
o <
A) length B) linear displacement
? ?si
C) angular displacement D) angular momentum
ti
z
0
ii) The first excited state energy of a particle of mass m in a box of width 'a' is given by
'a'
h
2
2h
2
11
2
a
A
)
zero B) C) D)
8ma
2
8ma
2
2ma
2
0
iii) Wave function associated with a material particle is
A) single valued B) finite C) continuous D) all of these
iv) If the uncertainty in momentum is large, the uncertainty in energy is
A) small B) large C) zero D) independent
USN
1 A
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10PHY12/22
eta%
First/Second Semester B.E. Degree Examination, June/July 2014
Engineering Physics
Time: 3 hrs. Max. Marks:100
Note: 1. Answer any FIVE full questions, choosing at least two from each part.
2. Answer all objective type questions only in OMR sheet page 5 of the answer booklet.
....
t-, 4. Physical constants : Velocity of light, c = 3 x 10
8
m/s
6
3. Answer to objective type questions on sheets other than OMR will not be valued.
8. Planck's constant, h = 6.625x 10
-34
.I.S.
Charge on electron, e =1.602 x 10
49
C
66
Mass of electron, m = 9.1 x 10
41
kg
-0
L i)
0
O Avagadro number, NA = 6.02 x 10
26
/k mole
Permittivity of vacuum, eo = 8.85 x 10
42
F/m
0
?
,
vzt '-' Boltzmann constant, k = 1.38 x 10
-23
.14.
ts4
_z:
.14
as
ci <5
PART ? A
ke)
? 0
0
1 a. Choose the correct answers for the following : (04 Marks)
0
c et,
i) If an electron, proton, neutron and a - particle have the same velocity, the particle
;. -d-
E ,i3
which has the largest wavelength is
1
2 0
=
= 4.) A) electron B) proton C) neutron D) a - particle
0
0 .r...
ii) The Compton shift for the back scattered photon is
, h
n
, 2 h ? 2h
.q
? ... A) ? p) ? C) D)
g.
mo
e m
o
e 2m
0
e
3m
D
e
t., .
- ,.. iii) The photoelectric effect is observed only if the wavelength of light is
0-2
-0 A) above threshold wavelength B) below threshold wavelength
:-'
'2 mi
C) zero D) equal to threshold wavelength
1-4
iv) The law which failed to account for longer wavelength of blackbody radiation
>, >
spectrum is
0
A) Wein's law B) Rayleigh-Jean's law
E 2
zn 7,
=
0
C) Plank's law D) Maxwell's law
0. ...
K l .
b. Describe photoelectric effect along with Einstein's explanation. (06 Marks)
o cd
,...-
.?
c. Describe Davisson and Germer experiment for confirmation of de-Broglie hypothesis.
`1 II
(07 Marks)
, .
V.:
_
d. Calculate the kinetic energy of an electron of wavelength 18 nm {h = 6.63 X 10
-34
,
tol
FC; r-?
,..
m
e
= 9.11 x 10
31
kg]. (03 Marks)
8 7.9.
>, ,.-
0
L-
9
to
t
.
" ;_!
2 a. Choose the correct answers for the following : (04 Marks)
c. g
i) From the Heisenberg's uncertainty relation, AL.A0 ?
h
, L refers to
c
4rt
o <
A) length B) linear displacement
? ?si
C) angular displacement D) angular momentum
ti
z
0
ii) The first excited state energy of a particle of mass m in a box of width 'a' is given by
'a'
h
2
2h
2
11
2
a
A
)
zero B) C) D)
8ma
2
8ma
2
2ma
2
0
iii) Wave function associated with a material particle is
A) single valued B) finite C) continuous D) all of these
iv) If the uncertainty in momentum is large, the uncertainty in energy is
A) small B) large C) zero D) independent
USN
1 A
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10PHY12/22 '
b. Obtain the time indeperu
orrpal
ye equation for a particle in one-dimensional
potential well of infinite height and discuss the eigen values. (09 Marks)
What is Heisenberg's uncertainty principle? Discuss its significance. (03 Marks)
An excited atom has an average life time of 10
-8
seconds. During this period, it emits a
photon and returns to the ground state. What is the minimum uncertainty in the frequency of
this photon? (04 Marks)
3 a. Choose the correct answers for the following : (04 Marks)
i) The Fermi temperature is given by
Pi)
A\
2 E
F
, ,,
ED
?\)
3 E
F
E
F
2E
- D)
3 K 2 K
ii) If the mobility of an electron in a metal increases, the resistivity
A) decreases B) increases C) remains constant D) none of these
iii) The Fermi energy of a metal at absolute zero temperature is proportional to
(n - number of free electrons per unit volume).
A) n
i 3
B) n
32
C) n
3/3
D) n
2
iv) The electron energies in classical free electron theory follow
A) Maxwell-Boltzmann statistics B) Fermi-Dirac statistics
?
C) Bose-Einstein statistics D) none of these
b. Explain the failures of classical free electron theory.
r
(06 Marks)
c. Explain Fermi-energy and Fermi-factor. Discuss the probability of occupation of various
energy states by electron at T=0?K and T > 0?K on the basis of Fermi factor.
d.
4 a. Choose the correct answers for the following :
i) Copper is
A) diamagnetic material
C) ferromagnetic material
ii) Electronic polarization
11100 A) increases with temperature
C) independent of temperature
B) paramagnetic material
D) antiferromagnetic material
B) decreases with temperature
D) none of these
(04 Marks)
iii) The unit of dipole moment per unit volume is
A) coulomb/metre B) coulomb/metre
2
C) coulomb/metre
3
D) coulomb
iv) The electric susceptibility x =
A) E
0
EP B) C)
E
?
E
D)
E
l)
P
E E
0
Describe the different polarization mechanism. (08 Marks)
Explain hysteresis of ferroelectrics. (05 Marks)
If a NaCit crystal is subjected to an electric field of 1 KV/m and the resulting polarization is
4.3 x 10"
8
c/rn
2
. Calculate the dielectric constant of NaC9.. [E0 = 8.85 x 10
42
Fin
1
].(03 Marks)
PART ? B
5 a. Choose the correct answers for the following : (04 Marks)
i) The life time of an atom on a metastable state is of the order
A) a few seconds B) unlimited C) a nano second D) few millisecond
c.
d.
(06 Marks)
Calculate the mobility and relaxation time of electron in copper assuming that each atom
contributes one free electron for conduction. Given resistivity of copper = 1.73 x 10
-8
ohm-m.
At. weight = 63.5, density = 8.92 x 10
3
kg/m
3
, NA = 6.02 x 10
26
/kg mole. (04 Marks)
b.
c.
d.
f 4
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10PHY12/22
eta%
First/Second Semester B.E. Degree Examination, June/July 2014
Engineering Physics
Time: 3 hrs. Max. Marks:100
Note: 1. Answer any FIVE full questions, choosing at least two from each part.
2. Answer all objective type questions only in OMR sheet page 5 of the answer booklet.
....
t-, 4. Physical constants : Velocity of light, c = 3 x 10
8
m/s
6
3. Answer to objective type questions on sheets other than OMR will not be valued.
8. Planck's constant, h = 6.625x 10
-34
.I.S.
Charge on electron, e =1.602 x 10
49
C
66
Mass of electron, m = 9.1 x 10
41
kg
-0
L i)
0
O Avagadro number, NA = 6.02 x 10
26
/k mole
Permittivity of vacuum, eo = 8.85 x 10
42
F/m
0
?
,
vzt '-' Boltzmann constant, k = 1.38 x 10
-23
.14.
ts4
_z:
.14
as
ci <5
PART ? A
ke)
? 0
0
1 a. Choose the correct answers for the following : (04 Marks)
0
c et,
i) If an electron, proton, neutron and a - particle have the same velocity, the particle
;. -d-
E ,i3
which has the largest wavelength is
1
2 0
=
= 4.) A) electron B) proton C) neutron D) a - particle
0
0 .r...
ii) The Compton shift for the back scattered photon is
, h
n
, 2 h ? 2h
.q
? ... A) ? p) ? C) D)
g.
mo
e m
o
e 2m
0
e
3m
D
e
t., .
- ,.. iii) The photoelectric effect is observed only if the wavelength of light is
0-2
-0 A) above threshold wavelength B) below threshold wavelength
:-'
'2 mi
C) zero D) equal to threshold wavelength
1-4
iv) The law which failed to account for longer wavelength of blackbody radiation
>, >
spectrum is
0
A) Wein's law B) Rayleigh-Jean's law
E 2
zn 7,
=
0
C) Plank's law D) Maxwell's law
0. ...
K l .
b. Describe photoelectric effect along with Einstein's explanation. (06 Marks)
o cd
,...-
.?
c. Describe Davisson and Germer experiment for confirmation of de-Broglie hypothesis.
`1 II
(07 Marks)
, .
V.:
_
d. Calculate the kinetic energy of an electron of wavelength 18 nm {h = 6.63 X 10
-34
,
tol
FC; r-?
,..
m
e
= 9.11 x 10
31
kg]. (03 Marks)
8 7.9.
>, ,.-
0
L-
9
to
t
.
" ;_!
2 a. Choose the correct answers for the following : (04 Marks)
c. g
i) From the Heisenberg's uncertainty relation, AL.A0 ?
h
, L refers to
c
4rt
o <
A) length B) linear displacement
? ?si
C) angular displacement D) angular momentum
ti
z
0
ii) The first excited state energy of a particle of mass m in a box of width 'a' is given by
'a'
h
2
2h
2
11
2
a
A
)
zero B) C) D)
8ma
2
8ma
2
2ma
2
0
iii) Wave function associated with a material particle is
A) single valued B) finite C) continuous D) all of these
iv) If the uncertainty in momentum is large, the uncertainty in energy is
A) small B) large C) zero D) independent
USN
1 A
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10PHY12/22 '
b. Obtain the time indeperu
orrpal
ye equation for a particle in one-dimensional
potential well of infinite height and discuss the eigen values. (09 Marks)
What is Heisenberg's uncertainty principle? Discuss its significance. (03 Marks)
An excited atom has an average life time of 10
-8
seconds. During this period, it emits a
photon and returns to the ground state. What is the minimum uncertainty in the frequency of
this photon? (04 Marks)
3 a. Choose the correct answers for the following : (04 Marks)
i) The Fermi temperature is given by
Pi)
A\
2 E
F
, ,,
ED
?\)
3 E
F
E
F
2E
- D)
3 K 2 K
ii) If the mobility of an electron in a metal increases, the resistivity
A) decreases B) increases C) remains constant D) none of these
iii) The Fermi energy of a metal at absolute zero temperature is proportional to
(n - number of free electrons per unit volume).
A) n
i 3
B) n
32
C) n
3/3
D) n
2
iv) The electron energies in classical free electron theory follow
A) Maxwell-Boltzmann statistics B) Fermi-Dirac statistics
?
C) Bose-Einstein statistics D) none of these
b. Explain the failures of classical free electron theory.
r
(06 Marks)
c. Explain Fermi-energy and Fermi-factor. Discuss the probability of occupation of various
energy states by electron at T=0?K and T > 0?K on the basis of Fermi factor.
d.
4 a. Choose the correct answers for the following :
i) Copper is
A) diamagnetic material
C) ferromagnetic material
ii) Electronic polarization
11100 A) increases with temperature
C) independent of temperature
B) paramagnetic material
D) antiferromagnetic material
B) decreases with temperature
D) none of these
(04 Marks)
iii) The unit of dipole moment per unit volume is
A) coulomb/metre B) coulomb/metre
2
C) coulomb/metre
3
D) coulomb
iv) The electric susceptibility x =
A) E
0
EP B) C)
E
?
E
D)
E
l)
P
E E
0
Describe the different polarization mechanism. (08 Marks)
Explain hysteresis of ferroelectrics. (05 Marks)
If a NaCit crystal is subjected to an electric field of 1 KV/m and the resulting polarization is
4.3 x 10"
8
c/rn
2
. Calculate the dielectric constant of NaC9.. [E0 = 8.85 x 10
42
Fin
1
].(03 Marks)
PART ? B
5 a. Choose the correct answers for the following : (04 Marks)
i) The life time of an atom on a metastable state is of the order
A) a few seconds B) unlimited C) a nano second D) few millisecond
c.
d.
(06 Marks)
Calculate the mobility and relaxation time of electron in copper assuming that each atom
contributes one free electron for conduction. Given resistivity of copper = 1.73 x 10
-8
ohm-m.
At. weight = 63.5, density = 8.92 x 10
3
kg/m
3
, NA = 6.02 x 10
26
/kg mole. (04 Marks)
b.
c.
d.
f 4
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10PHY12/22
The ratio of Einstein _ __. _............_....-. _ .._.. B is
&EU.' 87th 87thy
3
A) B) C)
C
3
C
3
C
3
Holography records
A) only amplitude
C) both amplitude and phase
Pumping process in a diode laser is by
A) optical pumping B) forward bias
87chy
3
C
2
B) only phase
D) neither amplitude nor phase
C) electric discharge D) none of these
b. Explain the construction and working of a He-Ne lase
c. Explain the principle of holography and mention its a
d. Find the ratio of populations of two energy levels in
produces light of wavelength 6493 A , assuming
[K = 1.38 x 10
-23
PK].
the ambient temperature as 27?C.
(04 Marks)
r. (07 Marks)
pplications. (05 Marks)
a laser if the transition between them
6 a. Choose the correct answers for the following : (04 Marks)
i) If the angle of incidence of a ray is equal to the critical angle at the interface of core an
cladding, then the ray travels ?
A) in the cladding B) in the core
C) along the interface D) in the buffer
ii) Fractional index change for the optical fibre of refractive index core and cladding
1.68 and 1.56 is
-1
1
,
A) 0.0769 B) 0.0714 C) 1.0769 D) 0.9286
iii) A type II superconductor in the vortex state show
A) complete Meissner effect and zero electrical resistivity
B) incomplete Meissner effect and zero electrical resistivity
C) complete Meissner effect and non-zero electrical resistivity
D) incomplete Meissner effect and non-zero electrical resistivity
iv) Below the critical temperature, if the temperature of superconductor is increased, the
critical field
A) increases B) decreases C) remains constant D) independent
What is attenuation? Explain the various mechanisms through which attenuation takes place.
(07 Marks)
Explain type-I and type-II superconductors.
(05 Marks)
The numerical aperture of an optical fibre is 0.2 when surrounded by air. Determine the RI
of its core, given the RI of the cladding is 1.59. Also find the acceptance angle when the
fibre is in water of RI 1.33.
(04 Marks)
7 a. Choose the correct answers for the following :
(04 Marks)
i) A crystal of hexagonal lattice has unit cell with sides
A)a#b#c, a#(3#y# 90? B) a = b = c, a ?13 = = 90?
C) a b = c, a =13 = 120?, y=90? D) a = b c, cc =13 = 90?, y = 120?
ii) A plane intercepts at a, ?
b
, 2c in a simple cubic unit cell. The miller indices of the
2
plane are
A) (2 1 4) B) (2 4 I) C) (4 2 1) D) (1 2 4)
iii) The coordination number in face centered cubic cell is
A) 2 B) 6 C) 8 D) 12
3 of 4
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10PHY12/22
eta%
First/Second Semester B.E. Degree Examination, June/July 2014
Engineering Physics
Time: 3 hrs. Max. Marks:100
Note: 1. Answer any FIVE full questions, choosing at least two from each part.
2. Answer all objective type questions only in OMR sheet page 5 of the answer booklet.
....
t-, 4. Physical constants : Velocity of light, c = 3 x 10
8
m/s
6
3. Answer to objective type questions on sheets other than OMR will not be valued.
8. Planck's constant, h = 6.625x 10
-34
.I.S.
Charge on electron, e =1.602 x 10
49
C
66
Mass of electron, m = 9.1 x 10
41
kg
-0
L i)
0
O Avagadro number, NA = 6.02 x 10
26
/k mole
Permittivity of vacuum, eo = 8.85 x 10
42
F/m
0
?
,
vzt '-' Boltzmann constant, k = 1.38 x 10
-23
.14.
ts4
_z:
.14
as
ci <5
PART ? A
ke)
? 0
0
1 a. Choose the correct answers for the following : (04 Marks)
0
c et,
i) If an electron, proton, neutron and a - particle have the same velocity, the particle
;. -d-
E ,i3
which has the largest wavelength is
1
2 0
=
= 4.) A) electron B) proton C) neutron D) a - particle
0
0 .r...
ii) The Compton shift for the back scattered photon is
, h
n
, 2 h ? 2h
.q
? ... A) ? p) ? C) D)
g.
mo
e m
o
e 2m
0
e
3m
D
e
t., .
- ,.. iii) The photoelectric effect is observed only if the wavelength of light is
0-2
-0 A) above threshold wavelength B) below threshold wavelength
:-'
'2 mi
C) zero D) equal to threshold wavelength
1-4
iv) The law which failed to account for longer wavelength of blackbody radiation
>, >
spectrum is
0
A) Wein's law B) Rayleigh-Jean's law
E 2
zn 7,
=
0
C) Plank's law D) Maxwell's law
0. ...
K l .
b. Describe photoelectric effect along with Einstein's explanation. (06 Marks)
o cd
,...-
.?
c. Describe Davisson and Germer experiment for confirmation of de-Broglie hypothesis.
`1 II
(07 Marks)
, .
V.:
_
d. Calculate the kinetic energy of an electron of wavelength 18 nm {h = 6.63 X 10
-34
,
tol
FC; r-?
,..
m
e
= 9.11 x 10
31
kg]. (03 Marks)
8 7.9.
>, ,.-
0
L-
9
to
t
.
" ;_!
2 a. Choose the correct answers for the following : (04 Marks)
c. g
i) From the Heisenberg's uncertainty relation, AL.A0 ?
h
, L refers to
c
4rt
o <
A) length B) linear displacement
? ?si
C) angular displacement D) angular momentum
ti
z
0
ii) The first excited state energy of a particle of mass m in a box of width 'a' is given by
'a'
h
2
2h
2
11
2
a
A
)
zero B) C) D)
8ma
2
8ma
2
2ma
2
0
iii) Wave function associated with a material particle is
A) single valued B) finite C) continuous D) all of these
iv) If the uncertainty in momentum is large, the uncertainty in energy is
A) small B) large C) zero D) independent
USN
1 A
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10PHY12/22 '
b. Obtain the time indeperu
orrpal
ye equation for a particle in one-dimensional
potential well of infinite height and discuss the eigen values. (09 Marks)
What is Heisenberg's uncertainty principle? Discuss its significance. (03 Marks)
An excited atom has an average life time of 10
-8
seconds. During this period, it emits a
photon and returns to the ground state. What is the minimum uncertainty in the frequency of
this photon? (04 Marks)
3 a. Choose the correct answers for the following : (04 Marks)
i) The Fermi temperature is given by
Pi)
A\
2 E
F
, ,,
ED
?\)
3 E
F
E
F
2E
- D)
3 K 2 K
ii) If the mobility of an electron in a metal increases, the resistivity
A) decreases B) increases C) remains constant D) none of these
iii) The Fermi energy of a metal at absolute zero temperature is proportional to
(n - number of free electrons per unit volume).
A) n
i 3
B) n
32
C) n
3/3
D) n
2
iv) The electron energies in classical free electron theory follow
A) Maxwell-Boltzmann statistics B) Fermi-Dirac statistics
?
C) Bose-Einstein statistics D) none of these
b. Explain the failures of classical free electron theory.
r
(06 Marks)
c. Explain Fermi-energy and Fermi-factor. Discuss the probability of occupation of various
energy states by electron at T=0?K and T > 0?K on the basis of Fermi factor.
d.
4 a. Choose the correct answers for the following :
i) Copper is
A) diamagnetic material
C) ferromagnetic material
ii) Electronic polarization
11100 A) increases with temperature
C) independent of temperature
B) paramagnetic material
D) antiferromagnetic material
B) decreases with temperature
D) none of these
(04 Marks)
iii) The unit of dipole moment per unit volume is
A) coulomb/metre B) coulomb/metre
2
C) coulomb/metre
3
D) coulomb
iv) The electric susceptibility x =
A) E
0
EP B) C)
E
?
E
D)
E
l)
P
E E
0
Describe the different polarization mechanism. (08 Marks)
Explain hysteresis of ferroelectrics. (05 Marks)
If a NaCit crystal is subjected to an electric field of 1 KV/m and the resulting polarization is
4.3 x 10"
8
c/rn
2
. Calculate the dielectric constant of NaC9.. [E0 = 8.85 x 10
42
Fin
1
].(03 Marks)
PART ? B
5 a. Choose the correct answers for the following : (04 Marks)
i) The life time of an atom on a metastable state is of the order
A) a few seconds B) unlimited C) a nano second D) few millisecond
c.
d.
(06 Marks)
Calculate the mobility and relaxation time of electron in copper assuming that each atom
contributes one free electron for conduction. Given resistivity of copper = 1.73 x 10
-8
ohm-m.
At. weight = 63.5, density = 8.92 x 10
3
kg/m
3
, NA = 6.02 x 10
26
/kg mole. (04 Marks)
b.
c.
d.
f 4
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10PHY12/22
The ratio of Einstein _ __. _............_....-. _ .._.. B is
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A) B) C)
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3
C
3
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Holography records
A) only amplitude
C) both amplitude and phase
Pumping process in a diode laser is by
A) optical pumping B) forward bias
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C
2
B) only phase
D) neither amplitude nor phase
C) electric discharge D) none of these
b. Explain the construction and working of a He-Ne lase
c. Explain the principle of holography and mention its a
d. Find the ratio of populations of two energy levels in
produces light of wavelength 6493 A , assuming
[K = 1.38 x 10
-23
PK].
the ambient temperature as 27?C.
(04 Marks)
r. (07 Marks)
pplications. (05 Marks)
a laser if the transition between them
6 a. Choose the correct answers for the following : (04 Marks)
i) If the angle of incidence of a ray is equal to the critical angle at the interface of core an
cladding, then the ray travels ?
A) in the cladding B) in the core
C) along the interface D) in the buffer
ii) Fractional index change for the optical fibre of refractive index core and cladding
1.68 and 1.56 is
-1
1
,
A) 0.0769 B) 0.0714 C) 1.0769 D) 0.9286
iii) A type II superconductor in the vortex state show
A) complete Meissner effect and zero electrical resistivity
B) incomplete Meissner effect and zero electrical resistivity
C) complete Meissner effect and non-zero electrical resistivity
D) incomplete Meissner effect and non-zero electrical resistivity
iv) Below the critical temperature, if the temperature of superconductor is increased, the
critical field
A) increases B) decreases C) remains constant D) independent
What is attenuation? Explain the various mechanisms through which attenuation takes place.
(07 Marks)
Explain type-I and type-II superconductors.
(05 Marks)
The numerical aperture of an optical fibre is 0.2 when surrounded by air. Determine the RI
of its core, given the RI of the cladding is 1.59. Also find the acceptance angle when the
fibre is in water of RI 1.33.
(04 Marks)
7 a. Choose the correct answers for the following :
(04 Marks)
i) A crystal of hexagonal lattice has unit cell with sides
A)a#b#c, a#(3#y# 90? B) a = b = c, a ?13 = = 90?
C) a b = c, a =13 = 120?, y=90? D) a = b c, cc =13 = 90?, y = 120?
ii) A plane intercepts at a, ?
b
, 2c in a simple cubic unit cell. The miller indices of the
2
plane are
A) (2 1 4) B) (2 4 I) C) (4 2 1) D) (1 2 4)
iii) The coordination number in face centered cubic cell is
A) 2 B) 6 C) 8 D) 12
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10PHY12.122
C1644
70 f Et?9/
iv) In the Bragg's equal
O
- he angle 0 is
A) the angle between the incident beam and the diffracted X-ray beam.
B) the angle between the incident beam and the normal to the diffraction planes
C) the angle between the incident beam and the diffraction planes
D) none of these.
b. Define packing factor. Calculate the packing factor for sc, bcc and fcc structures. (07 Marks)
c. Describe the construction and working of a Bragg's X-ray spectrometer. (06 Marks)
d. Draw the following planes in a cubic unit cell:
i) (2 0 0) ii) ( 2 1 0) iii) (1 3 2) (03 Marks)
8 a. Choose the correct answers for the following : (04 Marks)
i) Carbon nanotubes are made up of
A) graphene B) mica sheet layers
C) honey comb D) plastic
ii) The state of matter around the nano-size is known as
A) solid state B) liquid state
C) plasma state D) mesoscopic state
iii) The elastic behaviour of a liquid is characterized by its
A) Young's modulus B) Rigidity modulus
C) Bulk modulus D) Poisson's ratio
iv) Ultrasonic waves are produced by
A) electromagnetic induction B) electric tuning fork
C) piezo electric effect D) inverse piezo electric effect
b. Write a note on fullerence. What are the applications of fullerences. (08 Marks)
c. Explain with principle, how the flaw in a solid can be detected by non-destructive method
using ultrasonics. (08 Marks)
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This post was last modified on 01 January 2020