Rajasthan Public Service Commission 2016
Paper PhysicsI
Ques: 150
Time: 3 Hours
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The energy stored in a capacitor can be given by



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between A and B
to the left of A

to the right of B
perpendicular to AB
A ... B .. ... ...
A .. ..... ..
B .. ..... ..
AB .. ......
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A wave is incident normally on a good conductor. If the frequency of a plane electromagnetic wave increases
four times, the skin depth, will
increase by a factor of 2
decrease by a factor of 4
remains the same
decrease by a factor of 2
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1/4 .. ......
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The intrinsic impedence of free space is



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Lorentz force Law




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Will increase
Will decrease
Will not change
Will first increase and then decrease
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.....
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400 V
100 V
600 V

0 V
400 V
100 V
600 V
0 V
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Poynting vector gives:1)
Rate of energy flow
direction of polarization
Intensity of electric field
Intensity of magnetic field
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Ques :10
Interference of light gives evidence that
The speed of light is very large
Light is a transverse wave
Light is electromagnetic in character
Light is a wave phenomenon
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Ques :11
How many slits would a diffraction grating need to be able to resolve two wavelengths: 500.0 nm and 500.1
nm in second order
5000
50,000
25,000
2500
........ ... ... 500.0 nm ... 500.1 nm . .. .......... .. ....... .... .. .... ...... .... ... ......
....... (slits) . ....... ....
5000
50,000
25,000
2500
Ques :12









Ques :13
Two lenses A and B have identical shapes, but the index of refraction of A is 1.5 and that of B is 1.6, what is
the ratio of focal length of B to that of A
1.2
0.833
1.067
0.938
.. .... A ... B .. .... ... . .. ... .... ........ .... 1.5 ... 1.6 .. .. . A . ..... ... B .
.... ..... .. ...... ... ....
1.2
0.833
1.067
0.938
Ques :14
Light has wave length 600 nm in Vacuum . It passes into glass, which has an index of refraction of 1.5 . What
is the frequency of the light inside the glass




.... ... ..... . ......... 600 nm .. 1.5 ........ .. .... .. .. ....... .... .. .... .. . .. ...
... . ... ....




Ques :15
When a light wave enters into a medium of different optical density

its speed and frequency changes
its speed and wavelength changes
its frequency and wavelength changes
its speed, frequency and wavelength changes
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Ques :16
Two light sources are said to be coherent if they
are of the same frequency
are of the same frequency and maintain a constant phase difference
are of the same amplitude, and maintain a constant phase difference
are of the same frequency and amplitude
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Ques :17
The speed of electron in the first orbit of Hydrogen atom is velocity of light
c
c/50
c/100
c/137
....... ...... . .... . . ... ...... . ... .... ... .. ... .... ..... .
c
c/50
c/100
c/137
Ques :18
AC (Alternating current) can be measured with the help of
Moving coil galvanometer
Hot wire ammeter
Tangent galvanometer
Hot wire volmeter
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Ques :19
With increase in frequency of an AC supply, the impedence of an LCR series circuit
Remains same
Increases
Decreases
Decreases at first, becomes minimum and then increases
... LCR ...... . .. ....., ....... .... ...... . ... . .. .....
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Ques :20
In an AC circuit the electrical energy is consumed in
L
C
R
L and C
....... .... ...... ... ........ ... .. ..... .... ... .. ....... .... ..
L
C
R
L and C
Ques :21
The impedence of LCR circuit in an AC circuit



....... .... ...... ... ... ... LCR ...... . .. ..... ....



Ques :22
In a series LCR circuit the resonant frequency is 1000 Hz . The half power points are obtained at frequencies
950 Hz and 1050 Hz. What are the quality factor and bandwidth of the circuit respectively
100, 100 Hz
10, 100 Hz
10, 10 Hz
100, 10 Hz

.. ... LCR ...... ... ...... ... . 1000 Hz .. ....
.. ... .. 950 Hz ... 1050 Hz ... .. ..
... .... .. ...... .. ..... .... ... .... ..... .... . ..
100, 100 Hz
10, 100 Hz
10, 10 Hz
100, 10 Hz
Ques :23
The two basic component of a Thevenin equivalent ac circuit are
The equivalent voltage source and the equivalent parallel resistance
The equivalent voltage source and the equivalent parallel impedence
The equivalent voltage source and the equivalent series resistance
The equivalent voltage source and the equivalent series impedence
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Ques :24
In applying the Superposition theorem:1)
All Sources are considered independently
The Sources are considered one at a time with all others replaced by their internal impedence
All Sources are considered simultaneously
The Sources are considered one at a time with all others replaced by their internal resistance
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Ques :25
Nortan theorem gives
an equivalent voltage source in parallel with an equivalent impedence
an equivalent current source in series with an equivalent impedence .
an equivalent current source in parallel with an equivalent impedence
an equivalent voltage source in series with an equivalent impedence
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Ques :26
The built in potential of a pn
junction diode is a function of

temperature
biased voltage
doping density
All of these
pn
..... ..... .. ... ..... ..... ...... ... ..
...
......
.....
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.... .. ...
Ques :27
In CE mode, the input characteristic of BJT is a variation of



CE ..... ... BJT .. .... ..... . ...... ...... ..



Ques :28
In an ntype
Semiconductor the Fermi level lies 0.3 eV below the conduction band at 300 K. If the temperature
is increased to 330 where does the new position of the Fermi level lie
0.55 eV below the conduction band
0.44 eV below the conduction band
0.33 eV below the conduction band
0.27 eV below the conduction band
n..
... .. ...... ..., ..
.... 300 K .. .... .... .. 0.3 eV .... .. ... ...... 330 K .. .....
.... .. .. .. .... . .. .... . ... ....
.... ..... .. 0.55 eV ....
.... ..... .. 0.44 eV ....
.... ..... .. 0.33 eV ....
.... ..... .. 0.27 eV ....
Ques :29
The passage of majority charge carrier from source to drain terminal takes place through the channel only
after an application of




.... ...... .. ....... .... .. ........ .... .... .... .. ... (drain) ...... .. .... .. .... ...
.... ..



Ques :30
Flow of electrons is affected by the following:1)
thermal vibrations
Impurity atoms
Crystal defects
All of these
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Ques :31
An ntype
Semiconductor is
Positively charged
Negatively charged
Electrically neutral
None of these
ntype
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Ques :32
A hole in a Semiconductor is defined as
a free electron
The incomplete part of an electron pair bond
A free proton
A free neutron
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Ques :33

As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor
Remains the same
Increases
Decreases
None of these
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Ques :34
With forward bias to an pn
function the width of depletion layer
Decreases
Increases
Remains the same
None of these
PN ..... .. . .... . . (forward bias) ... .. .. ... . .....
.... ..
.... ..
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Ques :35
A single transistor can be used to build which of the following digital logic gate
AND Gate
NOT Gate
OR Gate
NAND Gate
.... ... .. .... ... . ..... ..... (logic gate) .. ..... ... .. ..... ........ ..... ... ... ..
.... ...
... ...
.. ...
..... ...
Ques :36
A NAND Gate has:1)
LOW inputs and a High output
HIGH inputs and a HIGH output
LOW inputs and a LOW output
None of these
NAND ... ... .... ..
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Ques :37
What input values will cause an AND logic gate to produce a HIGH output
Atleast one input is LOW
Atleast one input is HIGH
All inputs are HIGH
All inputs are LOW
AND ..... ..... .. . . ... .... .. .... .... ... .. ..... ..... ... ....
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Ques :38
0.1116
0.4464
0.2232
0.8928
0.1116
0.4464
0.2232
0.8928
Ques :39
Proportional to T
Proportional to 1/T


T .. .........

1/T .. .........


Ques :40
The maximum number of electrons that can be accomodated by p orbital
is
2
6
10
4
p orbital
... .... .... .... ...... . ....... ..... .... ... .. ... ....
2
6
10
4
Ques :41
Quantum number value for 2p Subshells
are
n L 1
n L 1
n L 0
n L 0
2p ...
. (SubShell)
. ... .. ..... .. ... ......
n L 1
n L 1
n L 0
n L 0
Ques :42
Principal quantum number describes:1)
Shape of orbital
Spin of orbital
Size of orbital
Orientation of an orbital
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Ques :43
No two electrons in the same atom can have identical set of four quantum numbers The statement is known

rule
Aufbaus rule
Hund's rule
Pauli's exclusion principle

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Ques :44
Which of the following statement is wrong about electron
Its motion is affected by magnetic field
It has wave like property
It is a particle
It emits energy while moving in atomic orbit
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Ques :45
For a three dimensional crystal having N primitive unit cells with a basis of patoms
the number of optical
branches is
3
3p
3p 3
3N 3p
.. .......... ....... ... N ...... .... ... ..... p ........
.. .... .. ... .. ..... .......
....... ....
3
3p
3p 3
3N 3p
Ques :46
An atom with one outer electron having orbital angular momentum l is placed in a weak magnetic field. The
number of energy levels into which the higher total angular momentum state splits
2l
2l 1
2l
2l 1
.. ...... . ...... . ... .. ...... .. ... .... . .. ..... ..... l .. .. ...... .. .....
...... . ... ... ... ... .. ..... ... . ... ... ..... ..... . ...... ...... ... .... ... .......
....
2l
2l 1
2l
2l 1

Ques :47
Protons resonates in a high field
nuclear magnetic resonance spectrometer at frequencies close to 800 MHz.
Calculate the strength of the magnetic field of the spectrometer.
10.0 T
12.0 T
18.8 T
21.2 T
.... . 800 MHz . ... . .. ... .. . . ... ...... . ...... . ...... .......... ... ....... ....
.. .......... .. ...... . ... . ...... . ..
10.0 T
12.0 T
18.8 T
21.2 T
Ques :48
What will happen if the primary of a transformer is connected to DC supply
Transformer will operate with low efficiency
Transformer will operate with high efficiency
No effect
Transformer may start to smoke and burn
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Ques :49
What will happen if a power transformer designed for operation on 50 Hz frequency were connected to 500
Hz frequency source of the same voltage
Current will be too much high
Transformer may start to smoke and burn
Eddy current and Hysteresis loss will be excessive
No effect
.. .... ....... 50 Hz ... . .. ... .... .. .... ..... ..... .... .., .. ... .... ...... .. 500
Hz ... . .... .. ... ... ...., .. ... ....
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Ques :50
In a Ruby Laser the atoms are excited by
Ruby rod
Flash tube
Silvered mirror
Semi transparent mirror

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Ques :51








Ques :52








Ques :53
0.005 A

0.05 A
0.5 A
5 A
0.005 A
0.05 A
0.5 A
5 A
Ques :54
If peak output voltage of a full wave rectifier is 10 its DC voltage is
10.0 V
7.07 V
6.36 V
3.18 V
.. ... .... . ...... . ..... ...... 10 .... .. ... . . ...... ... ....
10.0 V
7.07 V
6.36 V
3.18 V
Ques :55








Ques :56

A plane electromagnetic wave travelling in free space is incident normally on a glass plate of refractive index
3/2. If there is no absorption by the glass, its reflectivity is

16%
20%
50%
.. .... .............. . .... .... .... ... .... ... .. .... . ... (........ 3/2 ..
...... .. .. .... .. .. .... . ... ...... ...... .. . .. .. ... ........ (reflectivity)
... ....

16%
20%
50%
Ques :57








Ques :58
Which one of the following cannot be explained by considering a harmonic approximation for the lattice
vibrations in solids

Dulong Petitt's Law
Optical branches in lattices
Thermal expansion
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Ques :59

High elastic modulus in materials arises from
High strength of bonds
weak bonds
Combination of bonds
None
.... ... . . .......... ...... .. .... .....:1)
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...... ....
...... .. ......
... .. .....
Ques :60
In which of the follwing transitions will energy change be maximum
n 5 to n 4
n 4 to n 3
n 3 to n 2
n 2 to n 1
.... ... .. ... .. ..... ... ... ....... ....... ....
n 5 to n 4
n 4 to n 3
n 3 to n 2
n 2 to n 1
Ques :61
Example for magnetic material used in data storage devices is
45 Permalloy

Cunife
Alnico
.... .... ...... ... ..... .... .... ...... . .... .. ...... ..
45 Permalloy

Cunife
Alnico
Ques :62
Choose the correct boundary conditions for a dielectric sphere placed in a free space



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Ques :63
By saying that the electrostatic field is conservative we do not mean that
It is the gradient of a scalar potential
Its curl is identically zero
The work done in a closed path inside the field is zero
The potential difference between any two points is zero
.. ..... ..... ... ..... ..
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Ques :64









Ques :65
For a good conductor skin depth varies
Directly as conductivity
inversely as conductivity
inversely as the square root of conductivity
Directly as the square root of conductivity
.. . .. .... .. .... ..... .....
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Ques :66








Ques :67




Zero



.....
Ques :68
Identify which of the following expressions are not Maxwell's equations for time varying
fields



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Ques :69
A point charge q is kept at the centre of a cylinder of length L and radius R. The flux through the curved
surface of the cylinder is



L ...... R ........ .. .. .... .. .. .. .. .. ... .. .... q ... .. .... . .. ... .. ...... ....
..... ..




Ques :70
Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately

Spheres
Planes
Paraboloids
Ellipsoids
.... .. ..., ..... ... ... .. . ..... .., .. ....... ..... .. ....... .. . .... ... ....
......
....
......
............
Ques :71
They have equal zcomponents
of momenta
They must have equal charges
They necessarily represent a particle antiparticle
pair

.... ..... .. z...
.... ..
.... .... .... .... ......
.. ...... ... .. .. .
..... ..... .. ......... .... ...

Ques :72









Ques :73
10 mA
1 mA
5 mA
15 mA
10 mA
1 mA
5 mA
15 mA

Ques :74
The charge carrier density in the depletion layer of an unbiased pn
junction is not ideally zero because of
recombination
thermal pair production
drift
diffusion
.. ........ pn
..... . .. . ... ... .... .... .... ... . .. .. . ..... .... .. .... ....
..
...:......
..... ..... . ......
.....
......
Ques :75








Ques :76
As one goes away from the center of an atom, the electron density
decreases like Gaussian
decreases exponentially
oscillates with slowly decreasing amplitude
remains constant
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Ques :77
The fine structure of atomic spectral lines arises from
electron spinorbit
coupling
nuclear spin
interaction between electron and nucleus
interaction between atoms
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......
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Ques :78
For a one electron
atom, the spectroscopic symbols for the possible energy levels of an electron with l=2 are




.. ... ...... ...... .. ...., .. ...... ..... l=2 .. .. ........ ... .... .. ....... ..... ..




Ques :79
A beam of neutral atoms passes through a SternGerlach
apparatus . Five equally spaced lines are observed.
The total angular momentum of the atom is



.... ....
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.... .. ...... .. ... ..... ..... ..




Ques :80
4 2 Raman active and 2 IR active
4 1 Raman active and 3 IR active
3 1 Raman active and 2 IR active
3 2 Raman active and 1 IR active
4 2 ... ...... ... 2 ...... ......
4 1 ... ...... ... 3 ...... ......
3 1 ... ...... ... 2 ...... ......
3 2 ... ...... ... 1 ...... ......
Ques :81
Atomic xray
region
Nuclear, Gamma ray region
Vibrational, IR region
Rotational, Microwave region
........., x
..... .....
........., .... ..... .....
......., ...... .....
......, ......... .....
Ques :82
Two homonuclear diatomic molecules produce different rotational spectra, even though the atoms are known
to have identical chemical properties. This leads to the conclusion that the atoms must be
isotopes
isobars
isotones
isomers
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.. ...........
.......
Ques :83
The total number of atoms in a unit cell of hcp structure is
4
2
6
8
hcp ...... . ... ... ... ... ........ . ... .....
4
2
6
8
Ques :84
Millar indices of the plane which cuts the three crystallographic axes in the ratio a 3b 2c
is



... .......... . .. a 3b 2c
...... ... ..... .... .. .. ..... ....... ..



Ques :85
Einstein's theory concludes that at lower temperature the specific heat of solids
drops linearly with increase in temperature
drops linearly with decrease in temperature
drops exponentially with decrease in temperature
remains constant
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... ... ... .. ... ........ .. .... ..
... ... ... .. ... .......... ... .. .. .... ..
..... .... ..
Ques :86









Ques :87

1
2
3.14

1
2
3.14
Ques :88
0.015 V
0.0015 V
0.15 V
1.5 V

0.015 V
0.0015 V
0.15 V
1.5 V
Ques :89
Which of the following is not true for pelitier's effect
It is a reversible effect
It takes place only at the junctions
It is independent of the direction of current
It may be heating or cooling effect
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Ques :90
The number of independent elastic constants in an isotropic cubic solid is
1
3
9
12
.. ........ .... ... ... ....... ........ ...... . ..... ..
1
3
9
12
Ques :91
Tetragonal
Trigonal
Hexagonal
Monoclinic
.............
...........
.......
.......
Ques :92
The temperature below which certain materials are antiferromagnetic and above which they are

paramagnetic is called
curie temperature
neel temprature
weiss temperature
faraday's temperature
.. ... ..... .... .... .. .......... . .... .. ... ..... ... ......... . .... .. ...... ..
....... ...
... ...
.... ...
...... ...
Ques :93
The susceptibility of a dimagnetic material is essentially independent of temperature
under all circumstances
as long as the electronic structure is independent of temperature.
at very low temperatures of the order of 10 K
at very high temperature
.. .. ....... . .... . ...... . ....... ... .. ..... . .. ..... . .... ..
... .............. ...
.. .. ... ............ ...... ... .. ........ ..
.... ..... ..... (10 K ... ..... .. )..
.... ... ..... ..
Ques :94
Vibrational states of a diatomic molecule are seperated by energy interval of the order of
0.001 eV
0.1 eV
10 eV
100 eV
.. ............ ... . ... .. ........ .... ... .. .... ... .. ... . .... ...... ....... .... ..
0.001 eV
0.1 eV
10 eV
100 eV
Ques :95









Ques :96








Ques :97
Stark Broadening
Collision damping
Pressure Broadening
Doppler effect
....... ........
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... ........
...... ....

Ques :98
Which of the following series is observed in absorption spectra of alkali atoms:1)
Principal only
Principal and sharp only
Principal sharp and diffuse only
Principal sharp, diffuse and fundamental
.. ........ .. ...... ...... ... .... ... .. ..... ... ..... . . .... ..
.... .....
.... ..... ... .....
.... ....., ..... ... ........
....., ....., ........ ... .....
Ques :99








Ques :100
For a face centered cubic crystalline structure the following diffraction peaks may be observed in the Xray
diffraction experiment




.. ... ... ... .... ....... ...... .. .... X
..... ...... ..... ... .... ...... ..... ..... . ....
.. .... ...





Ques :101








Ques :102
Identify the statement that is not true for ferromagnetic materials
They have a large magnetic susceptibility
They have a fixed value of relative permeability
Energy loss is proportional to the area of hysteresis loop
They lose their nonlinearity property above the curie temperature
.... ... .. ..... ... ......... . ..... .. .... ... ..... ..
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..... ....., ........ ... .. ....... .. ......... .... ..
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Ques :103









Ques :104
An electron makes a transition from the valance band to the conduction band in an indirect band gap
semiconductor . Which of the following is NOT true
There is no momentum change in the electron .
A phonon is involved in the process
A photon is involved in the process
The energy of the electron increases
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.. ....... ... .. ..... ...... .... ..
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Ques :105
If the rms current in a 50 Hz ac circuit is 5A, the value of current 1/300 seconds after its value becomes zero
will be




.. 50 Hz ....... .... ...... ... .. ..... ... .... 5A .. .... ... .. . .... .. 1/300 ..... ...
.... .. ... ....



Ques :106
The output of a stepdown transformer is measured to be 24 V when connected to a 12 watt light bulb. The
value of peak current is



.. ...... ....... .. ... 24 V .... .... .. ..... ... 12 ... .. ..... ... .. .... .... .. .....
.... .. ... ..



Ques :107









Ques :108
1 A
2 A
3 A
1.5 A
1 A
2 A
3 A
1.5 A
Ques :109









Ques :110








Ques :111








Ques :112









Ques :113
A series RLC circuit is resonant at 1 MHz. At 1.1 MHz the circuit impedence is
Capacitive
Inductive
Resistive
Minimum
.. ... RLC ...... 1 MHz .. ....... .. 1.1 MHz .. ...... . .. ..... ....
........
.......
........
.......
Ques :114

The power factor of a series LCR
circuit at resonance is
assuming resistance of inductance to be zero)
Zero
One
between zero and one
between one and infinity
.. ... LCR
...... .. ...... .. .... ...... .... ..
.. ..... ... ... ....... .. .. .... .. . ..

.....
..
..... . .. .. ....
.. . .... .. ....
Ques :115
An air core coil and an electric bulb are connected in series with an ac source . If an iron rod is put in the coil
then the intensity of the bulb will
remain same
increase
decrease
become zero
.. .... ... ....... ... .. ........ ... .. ....... .... .... .. ... .. ... .... .. .. ....... ... .. ....
. .. ... .... .. .. ... . ......
.... .....
.....
.....
..... .. ......
Ques :116









Ques :117
2/3 A
1.5 A

2 A
2/3 A
1.5 A

2 A
Ques :118
What should be the percentage increase in the impedence of an ac circuit so as to reduce power factor from
1/2 to 1/4
25%
50%
100%
200%
.. ....... .... ...... ... .. ..... ... ...... .. ... ...... . .... .... ..... .... ...... 1/2 .. ..
.... 1/4 .. ....
25%
50%
100%
200%

Ques :119








Ques :120
A wire of length L is given the shape of a circular ring and current I is flowing through it. Now if it is given the
shape of a coil having 2 turns and the same value of current flows through it, then the ratio of magnetic field
at the centre in first and second case will be
1/4
1/2
2
4
L ...... .. .. ... .. ........ ... . ... . ... .... .. ... ..... .. I .... ...... .. .. .. ... ..
2 ... ..... ....... . ... . ... ... ... .... .... ...... . .... .. .... ... ........ .... . ... .. ..
.. ...... . ... .. ...... ....
1/4
1/2
2
4
Ques :121
Which of the following is NOT true for common collector configuration of a BJT.
Input impedence is Low
Current gain is high
Voltage gain is less then 1
used for impedence matching
.... ... .. ... .. .......... ..... ........ .. ... . . ..... ... ... .... ... ..... ..
....... ........ ..... .... ..
.... ..... ... .... ..
....... ..... 1 .. .. .... ..
........ ...... .. ..... ... ... ..
Ques :122

4 V
6 V
7.5 V
12.25 V
4 V
6 V
7.5 V
12.25 V
Ques :123
Binary equivalent number of 109 is
1110101
1101101
1111111
1111101
... 109 .. ........... ....... ..
1110101
1101101
1111111
1111101
Ques :124
For an oscillating L C
R
circuit value of resistance will be




.. ...... L C
R
...... .. .. .... .. ... ....



Ques :125
Using Boolean algebra the simple form of C is
A BC
B AC
C AB
A B
...... ........ .. ..... .. C .. ... . ....
A BC
B AC
C AB
A B
Ques :126
For an amplifier voltage gain is 500 and after feedback it reduces to 100 then the feedback ratio is
0.008
0.008
0.011
0.011
..... ..... . ...... .. . 500 .. . ... ..... .. ... .. . 100 .. .... .. .. ... ..... ...... ..
0.008
0.008
0.011
0.011

Ques :127









Ques :128

AND
OR
XOR
NAND
.... .....
.. .....
.... .. .....
..... .....
Ques :129
Decade counter
Ripple counter
Ring counter
Divide by 12 counter

... ...
...... ...
... ...
12 .. ..... ...
Ques :130
Register
Counter
Full Adder
Half Adder
.......
...
..... ....
..... ....
Ques :131

NAND Gate
XOR Gate
NOR Gate
Schmidt trigger
..... .....
.... .. .....
... .....
..... ......
Ques :132
A flip flop can exist in the following number of states
One
Three
Two
Four
.. .......
(FlipFlop)
... ........ ... .. .... .. ... ..... ..
..
...
..
...
Ques :133
2
n 1
n

2
n 1

n

Ques :134








Ques :135









Ques :136
For transistor correct relation is



........ .. .... .... .... . ..




Ques :137
Ground state of V 23) is represented as



V . ..... ... ...... .... .. ....... .... ..



Ques :138
Atomic spectrum of Ca would have
Only singlet lines
Only doublet lines
Singlet and doublet lines
Singlet and triplet lines
Ca .. .......... .... ... . ..
.... .. ......
.... ...... ......
.. . ...... ......
.. . ..... ......
Ques :139









Ques :140








Ques :141
Paschen Back effect on atomic energy levels is caused by
A strong electric field
Small magnetic fields such that effect of spin orbit
interaction is large compared to the effect of magnetic field
High magnetic fields such that effect of spin orbit
interaction is small compared to the effect of magnetic field
Any magnetic field irrespective of the magnitude of spin orbit
interaction
...... ... .. ... ..... ... ..... .. .... ..
.. .... ........ .....
.. ... ......... ..... ..... .........
........ ...... .. .... ......... ..... .. .... .. ..... ..
.. ... ......... ....., ..... .... ..... ........ ...... .. .... ......... ..... .. .... .. .. ..
... .. ......... ..... .........
........ ...... .. ....... .....

Ques :142
Choose correct statement for frequency difference as one goes to higher frequency in the vibrational spectrum
of a diatomic molecule:
It stays constant
It increases
It decreases
It initially increases but then decreases
............ ... .. ....... ...... .. .... .. ... . . ... . . ... .... .. .. ... . ...... ..
.... .... ... ..
.. ..... .... ..
.. .... ..
.. .... ..
...... ... .... .. .... .... ..
Ques :143
In Stern Gerlach experiment as atoms moving along x direction
enter in the region between magnetic poles,
the magnetic field must
be constant
have a gradient along xdirection
have a gradient in the perpendicular direction
be oscillating with time
.... .....
..... ... ...... . .... .. ... ...... x
... ... . . .... ... ..... .... .. .. ...... . ...
..... .... ......
... x ..
... ... ..... .... ......
... x ..
... .. ...... ..... .... ......
... .. ... .... .... ......
Ques :144
Lead which is a type I superonductor has a superconducting transition temperature of about 7 K. At 3.5K,
respective values of its resistivity and magnetic susceptibility would be
0 0

1

0
0.5
... .. ... .. I ..... .. . ..... .. .. . ....... ..... ... .... 7K .. 3.5 K .. ...
...... . .. ....... .. ...... . ........ .... . ..
0 0

1

0
0.5
Ques :145
Curie temperature of iron is 1043 K but a block of iron extracted from a mine does not attract an iron nail at
room temperature . This is because
of multi magnetic domain structure in ferromagnetic iron
iron extracted from mine continues to be paramagnetic at room temperature
iron extracted from mine is in diamagnetic state at room temperature
more than of one the mentioned factors

.... .. ...... ..... 1043 K .. .. .. .. .... .. ..... ... .... .. .. ..... .... .. ... ..
.... . .. . . .. ...... ..... .... .. .. .. .... ..
... ..
....... .... ... ... ......... ..... ......
.... .. ....... ... .... .... .. ... .. ......... .... ..... .... ..
.... .. ....... ... .... .... .. ... .. ............. ...... ... .... ..
..... ... ...... ... .. .. .. .....
Ques :146
A Type II superconductor is characterized by value of London penetration depth to coherence length being
0
1
less than 1
more than 1
.. II ..... .. . ..... . .. ........ ..... . ...... (...... .)...... .. .. ...... .. ....... .
.... ..
0
1
1 .. ..
1 .. .....
Ques :147








Ques :148
Electronic heat capacity of metals at temperatures much below Debye temperature and Fermi temperature
has a temperature dependence as




..... ... . .. ... .. .... .... ... .. ...... . ..... .. ...... . . .. . ... .. ..... ..
..... .... ..




Ques :149
Consider an arrangement of two metal blocks with a layer of an insulating material in between them. Choose
incorrect statement
As a voltage is applied across the junction current changes linearly with voltage .
If the two metals are brought in superconducting state then even without applying any potential across the
junction a dc current will flow across the junction
An oscillatory current will flow if a DC voltage is applied across the junction
An oscillatory current will flow only if an AC voltage is applied across the junction
.. .... .... .. .... .. ...... .... . ... .. .. ...... . ....... . .... ... ... .. ...
. ....
.. ..... .. .. ... ..... ..... .... .. .. .... ....... .. ........ .... ..
.. .. ...... .. ........ ...... ... .... .... .. .. ..... .. .. ... ..... ..... ..... .. ..... .. ..
..... .. .. ... .. ...... .... .....
.. ...... .... ..... .... ..... .. .. ... .. ............. .... .... ..
.. ...... .... .... .. ..... ..... ..... .. .. ... .. ..... ....... .... .... ..
Ques :150
Madelung constant for a one dimensional chain of ions is




... . .. .. ..
.... ... .. ....... ...... ..