1. Absolute zero corresponds to this temperature on Fahrenheit scale:
*32 0F *-180
0F *-460
0F *212
0F
2. The phenomenon of pair production takes
place if the energy of photon is greater than:
*1.0 MeV
*1.02 MeV *0.051
MeV *none of
these
3. Lyman found a series of lines in the
spectrum of hydrogen atom in this region:
*Ultra Violet *Visible *Infra red *Far infra red
4. This is the most penetrating:
*Alpha particle *Beta
Particle *Gamma Ray *Positron
5. Isotope 6C14 is
mostly used in:
*Medical science *Industry *Archeology
*Agriculture
6. The force that holds the nucleons
together is called
*Nuclear Force *Coulomb’s
Force *gravitational force *weak
force
.
7. After alpha decay, the nucleus has its:
*charge number decreased by four *charge
number increased by four
* mass number decreased by four *
mass number increased by four
8. Laser produces:
*A electron beam *A
neutron beam
*A coherent beam of light *none
of these
9. In order to increase the kinetic energy an
ejected photoelectron there should be an increase in:
*frequency of radiation *wavelength
of radiation
*intensity of radiation *both
wavelength and intensity
10. The amount of heat required to raise the
temperature of unit mass of a substance through one degree centigrade is:
*Molar specific heat *Heat
capacity *Specific
Heat *Latent
Heat
11. The commercial unit of electrical energy
is:
*ohm *watt *kilo watt hour *ampere
12. As the temperature of the black body is
raised, the wavelength corresponding to the maximum intensity shifts towards:
*similar wavelength *shorter
wavelength *longer wavelength *none
of these
13. The mass of fissionable material needed
for self-sustaining chain reaction is called: ·
* Atomic mass *Critical mass *Sub-critical mass *Supercritical mass
14. The atomic number of radioactive
element is increased by the emission of:
* Alpha Particle *positive Beta Particle *Negative beta
particle *gamma rays
15. According to uncertainty principle:
*
*
*
*
16. This device is used to make the path of
ionizing particles visible:
*Geiger Muller counter *Wilson
cloud chamber
*Van Dee Graff Generator *Cyclotron
17. In treating localized cancerous tumor, a
narrow beam of this is used:
*α – Rays from Cobalt – 60 *β
– rays from Cobalt – 60
*γ – rays from Cobalt – 60 *Laser
form Cobalt – 60
18. Pentavalent impurities are
also known as:
*accepter impurities *donor
impurities *hole *electron
19. The section of transistor that supplies
charge carriers( holes or electrons) is called:
*Collector *base
*emitter *junction
20. If the number of turns in a coil is
doubled, its self-inductance will become:
*halved *doubled *threefold *Fourfold
21. Two wires of resistance R1 and R2
are connected in a series in a circuit. If R1 is greater than R2,
the heating would be:
*more in R1
*more in R2 *same in R1 and
R2 *all of these
22. These are Donor impurities:
*Li and G *Ga
and Si *Sb
and As *In and Ga
23. If m0 is the rest mass of an
electron, Pair production takes place only if the minimum energy of incident
photon is equal to:
*
*
*
*
24. In Pair-production the electron and
positron move in opposite direction to conserve:
*momentum *charge *energy *mass
25. Hole in a semiconductor is actually the:
*Electron *Positron *Helium nucleus *vacancy in the valance band
26. The speed of electromagnetic wave is given
by:
*
*
*
*
27. A Geiger counter contains:
*Argon and Alcohol *Argon
only *Alcohol only *Water Vapors
28. The track formed in Wilson Cloud
Chamber due to beta particles is:
*a thin and broken line * at thick and continuous line
* scattered dots * a
thick and broken line
29. A frame of reference is called inertial if
it is:
*Rotatory *accelerated *vibratory *Moving with uniform velocity
30. The binding energy of deuteron (1H2)
is 23 Mev, its binding energy per nucleon will be:
*11.5 MeV *0.2
MeV *1 MeV *0.51 MeV
31. The de Broglie hypothesis is:
*
*
*
*
32. In a semi conductor, the energy gap between
the valance band and conduction band is:
*narrow
*wide *not present *10-6 ohm
meter
33. If
the conventional electric current is flowing from top to bottom in a wire then
the direction of the magnetic lines of induction will be:
*antiparallel to the wire *anticlock
wise
*Parallel to the wire *clockwise
34. To convert Galvanometer into voltmeter:
* A high value resistance is connected in series * A high value resistance is connected
in parallel
* A low value resistance is connected in series * A low value resistance is connected
in parallel
35. This one is used as fuel for conventional
nuclear reactor:
*92U235 *90Th227 *94Pu239 *88Rs223
36. The half life of radium is 1600 years.
After 6400 years, the sample of surviving radium will be its:
*1/4th *1/8th *1/ 16 th *half
37. The sensitivity of Galvanometer is
increased by:
* Increasing Magnetic Field * Decreasing area of
coil
* Decreasing
number of turns in coil * Making
suspension wire thick
38. If the number of electrons in excited state
exceeds than the number of electrons in the ground state then this will occur:
*Excitation potential *Population
inversion *excitation energy *Ionization energy
39. In Laser, the lifetime of an electron in
metastable state is of the order of:
*10-8s *10-5s *10-3s *10-1s
40. The principle of laser production is:
*Stimulated emission *Stimulated
emission
*Stimulated absorption *Spontaneous
emission
41. The ratio of the radius of 3rd orbit in
hydrogen atom to the radius of 1st bohr orbit is:
*12:1 *3:1 *6:1 *9:1
42. If
temperature of cold body is decreased, the efficiency of Carnot engine will:
*Decrease *Increase *Remain constant *Becomes zero
43. The method of finding the age of specimen
by C14 is called:
*artificial radioactivity *Radio
carbon dating
*half life *radiography
44. The rate of flow of blood in the human body
can be traced by using this radio isotope:
*20Ca48 *6C12 *1H3 *11Na24
45. The average translational Kinetic energy
per mole of molecules of a gas is:
*3/2 KT *2/3
KT *3/2
RT *2/3
RT
46. Electrical conductor contains:
*Only free electrons
*Only bounded electron
* Both free and bounded electrons * Neither free nor bounded electrons
47. The application of electric potential
across the diode is called:
*doping *biasing *impurity addition *potential barrier
48. The area enclosed by P – V diagram of a
Carnot cycle represents:
*energy loss due to leakage *useful
work
*heat absorbed *Heat
rejected
49. The Capacitance of parallel plate capacitor
does not depend upon:
*Nature of Plates *Area of
Plates
*Distance between plates *Medium between plates
50. Three capacitors of 3 micro Farad each are
connected in series the equivalent capacitance of circuit is:
*3μF *1μF *6μF *9μF
51. Two equal charges each of one coulomb are
held 1m apart in free space exert a force of magnitude:
* One Newton * 9 X 109 N * 8.85 X 10-12N * 6.67·X 10-11
N
52. The core of transformer is laminated to
reduce the loss
*Flux leakage *Eddy current * Copper loss * hysteresis loss
53. tesla(T) is the unit of:
* potential difference *energy *torque *magnetic flux density
54. In an isothermal expansion, the Entropy of
the system:
*Increases *Decreases *Becomes zero *Remains constant
55. Two steam engines A and B have their
sources at 600 0C and 400 0C and their sinks at 300 0C
and 200 0C respectively:
*They are equally efficient *A
is more efficient than B
* B is more efficient than A *If
their sinks are interchanged, their efficiencies will not change.
56. A device consisting of ammeter, voltmeter
and ohmmeter is called:
*Potentiometer *Multimeter *CRO *VTVM
57. X - rays are produced if heavier atoms are
bombarded by:
*Protons
* Electrons * Neutrons * Positrons
58. The radius of the 1st orbit of hydrogen
atom is:
* 0.53 nm * 0.053nm * 0.0053nm * 0.00053nm
59. An instrument which can measure and compare
potentials without drawing any current from the circuit is known as a/an:
*Ammeter *Voltmeter *Potentiometer *AVO-meter
60. A particle of mass “m” and charge “q” is to
be held motionless between two parallel and horizontal charged plates. The
electric field intensity between the plates will be:
*
*
*
*
61. The electrical energy dissipated as heat in
a resistor is:
*V2R *V2Rt *I2Rt *I2R
62. A battery of e.m.f. (E) has an internal
resistance (r). If current (I) is drawn from it, then its terminal potential
drop (V) is given by:
*V = E – Ir *V
= E + Ir *V =
IR *V = Er
63. Pn junction diode works as an insulator if
connected:
*to AC source *in
forward bias *in reverse bias *all of these
64. Emitter base junction is forward biased in:
*Neither PNP and NPN transistor *NPN
transistor
*PNP transistor *Both
PNP and NPN transistor
65. In Compton’s scattering experiment, the
scattered photon has a:
*frequency less than that of incident photon *Frequency greater than that of
incident photon
*same frequency as that of incident photon *wavelength shorter than that of
incident photon
66. In
adiabatic expansion, the internal energy of the gas:
*remains the same *decreases *becomes zero *increases
67. Concave magnetic poles, with a fixed soft
iron cylinder in moving coil galvanometer, make the magnetic field:
*weak *radial *zero *infinite
68. When the condition R1/R2 = R3/R4 is
satisfied I a Wheatstone bridge, the current in the galvanometer become:
*Zero *maximum *half *Double
69. This is a high resistance instrument:
*Voltmeter *Ammeter *Galvanometer *Motor
70. In this process no heat enters or leaves
the system:
*Isochoric *Isobaric *adiabatic *Isothermal
71. When an electron falls from the 3rd
orbit to its 1st orbit in the hydrogen atom, the line spectrum
obtained belongs to:
*Bracket series *Lyman
series *Balmer
series *Paschen
series
72. The wavelength of x ray is in the region:
*0.01 nm to 0.1 nm *1
A to 100 A *0.1 A to 1 m *0.1
nm to 1.0 nm
73. Heat energy can’t be measured in:
*Joule *B.T.U *Kelvin *Calorie
74. The electric intensity inside a hollow
sphere is given by:
*
*
*
*zero
75. The path of a neutron, moving
perpendicularly through a magnetic field, is:
*Straight line *Circular *Oval *Sinusoidal
76. The practical application of phenomenon of
mutual induction is:
*AC Generator *Transformer *Rectifier *Dynamo
77. If length of wire of potentiometer is
increased, the accuracy in the determination of null point:
*increases
*decreases *remain the same *becomes zero
78. Meter bridge is used to measure:
*current *voltage *resistance *capacitance
79. As time passes, the rate of decay of a
radioactive element:
*decrease *remains
constant *Increase *Becomes infinity
80. In electric circuits, Rheostat can be
largely used as the:
*source of current *source
of potential
*potential divider *power
supply
81. Decreasing the separation between two
identical charges by one-half causes the repulsive force to become:
*One-fourth *half *Double *fourfold
82. The resistivity of material is 
, if area of the cross section of material is
doubled and area is halved the resistivity of conductor is
*Increases 2 times *increases
4 times *remains same *is one forth
83. The magnitude of drift speed of
electron is of the order of:
* 0.1 m/s * 0.01 m/s *
0.00 1m/s * 0.000 1
m/s
84. This is not a scalar quantity:
*Electric flux *Electric
Intensity *E.M.F *Electric Potential
85. Joule per coulomb is:
*Farad *Henry *Ampere *Volt
86. The number of electrons in one coulomb is:
*6.1 x 1020 *6.1 x 1018 *6.25
x 1018 *6.1
x 1019
87. The relation 
represents:
* Gauss ‘Law *Electric
flux *Electric Intensity *Potential difference
88. Resistors of 35 ,5Ω and 7Ω are connected in
parallel. If the P.D. across 5Ω resistor is 6 volts, the P.D. across 7Ω
resistor will be:
*3 volts *6
volts *9
volts *12 volts
89. An electron of mass “m” and charge “e”
is accelerated by a potential difference of “v”, its speed will be
*
*
*
*
90. In step down transformer:
*Ns>NP *NP>NS *NS=NP *NS/NP=1
91. Resistance of a current carrying wire does
not depend on the:
*Temperature *Length *Area *Electric Current
92. The emf of the combination of the three
cells, each of 2 volts, connected in parallel will be:
*6V *3/2V *2V *8V
93. One kilowatt hour energy is equal to:
*3.6 x 105 J *36
x 105 J *746 W *6.3 x 105
J
.
94. If the speed of a conductor, moving in a
uniform magnetic field perpendicularly is increased, the induced emf:
*increases *decreases *Remains constant *becomes zero
95. When an A.C. generator is converted into
D.C generator slip ring is replaced by:
*a dynamo *a
split ring *a field coil *an inductor
96. The energy radiated per second per unit
area from the surface of a block body is directly proportional to its absolute
temperature raised to power:
*One *Two *Three *Four
97. The product of decay constant (λ) and half
life (T1/2) of a radioactive source is:
*0.369 *0.396 *0.693 *0.963
98. In law of Radioactive decay
,
represents:
* wavelength *half
life *decay constant *none of these
99. A small quantity of radioactive Iodine 53I151
is taken in food, most of it is deposited in the:
*Thyroid glands *Bones *Brain *Stomach
100. If radioactive Calcium, 20Ca45
is taken by man or animal, this percentage of it deposits in the bones of young
one:
*20 *60 *90 *100
thanks sir
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ReplyDeleteSir solve nahii hy
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