ROUGH WORK

1. Dimensions of self inductance is

MLT-2A-3 ML2T-1A-2


ML2T-2A-2 MLT-2A0


2. When the momentum of a body increased by then the kinetic energy is increased by

25% 50%


56.25% 75%


3. The distance between the two nuclei of HCl is 1.27 A0. If the mass of chlorine atom is 37 times than that of hydrogen, then the centre of mass of the system is at this distance from the hydrogen nucleus

1.20 A0 1.24 A0


1.35 A0 1.42 A0


4. The centre of mass of a body

Lies always outside body May be within, outside or on the surface


Lies always inside the body Lies always on the surface of the body


5. The equinoxes of the Earth are

21 March, 22 September 22 March, 21 September


2 July, 10 June 10 August, 8 May


6. A satellite is geostationary in a particular orbit. It is allowed to be taken in another orbit having orbital radius two times to that of the earth. Time period in the second orbit is

48 hrs. 24 hrs.


48 v2 hrs. 2000 hrs.


7. Two satellites of masses 50 kg and 100 kg revolve round the earth in the circular orbits of radii 9R and 16R. If R is the radius of the earth, the speed of the satellites are in the ratio

3/4 4/3


9/10 16/9


8. A spinning top is an example of

Uniform circular motion Precessional motion


Oscillatory motion Translatory motion


9. Central forces are

Gravitational forces Electromagnetic forces


Conservative forces Non-conservative forces


10. Given that Poisson's ratio for silver is 0.39 and its Young's modulus is 7.2×1010 N/m2. The
bulk modulus of the silver is 11×1010 N/m2 5.2×1010 N/m2 3.2×1010 N/m2 1.2×1010 N/m2
11. The Pitot tube works on the principle of Prevost's theorem Bernoulli's theorem Maxwell's theorem Stoke's theorem
12. The Galilean transformations are
tz; ty; zvt; yxx tz; ty; yvt c x
tz; ty; yvt c xx tz; ty; zx vt; yx

13. If the distance of each plate is 2 m and the wavelength of monochromatic radiation is 4000 A0, then the expected fringe shift in Michelson-Morley experiment is

0.1 0.01


0.001 1.00


14. The value of coefficient of restitution in perfectly elastic collision

0.5 2
15. The moment of inertia of a solid cylinder of mass m and radius b about its own axis is

1/2 mb2 2 mb2


1/2 m2b2 zero


16. The rocket works on the principle of

Conservation of mass Conservation of charge


Conservation of angular momentum Conservation of linear momentum


17. Two tunning forks A and B produce 6 beats per second when sounded together.When B is loaded slightly with wax the beats reduced to 4 per second. If the frequency of A is 512 Hz, then the frequency of B is

506 Hz 516 Hz


508 Hz 518 Hz


18. If the velocity of the sound is 350 m/s. The wavelength of ultrasonic wave of 70 kHz frequency is

5m 5 × 10-3 m


5 × 10-3 km 5 km


p
19. Lissajou's figures obtained by combining x a sin .t and y sin(.t is
2

An ellipse Straight line


Circle Parabola


20. If the tension is increased 4 times, length is doubled and area of cross-section is reduced 4 times for a stretched string, then fundamental frequency becomes

Half One third


Four times Twice


21. If the mass of the particle is m and . is damping constant, then the time constant is

m . 2m/.


./m None of these


22. The particle executing SHM when it passes through mean position, it has

Maximum K.E. and maximum P.E. Maximum K.E. and minimum P.E.


Minimum K.E. and minimum P.E. Minimum K.E. and maximum P.E.


23. The types of waves in a sonometer wire is

Longitudinal progressive waves Transverse progressive waves


Longitudinal stationary waves Transverse stationary waves


24. The length of a pendulum changes from 1 m to 1.21 m. The percentage of the change in its period is

20% 10%


50% 49%


25. The period of a compound pendulum about an axis though the centre of gravity is

Minimum Infinity


Maximum Zero


26. Which of the following have damped vibrations

The oscillations of simple pendulum in vacuum


The oscillations of a simple pendulum in oil


The oscillations of a swing maintained by a periodic force


None of the above


27. The velocity of the sound in air is 350 ms-1. The length of an open pipe in fundamental mode in resonance with a source of 700 Hz is

0.25 m 0.75 m


0.5 m 1m


28. The rate of decay of the amplitude of damped vibration depends on

Force constant Phase


Frictional force Velocity of sound


29. The resonance is very sharp when

Q factor is small Q factor is medium


Q factor is high Q factor is constant


30. The magnitude and the velocity of a simple harmonic oscillator is maximum in

Over damping Critical damping


Resonance No damping


31. A tuning fork of frequency 320 Hz is sounded on a resonance tube. The first and second resonances are obtained at 20 cm and 73 cm. Then the velocity of sound is

360 m/s 380 m/s


339 m/s 400 m/s


32. Bats can detect their obstacles in darkness with the help of

Ultrasonic waves Infrasonic waves


Light waves All the above


33. X-axis of a quartz crystal is

Optical axis Electrical axis


Mechanical axis Principal axis


34. Ultrasonic waves are detected in thermal detector from

Change of temperature


Change of pressure


Change of electric resistance of the hot filament


Change of entropy


35. Magnetostriction means

Change of magnetism with temperature Change of mass with magnetic field


Change of length with magnetic field Change of magnetic poles


36. The work done by the centripetal force in one complete revolution is

Zero


Product of the centrifugal force and mass of the body


Product of the centrifugal force and radius of the circle


Impossible to calculate


37. A man is standing on rotating table with his hands stretched out. If he suddenly lowers his arms, then angular velocity

Remains constant Decreases


Increases and then decreases Increases


38. A swimmer while jumping into water from a height easily forms a loop in air if

He pulls his arms, legs in He spreads his arms and legs


He keeps himself straight None of these


39. The ratio of the total energy to the rotational energy of a uniform circular disc rolling on a horizontal plane is

2 1 1 1


1 3 3 1


40. When a body is vibrating at a frequency other than the natural frequency then, vibrations are

Forced vibrations Free vibrations


Damped vibrations None of these


41. The system matrix of an optical system is

The product of translation and refractive matrices


The sum of the translation and refractive matrices


Equals to the translation matrix


None of these


42. For nodal points which one of the following is correct

They have unit negative angular magnification


They have unit positive angular magnification


They don't lie on the principle axis


The distance between two nodal points doesn't equal to the distance between the principle points


43. The achromatic doublet with two lenses separated by a distance equal to the mean of their focal lenses is used in

Microscope Telescope


Eyepiece All the above


44. Two thin converging lenses of powers 5 diopters and 4 diopters are placed co-axially 10 cm apart. Then the focal length of the combination is

14.3 cm 1.43 cm


4 cm 10 cm


45. The sign of the spherical aberration produced by a concave lens is

Negative Positive


Neutral None


46. For coma which of the following is correct

The image formed is not in a perfect focus


The image formed has comet like shape


More than one image is formed


The image formed is multicolored


47. The focal lengths of a convergent lens made of glass having refractive index for violet and red colors are fv and fr, respectively, then
f f f f
vr vr
f f f nf
vr vr
48. As the diameter of the objective lens of a telescope increases, the resolution of the telescope

Decreases Increases


Remains the same Depends on the focal length of the lens


49. In a plane transmission grating, if the width of the ruled and unruled portions are made equal, then

2nd order spectrum will be shifted 2nd order spectrum will be absent


1st order spectrum will be absent All the above


50. Sound waves generally show diffraction effects, the reason is

The nature of the sound waves is different than that of light


Sound is a transverse as well as a longitudinal distribution


Wavelength of sound is large


Wavelength of the sound is very small


51. A calcite crystal is placed over a dot on a piece of paper and rotated. On seeing through the calcite, one will see

Two rotating dots Two stationary dots


One dot only One dot rotating about the other


52. Unpolarized light can be converted into a partially polarized light or plane polarized light by several processes. Which of the following does not do that

Reflection Diffraction


Double refraction Scattering


53. Which of the following is a uniaxial crystal

Quartz Aragonite


Topaz All the above


54. Which of the following experiment is based on the division of wavefront

Newton's rings Michelson's interferometer


Biprism All the above


55. In Lloyd's mirror experiment the central fringe is dark since the phase change between the direct and reflected rays is

0 p/2


2p p


56. Fabry-Perot interferometer works on the principle of

Reflection at a single surface


Multiple beam interference


Interference due to division of wavefront


Diffraction


57. The dispersive power of a grating is

Proportional to the wavelength Proportional to the separation of lines


Proportional to intensity of light used Independent of incident light


58. He-Ne laser is a

Two level laser Four level laser


Three level laser None of these


59. In a Ruby laser population inversion is achieved by

Electrical pumping Chemical reaction


Optical pumping All the above


60. Raman shift is

Independent of frequency of incident radiation, but depends on scatterer


Independent of scatterer, but depends on the frequency of incident radiation


Independent of both the frequency of the incident radiation and scatterer


Dependent on both the frequency of the incident radiation and scatterer


61. In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas released 20 J of heat and 8 J of work done on the gas. If the initial energy of the gas was 30 the final internal energy level will be

18 J 20 J


58 J 28 J


62. Zeroth law of thermodynamics corresponds to

Conversion of heat into work Conversion of work into heat


Heat lost equal to heat gained Existence of temperature of the body


63. A monoatomic gas expanded adiabatically and the pressure is reduced to one eighth. Then the ratio of final volume to initial volume is
29/5 25/9

23/5 25/3

64. 20 g of water at 0oC is mixed with 40 g of water at 10oC. The temperature of the mixture is

-20 oC 6.6 oC


5oC 10 oC


65. A diatomic gas undergoes same change of temperature by two different processes, at constant volume and at constant pressure. The amounts of heat supplied in the two cases are in the ratio

1 1 3 2


5 7 7 5


66. A man feels iron and wooden blocks equally cold or hot at

98.6 oC 98.6 oF


212 oC 80 oC


67. Two balls of same material and the same surface finish have their diameters in the ratio 1:2. They are heated to the same temperature and then are left in a room to cool by radiation, then the rate of cooling

Will be same for both the balls


For larger ball is half that of the other ball


For larger ball is twice that of other ball


For larger ball is four times that of the other ball


68. The mean free path of gas at constant temperature is inversely proportional to

Pressure Square root of pressure


Square of pressure Cube of pressure


69. A Carnot refrigerator takes heat from water at 0oC and discards it to the surroundings at temperature of 27oC. If 100 Kg of water at 0oC is to be changed to ice, what is the required work in joules (Latent heat of ice 3.4 ×105 joules/kg)

4.36 × 106 joules/kg 3.36 × 106 joules/kg


5.36 × 106 joules/kg 6.36 × 106 joules/kg


70. A black body radiates energy at the rate of E watt/m2 at a high temperature T oK. When the temp. is reduced T/2 oK, the radiant energy will be

E/2 2E


E/4 E/16


71. Find the quantity of heat required to increase the volume of 1 litre of air at N.T.P. to double its volume at constant pressure. Density of air at N.T.P. is 0.001293 gcm-3, specific heat of air at constant volume 0.618 cal g-1 oC-1

83 cal 92 cal


Zero 12.6 cal


72. In a diesel engine, the cylinder compresses air from approximately standard pressure and temperature to about one-sixteenth the original volume and a pressure of about 50 atm. What is the temperature of the compressed air

835 K 853 K


558 K 658 K


73. When dQ calories of heat supplied to a gas its internal energy is increased by dU Joules and work done by the gas is dW joules, then

dU dQ dW dU dQ dW


dU dQ/J dW dU JdQ dW


74. The slopes of isothermal and adiabatic curves are related as

Isothermal curve slope adiabatic curve slope


Isothermal curve slope . adiabatic curve slope


Isothermal curve slope 1/. × adiabatic curve slope


Adiabatic curve slope 1/2 × isothermal curve slope


75. A vessel is filled with an ideal gas at a pressure of 10 atmospheres and temperature of 27 oC. If half of the mass is removed from the vessel and temperature of the remaining gas is increased to 87 oC, then the pressure of the gas in the vessel will be

3 atm 6 atm


7 atm 8 atm


76. At 0 oC fluids are assumed to have

Minimum entropy Maximum entropy


Zero entropy Fixed value of entropy


77. A second order phase transition is characterized by

Latent heat


A discontinuous change in its specific heat


A change in volume


Irreversible behavior during warming and cooling


78. If the temperature of the gas molecules is increased to 4 times of its value, then the r.m.s. speed of the molecules will be

Quadrupled Doubled


Halved Unchanged


79. The specific heat of an electron gas

Approaches the value 3/2 R at low temperatures


Increases linearly at high temperatures


Approaches the value 3/2 R at high temperatures


None of these


80. The law that governs the ratio of spectral emissive and absorptive powers of a body at a given temperature is called as

Wien's law Stefan's law


Kirchoff's law Displacement law


81. In the charge distribution shown in the figure below, the electric field at Gaussian surface shown in dotted lines will be due to the total charge of
+2C


14 C 2 C


6 C 10 C



82. When a water bubble is charged

It contracts


It expands


It does not undergo any change in size


None of these


83. It requires 50 µJ of work to carry a 2 µC charge from the point R to S. Then the potential difference between the points is

25 V 60 V


70 V Zero


84. Two capacitors, C1 3 µF and C2 6 µF are connected in series and charged by connecting a battery of voltage 10 V in series with them. If they are disconnected from the battery, and connected together, then the charge on each capacitor become

Q1 30 µC, Q2 60 µC Q1 60 µC, Q2 30 µC


Q1 Q2 0 Q1 Q2 5 µC


85. What is the magnitude of polarization of a dielectric material which is kept in electric field of
0.15 MV/m and . e 4.25, e0= 8.85 × 10-12 C/m

5.64 µC/m2 0.562 µC/m2


7.24 µC/m2 Zero


86. In a millikan oil drop experiment, an oil drop carries four unit electric charges and has a mass of 1.8 × 10-12g. It is held almost at rest between two horizontal charge plates of 1.8 cm apart. Then the voltage between the charge plates is 1.6 ×10-19 g 980 cm/sec2)

469 V 750 V


50 V 90 V


87. A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B0 such that B0 is perpendicular to the plane of the loop. The magnetic force acting on the loop is

irB0 2pirB0


zero iB0


88. A He2+ ion travels at right angles to a magnetic field of 0.80 T with a velocity of 105 m/s. Find the magnitude of the magnetic force on the ion

2.56 × 10-14 N 0.256 × 10-14 N


3.56 N 6.34 × 10-14 N


89. In an ac circuit the inductive reactance is 20 the capacitive reactance is 60 the resistance is 30 .. Then the value of impedance in the circuit is

120 . 100 .


99.9 . 50 .


90. If the Q factor of the coil .0L/R is measured by varying the frequency

The plot between Q and frequency is linear


The value of Q initially decreases with increase of frequency and afterwards increases with increase of frequency


The value of Q initially increases with increase of frequency and afterwards decreases with increase of frequency


The Q value is constant with frequency


91. The direction of propagation of electromagnetic wave is given by

E . B E


B E × B


92. The Hall coefficient of a metal is low. It means that

The charge carrier density in that metal is high


The charge carrier density in that metal is low


The Hall field produced in that metal is high


The conductivity of that metal is zero


93. The Curie's law holds for

Diamagnetic substances Paramagnetic substances


Ferromagnetic substances All substances


94. The radius of the first orbit of hydrogen atom is

1.5 Ao 0.40 Ao


0.5 Ao 0.3 Ao


95. When the Bohr's formula is used to calculate ionization energy of helium it is found to be higher than the experimentally measured value due to

Electron-electron interaction Spin-orbit interaction


Spin-spin interaction None of these


96. As the wavelength of the X-rays is smaller than that of visible light, the speed of X-rays in vacuum is

Same as that of the visible light Larger than that of the visible light


Smaller than that of the visible light None of these


97. The difference between the soft and hard X-rays is of

Velocity Intensity


Frequency Polarization


98. Photoelectric effect can be explained on the basis of

Wave theory of light Corpuscular theory of light only


Still remains unexplained Quantum theory alone


99. In Compton effect

The wavelength of the scattered photon is larger than the incident photon


The K.E. of the electron is largest when the incident and scattered photons moves in opposite direction


The electron can acquire a kinetic energy equal to the energy of incident photon


All above


100. Weak nuclear force acts on

Both hadrons and leptons Hadrons only


Leptons only All charged particles


101. Which of the following material can be used as an alternate fuel in the fusion process
U238 K86
92(B) 36
N14 Th232


102. Typical energies released in the nuclear fission and nuclear fusion per event are respectively

50 MeV and 1000 MeV 200 MeV and 1000 MeV


5000 MeV and 1000 MeV 200 MeV and 10 MeV


103. The quarks are supposed to exist in following number of flavours

Two Four


Six Sixteen


104. Find the de Broglie wavelength of a neutron traveling at a speed of 2200 m/s 6.63 × 10-34 mn 1.67 × 10-27 kg)

0.18 nm 1.8 nm


80 nm 100 nm


105. Which of the following statement is wrong

Neutrino has spin 1/2 Neutrino has zero rest mass


Neutrino does not interact with matter Neutrino has charge equal to 1.6 × 10-19 C


106. One Bequeral is defined as

1 disintegration per sec 106 disintegrations per sec


3.7 × 1010 disintegrations per sec 103 disintegrations per sec


107. The particle which easily penetrates through the nucleus of an atom is

Electron Neutron


Proton Alpha particle


108. In a triode, the plate potential increases by 24 V to hold constant plate current when the grid potential changes from -1.8 to V. Then the amplification factor of the triode is

10 30


20 0.05


109. In a p-n junction the depletion region is created by

Ionization Diffusion


Recombination All of the above


110. When a voltmeter is placed across a forward biased diode, it will read a voltage approximately equal to

The bias battery voltage The diode barrier voltage


0 V The total circuit voltage


111. A 60 V peak full wave rectified voltage is applied to a capacitor input filter. If f 120 Hz, RL 10 k. and C 10 µF, the ripple voltage is

0.6 V 6mV


5 V 2.88 V


112. When operated in cutoff and saturation regions, the transistor acts like a

A linear amplifier A switch


A variable capacitor A variable resistor


113. For the operation as an amplifier, the base of an npn transistor must be

Positive with respect to the emitter Negative with respect to the emitter


Negative with respect to collector 0 V


114. An oscillator differs from an amplifier because

It has more output It requires no input signals


It requires no dc supply It always has the same output


115. For oscillations to occur, the gain around the feed back circuit must initially be

Zero One


Less than one Greater than one


116. The cathode of a zener diode in a voltage regulator is normally

More positive than anode More negative than anode


At +0.7V Ground


117. A diode that has a negative resistance characteristics is the

Schottky diode Tunneldiode


Laser diode Hot-carrier diode


118. The OR gate operation can be produced with

Two AND gates Three AND gates


Three NAND gates One NOR gate


119. The active devices used in digital circuits generally operate as

Waveform generator Rectifiers


Switches Amplifiers


120. In an npn transistor circuit, the collector current is 15 mA. If 95 percent of the electrons emitted reach the collector, then the base current is

0.79 mA 0.79 A


5.0 mA 0A


ROUGH WORK