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ROUGH WORK

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1. Energy per unit volume is dimensionally equal to

Pressure Force


Density Work


2. A particle of mass 2.2 g is traveling with a velocity of 2 m/s. The wavelength associated with the particle is h 6.6 × 10-34 Js)

1.5×10-31 m 3.0×10-35 m


15 m 20×10-15 m


3. A person weighing 50 kg is standing in a lift moving up with an acceleration 2 m/s2. His weight would be

50 kg 60.2 kg


50.4 kg 58 kg


4. 50 g bullet is fired from a 10 kg gun with a speed of 400 m/s. The recoil velocity of the gun is

4 m/s 2 m/s


5 m/s 3 m/s


5. The total momentum of two colliding bodies remains constant if the collision is

inelastic elastic


both and none


6. A man weighing 60 kg carrying 20 kg bag climbs 20 steps each of 20 cm height in 10 sec. The power of the man is

313.6 W 420.5 W


255.4 W 81.6 W


7. A block of mass 50 kg slides over a horizontal distance of 1 m and the coefficient of friction is 0.2. The work done against the friction is

66 J 75 J


68 J 98 J


8. Uncontrolled fission chain reaction is the principle of

proton bomb hydrogen bomb


atom bomb nuclear reactor


9. The radius of first orbit in the hydrogen atom is 0.5 the radius of the third orbit is

1.0 Å 4.5 Å


6.0 Å 2.0 Å


10. Asbestos sheets on roof tops will be blown away in cyclonic winds. This is explained by

Snell's law Stoke's law


Bernoulli's theorem Stefen's theorem


11. A body falling through a liquid acquires a steady velocity called as

end velocity touch down velocity


terminal velocity steady state velocity


12. A soap bubble of 10 cm radius is blown from water of surface tension 30 dynes/cm. The work done is

70.5×103 erg 75.4×103 erg


69.7×103 erg 80.5×103 erg


13. The height of a geo-stationary satellite above the earth surface is

36,000 km 3,000 km


20,000 km 16,000 km


14. A thin film of water with 0.05 mm thickness is in between two glass plates of area 100 cm2 each. Surface tension of water is 70 dyne/cm, then the force required to separate the glasses is

39×105 dyne 28×105 dyne


19×105 dyne 40×105 dyne


15. The escape velocity for a body on the earth is 11.2 km/s. If the radius of the earth is increased 4 times, then the escape velocity would be

44.8 km/s 33.8 km/s


25.7 km/s 22.4 km/s


16. The ratio of value of g on earth to that of moon is 6 1. The time period of seconds pendulum on the surface of moon is

6.8 s 7.8 s


4.8 s 5.8 s


17. The value of g is 980 cm/s2. If the unit of length is taken as 1 km and unit of time as 1 minute, then the value of g becomes

35.3 km/min2 36.2 km/min2


30.3 km/min2 980 km/min2


18. The energy equivalent of one milligram of mass in ergs is

9×1018 9×1019


9×1017 6×1020


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19. Lorentz transformation equation is reduced to Galilean transformation equation when the relative velocity between two frames of reference is

very small very large


zero infinity


20. A stone is thrown up vertically by a man and it fell into his hands after 3 sec. The initial velocity of the stone is 9.8

9.8 m/s 14.7 m/s


19.6 m/s 4.9 m/s


21. A person standing on a turntable is stretching his hands and he suddenly folds his hands close to his body then

linear momentum increases angular velocity decreases


linear momentum decreases angular velocity increases


22. The physical quantity analogous to mass in circular motion is

moment of inertia force


weight angular velocity


23. The mass of a rotating body is moment of inertia then its radius of gyration K is
1
M
K

K
M 1
MI K MI

24. 50 revolutions per second are equal to

50 rad./s 50 p rad./s


314 rad./s 620 rad./s


25. A stone of mass 2 kg strikes the ground with a K.E. of 400 J. The height from where it is dropped (neglect frictional force) 9.8

40.6 m 20.4 m


30.8 m 19.8 m


26. Oil flows through a pipe of 8 cm in diameter at an average velocity of 4 m/s. The amount of flow is

3.2 m3/s 0.032 m3/s


0.02 m3/s 0.04 m3/s


27. A torque t rotates a body through an angle .. The work done is
T
W t. W
.
t2
W W =t2.
.
28. Newton's second law of motion in case of a variable mass system can be written as (where M total mass initial and final velocities)
dVdM d dM
F M F MV
dtdt dt dt
dM d
F U MV F M
dt dt
29. A car engine develops 75 KW power when rotating at a speed of 1000 rpm. The torque of the engine (in g.cm2 is

825 750


716 520


30. When two bodies traveling with velocities v and u undergo perfectly inelastic collision, then their relative velocity is

v u v2 u2


zero


v
u
31. A particle is executing SHM. Its amplitude is 10 cm and time period is 2 sec. Find its maximum velocity.

20 cm/s 40.4 cm/s


31.4 cm/s 36.8 cm/s


32. The length of a closed pipe is l and the wavelength of fundamental note emitted is then the wavelengths of 1st, 2nd and 3rd overtones are
4l 4l 4l 2l 2l 2l




l 3l 5l


357 357
ll l
35 7
33. The velocity of sound at 0ºC is 320 cm/s. The temperature at which the velocity of sound becomes double

640ºC 819 ºC


160ºC 1320 ºC


34. Two tuning forks when sounded together give 6 beats/sec. The frequency of one of the forks is 480 Hz. The other fork is loaded with wax, the number of beats increases. The frequency of second fork is

486 Hz 474 Hz


468 Hz 492 Hz


35. A truck and car are moving in opposite directions with speeds 144 km/h and 72 km/h respectively. The truck blows a horn of 500 Hz and the frequency of sound as heard by car driver is (velocity of sound is 340

500 Hz 550 Hz


575 Hz 600 Hz


36. If the tension in a stretched string is increased then the increase in its frequency

increases v3 times increases 3 times


increases 9 times doesn't depend on the tension


..
. .
velocity of the wave is

0.04 cm/s 1250 cm/s


100 cm/s 650 cm/s


38. A rod of length 5 cm is clamped at the middle and vibrated, then its frequency is (velocity of sound is 330

65 Hz 330 Hz


33 Hz 16.5 Hz


39. The waves used in SONAR are

radio waves ultrasonic waves


microwaves X-rays


40. The shortest wavelength of ultrasonic waves emitted by bats is 0.33 cm. The height frequency emitted by it (velocity of sound is 330 cm)

102 Hz 103 Hz


104 Hz 105 Hz


tx
.. .

37. The equation of a transverse wave in a stretched string is given by
y 5sin 2
. The

0.04 50
41. The rays which form image without any aberrations are

marginal rays paraxial rays


both marginal and paraxial rays none of the above


42. The radius of curvatures of a double convex lens are 25 cm, -25 cm and the refractive index of the material is 1.5. The focal length is

15 cm 25 cm


50 cm 60 cm


43. The planes having unit positive angular magnification are called

principal planes nodal planes


focal planes central planes


44. A conversing and a diverging lens of focal length 10 cm are placed co-axially in air at 5 cm apart. The power of the combination (in dioptre) is

(D)20
45. When a lens with focal length f 20 cm and dispersive power . 0.02 is in contact with another lens of dispersive power . 0.06. If the combination is achromatic doublet, then the other lens is

convex lens of 60 cm focal length concave lens of 60 cm focal length


concave lens of 20 cm focal length convex lens of 20 cm focal length


46. When parallel rays are incident on a convex lens, the marginal rays and paraxial rays meet at different foci. This is called

coma astigmatism


spherical aberration chromatic aberration


47. The eyepieces which are used in measuring the size of the image are

Huygen's Ramsden


Both None


48. The velocity of light in air is 3× 108 m/s. If it travels in water of µ then the velocity of light in water

4×108 m/s 2.25×108 m/s


3.25×108 m/s 1.25×108 m/s


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49. Two parallel slits of 0.3 cm apart are illuminated with a source of light of wavelength 5900 A°. Fringes are observed at 30 cm away from the slits. The fringe width is

0.0059 cm 0.0059 mm


0.009 cm 0.003 cm


50. Colours exhibited by soap bubble and oil floating on water is explained by

diffraction interference


polarization reflection


51. A transparent film of glass µ 1.50 is inserted in the path of one of the interfering beams of Michelson interferometer with light source of wavelength 4800 Å. Then 500 dark fringes shift across the field. Then the thickness of the film is

1.50 mm 0.5 mm


0.12 mm 0.24 mm


52. In Fraunhofer diffraction the wavefronts are

Plane Spherical


Cylindrical Elliptical


53. The rate of variation of the angle of diffraction with the wavelength d./d. is
dispersive power of grating resolving power of grating
d.
magnification power of grating none
. .
1 2
54. .1,.2 are two wavelengths that are just resolved, . is the mean wavelength, then resolving power is
. .1 .
2
d. d.
d.

.
55. The path difference between the ordinary and extra-ordinary ray in quarterwave plate is 2. .

34
3. .


4 3
56. When elliptically polarized light is incident on a rotating Nicol prism the brightness in the field of view changes between

maximum and minimum maximum and zero


minimum to zero nochange in brightness


57. The antistoke lines in Raman effect have wavelength

greater than that of incident light equal to that of incident light


less than that of incident light none


58. To induce laser action in active medium, the system should have

minimum two energy levels minimum three energy levels


maximum three energy levels none of the above


59. The rays used in bloodless surgery

X-rays .-rays


Laser Cathode rays


60. The state of polarization of the ordinary and extra-ordinary rays coming out of a doubly refracting crystal is

partially polarized plane polarized


circularly polarized elliptically polarized


61. The wavelengths of sodium D lines are 5890 Å and 5896 Å. Minimum number of lines on the grating to resolve them in the first order

982 987


896 589


62. If P is pressure, V is volume and . is the ratio of two specific heats of gas, then the relation PV. is related

isothermal change adiabatic change


both isothermal and adiabatic change none of the above


63. If dQ is the amount of heat supplied and dW is the work done, then in isothermal process

dQ dW 0

dW
dQ


64. A reversible heat engine is made to work first between 200 ºC and 0 ºC and then between 0ºC and -200 ºC. Its efficiency is

more between 0 ºC and -200 ºC more between 200 ºC and 0 ºC


same in both ranges none of the above


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65. The entropy of a reversible cycle is

infinity zero


intermediate not stable


66. A decrease in the Helmholtz function of a system is equal to

change in temperature external work done


change in internal energy all the above


67. In a gas the transport of momentum gives rise to the phenomenon of

viscosity conduction


diffusion volume


68. Van der Waal's gas equation is obeyed by

ideal gases real gases


both ideal and real gas none


69. Joule-Thomson effect is related to

adiabatic compression adiabatic expansion


isothermal expansion isothermal compression


70. If the phase of the matter changes without change in temperature it is a

first order phase change second order phase change


third order phase change none


P .T
71. The specific heat of a solid is 5 cal/g/ºC. Then heat required to raise its temperature by 20 ºC is

150 cal 25 cal


100 cal 15 cal


72. The ratio of specific heats of a gas is 1.4. Its specific heat at constant volume is 4.96 kcal/ºK. Then the value of universal gas constant is

1.894 1.489


1.84 1.984


73. P, Tare . are the pressure, absolute temperature and density of an ideal gas, then
PT P.

constant constant


PT. constant constant


.
T
74. For the system of diatomic gas the number of degrees of freedom are


75. The mean K.E. of a gas molecule at T ºK is given by the equation 13
kT kT
2 2
2
kT 2 kT
3
76. The densities of two gases are in the ratio of 1 4. The mean free paths of the molecules are in the ratio

1 4 4 1


2 1 1 2


77. The absorptive power of a black body at all wavelengths is

zero infinity
1



1


2
78. At a given temperature the ratio of emissivity of a body to its absorptivity is equal to

absorptivity of black body emissivity of black body


permittivity of a body none


79. According to Planck's hypothesis, the harmonic oscillations in a black body emit radiation

continuously discretely


either continuously or discretely none


80. The absolute temperature of an ideal gas is a measure of its

translational K.E. vibrational energy


total energy potential energy


81. A gas does 5 J of work while expanding adiabatically. The change in internal energy is

0 -5 J


-15 J -10 J


82. A charge of 2 coulombs is kept in an electric field of intensity 4 N/C. The force experienced by it is

8 N 4 N


zero 2 N


83. The potential of the earth is

infinity zero


1 varies with location


84. The force between two equal charges is F. If the distance is increased 2 times and one of the charges is made 4 times greater, then the force between them becomes
16 F 4 F
F
85. In a coil of 3 turns the magnetic flux changes from zero to 25×10-7 Weber in 2.5 milliseconds. The induced emf is

10 mV 1mV


3 mV 2.5 mV


86. Three capacitors of capacities 1 µF, 2 µF, 3 µF are connected such that the second and third are in series and first is in parallel. The resultant capacitance is

1.1 µF 2.2 µF


3.3 µF 4.4 µF


87. A dielectric material of 4 mm thickness is kept between two plates of a capacitor and the plates are moved 3.2 mm away to restore the original capacity. The dielectric constant of the material is

3.2 5


6.4 8


88. 2 . and 3 . resistances are connected with a cell of emf 6 V. The potential drops across the resistors respectively are

3.6 V,2.4 V 3 V,3 V


2.4 V,3.6 V 2.6 V,3.4 V


89. In a closed loop if i is the current through a resistance R and E is the emf then

iR E iE R


R E iRE 0


.. ..
.. .
90. The intensity of magnetic induction at a point due to a current carrying conductor is B. If the current is doubled and distance is also doubled, then the induction is

4 B 2 B


B B/2


91. The self inductance of the coil of wire of 600 turns is 108 mH. The self inductance of the coil with 500 turns is

90 mH 100 mH


110 mH 115 mH


92. An inductance of 1 Henry and negligible resistance is connected to an ac source of 200 V and 50 Hz. The current in it is

200 A 4.6 A


6.4 A 0.64 A


93. If LCR series circuit is connected to ac source across capacitor

current leads voltage by p/2 voltage leads current by p/2


current and voltage are in phase current leads voltage by p


94. An LCR series ac circuit has the values of the resistance 400 capacitive reactance 400 . and inductive reactance 100 then the total impedance of the circuit

200 . 400 .


500 . 800 .


95. In an electromagnetic wave, the cross product of electric field E and magnetic field B gives

amplitude frequency


velocity direction of travel


96. A particle of charge 2 coulombs is passing parallel in a magnetic field 4 Tesla with a velocity 5 cm/s. The force on particle is

40 N 4 N


zero 8 N


97. AVan de Graff generator produces a potential difference of 4.8 ×106 volt. If it is used to accelerate a deuterium nucleus, the energy of the nucleus is

9.6 MeV 4.8 MeV


6.8 MeV 2.4 Me V


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98. In a cyclotron, the radius of the dees is 15 cm and the magnetic field applied is 1500 gauss. The e/m of proton is 9600 esu/g. Then the velocity of the emergent protons is

2161×107 m/s 7502 ×107 m/s


4169×107m/s 3896×107 m/s


99. The particles that are accelerated to high energies in betatron are

neutrons electrons


a-particles elementary particles


100. Hall effect can be used to determine

charge in a conductor


type of the majority charges in a conductor


thickness of a conductor


voltage across the conductor


101. The rms value of potential difference in a circuit is 120 V. Then the maximum value of potential difference nearly is

170 V 60 V


240 V 200 V


102. The magnetic moment of a substance is zero. Then it is a

diamagnetic material paramagnetic material


ferromagnetic material ferrimagnetic material


103. The permeability of a paramagnetic material is numerically

infinity 1


zero 1


104. Domain theory explains about the

diamagnetism paramagnetism


ferromagnetism ferrimagnetism


105. The energy of an electron in the first orbit in hydrogen atom is -13.6 eV and the energy of the electron in second orbit is

-6.8 eV -1.5 eV


6.8 eV -3.4 eV


106. When cathode rays are scattered by a target material then the X-rays produced are

continuous X-rays characteristic X-ray


both continuous and characteristic none


107. A light of wavelength 3000 Å is incident on a photometer. The value of its work function approximately is 6.6 ×10-34 J.s, c 3 ×108

0 eV 4.11 eV


6.2 eV 3.2 eV


108. Compton effect is experimentally observed for

visible ultravoilet


X-rays .-rays


109. The matter waves associated with a particle can travel

with the velocity of sound faster than light waves


travel slower than sound waves none of the above


110. Tunnel effect explains

a-decay ß-decay


gamma-decay all the above


111. The mass defect in formation of a nucleus having 6 nucleons is 0.012 amu. The average binding energy (in MeV is amu 931 MeV

0.02×10-3 1.86×10-3


1862×10-3 1862


112. Among the elementary particles heavy particles are

leptons baryons


mesons photons


113. The catalyst in the carbon nitrogen cycle of fusion

nitrogen carbon


oxygen helium


114. In a full-wave rectifier, the input frequency is 50 Hz, the output frequency of the rectifier is

50 Hz 100 Hz


25 Hz 200 Hz


115. A tank circuit

produces electromagnetic oscillations amplifies signals


rectifies the signals all the above


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116. The part that is used to control the flow of electrons in a triode is

plate filament


grid cathode


117. Boron is doped into a pure semiconductor material. The resulting material is

p-type p-n type


n-type insulator


118. The depletion region of p-n junction diode contains

electrons holes


no charge carriers both holes and electrons


119. In a pnp transistor, the p-n junction is forward biased, in npn transistor the n-p junction is
forward biased reverse biased
not biased either forward or reverse biased
120. Universal logic gates are
AND and OR OR and X-OR
AND and NAND NAND and NOR

ROUGH WORK


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ROUGH WORK