1. Which is the only vector quantity out of the following?
(a) Electrostatic potential
(b) Moment of a spinning body
(c) Current flowing in a metal
(d) Charge of a gold leaf electroscope
Ans: B
2. If the wavelength of incident light changes from 400 nm to 300 nm, the stopping potential for photoelectrons emitted from a surface becomes approximately
(a) 1.0 volt greater
(b) 1.0 volt smaller
(c) 0.5 volt greater
(d) 0.5 volt smaller
(e) 0.1 volt greater
Ans: A
3. Sound is propagated in air as
(a) Stationary waves
(b) Longitudinal waves
(c) Transverse waves
(d) Standing waves
Ans: B
4. Surface tension of water is 0.072 Nm−1. The excess pressure inside a water drop of diameter 1.2 mm is
(a) 0.086 Nm−2
(b) 240 Nm−2
(c) 120 Nm−2
(d) 72 Nm−2
Ans: B
5. Two radioactive nuclides x and y have half lives 1 hour and 2 hours respectively. Initially the samples have equal number of nuclei. After 4 hours the ratio of the numbers of x and y is
(a) 1/2
(b) 2
(c) 1/4
(d) 1
(e) 1/16
Ans: C
6. Frequency of characteristic X-rays depends on
(a) atomic number of target
(b) mass number of target
(c) accelerating p.d applied
(d) kinetic energy of electron
Ans: A
7. In Young's double slit experiment, the width of one of the slits is lowly increased to make it twice the width of the other slit. Then in the interference pattern
(a) the intensity of maxima increase while that of minima decrease
(b) the intensities of both maxima and minima decrease (c) the intensities of both maxima and minima remain the same
(d) the intensity of maxima and decrease while that of minima increase
(e) the intensities of both maxima and minima increase
Ans: E
8. Energy in the Sun is generated mainly by
(a) Fusion of hydrogen atoms
(b) Chemical reaction
(c) Fission of helium atoms
(d) Fusion of radioactive material
Ans: A
9. The meniscus of mercury in a glass tube is
(a) concave
(b) plane
(c) convex
(d) horizontal
Ans: C
10. In the electromagnetic spectrum, the visible spectrum lies between
(a) radio waves and microwaves
(b) infra red and ultraviolet rays
(c) micro waves and infra red spectrum
(d) X- ray and gamma ray spectrum
(e) ultraviolet and X ray spectrum
Ans: B
11. Let the potential energy of electron in hydrogen atom in the ground state be regarded as zero. Then its potential energy in the first excited state will be
(a) 20.4 eV
(b) 13.6 eV
(c) 3.4 eV
(d) 6.8 eV
(e) 10.2 eV
Ans: A
12. If the sun becomes twice as hot
(a) the output of radiated energy will be eight times larger
(b) it will radiate predominantly in the infrared
(c) it will radiate predominantly in the ultraviolet
(d) the output of the radiated energy will be eight times smaller
(e) the frequency spectrum of the radiated energy will not alter
Ans: C
13. What enables the aeroplane to rise in air?
(a) The lifting capacity of a downward jet of air
(b) The lifting capacity of an upward jet of air
(c) The low pressure above the wings
(d) The high pressure above the wings
Ans: C
14. Image formed by a convex lens is virtual and erect when the object is placed
(a) at F
(b) between F and the lens
(c) at 2F
(d) beyond 2F
(e) at infinity
Ans: B
15. A body is projected so as to have a maximum range of 80m. The wrong statement about this motion is/are
(a) its angle of projection is 450
(b) its vertical height is 20m
(c) its energy is zero at the highest point
(d) its path is a parabola
Ans: C
16. A thin circular brass disc has a concentric hole through it so as to make it a washer. It is then heated. Owing to expansion of metal, the diameter of the hole will:
(a) decrease
(b) increase
(c) remain the same
Ans: B
17. Hydrogen has
(a) One isotope
(b) Two isotopes
(c) Three isotopes
(d) None of the above
Ans: C
18. Two coherent sources whose intensity ratio is 81:1 produce interference fringes. The ratio of minimum to maximum intensity i.e: Imin : Imax is
(a) 16.25
(b) 9:1
(c) 1:9
(d) 25:16
(d) 5:4
Ans: A
19. A plate has a length 5.00 ± 0.10cm and breadth 2.00 ± 0.01 cm. Then the area of the plate is
(a) 10 ± 0.1 cm2
(b) 10.0 ± 0.01 cm2
(c) 10.0 ± 0.25 cm2
(d) 10.0 ± 0.2 cm2
(e) 10 cm2
Ans: D
20. A lump of ice floats in water in a beaker. When all the ice melts, the level of water in the beaker will
(a) go down
(b) change
(c) rise
(d) remain unchanged
Ans: D
21. The apparent change in frequency due to relative motion between source of sound and a listener is called
(a) Doppler effect
(b) Diffraction
(c) Resonance
(d) Beat phenomenon
Ans: A
22. When light wave travels from one medium into another its
(a) Velocity, frequency and wave length does not change
(b) Velocity does not change
(c) Wavelength does not change
(d) Frequency does not change
Ans: D
23. The gas law PVγ constant is true for:
(a) Adiabatic changes only
(b) Isothermal changes only
(c) Both isothermal and adiabatic changes
Ans: A
24. Which of the following particles is unstable
(a) Proton
(b) Alpha particle
(c) Neutron
(d) Electron
Ans: C
25. The power of combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is
(a) +1 diopter
(b) -1 diopter
(c) 0
(d) +0.5 diopter
(e) -0.5 diopter
Ans: E
26. In a n-p-n transistor amplifier, the collector current is 9mA. If 90% of the electrons from the emitter reach the collector, then
(a) α = 0.9; β = 9.0
(b) the base current is10mA
(c) the emitter current is 1mA
(d) α = 9.0; β = 0.9
(e) α = 0.99; β = 99.0
Ans: A
27. A ball hangs from a string inside a train moving along a horizontal straight track. The string is observed to incline towards the rear of the train making a constant small angle with the vertical. It shows that the train is
(a) moving with a uniform acceleration
(b) moving with a uniform velocity
(c) moving with a uniform retardation
(d) moving with an acceleration which is increasing uniformly
(e) at rest
Ans: E
28. The thermocouple cannot act as
(a) Thermometer
(b) Voltmeter
(c) Refrigerator
(d) a.c generator
Ans: D
29. The mean orbital radius of planet Pluto is 6 tera-meters. Then the orbital radius in terms of mega meters is
(a) 6×106
(b) 6×105
(c) 6×109
(d) 6×108
Ans: A
30. A liquid boils when its vapour pressure is
(a) greater than total external pressure on its surface
(b) equal to total external pressure on its surface
(c) equal to atmospheric pressure
(d) less than total external pressure on its surface
Ans: B
31. When a vibrating turning fork is placed on a sonometer, a large sound is heard. This is due to
(a) Forced vibration
(b) Reflection of sound
(c) Beats
(d) Resonance
Ans: A
32. The graph between acceleration and time for the particle in SHM is
(a) Sinusoidal
(b) Parabola
(c) Straight line
(d) Ellipse
Ans: A
33. In a property biased transistor
(a) both depletion layers are equally large
(b) both depletion layers are equally small
(c) emitter-base depletion layer is large but base-collector layer is small
(d) emitter-base depletion layer is small but base-collector depletion layer is large
(e) both depletion layers vanish
Ans: D
34. Maxwell in his famous equation of electromagnetism introduced the concept
(a) AC current
(b) DC current
(c) displacement current
(d) impedance
(e) reactance
Ans: C
35. Water is used in hot water bottles because:
(a) water is not harmful to human body
(b) water has high specific heat
(c) water is easily available
(d) it is not easy to heat water
Ans: B
36. Heavy water is one of the substances used as moderator in reactors. Which of the following is also used as moderator?
(a) Sea water
(b) Cobalt
(c) Graphite
(d) Titanium
Ans: C
37. Out of the following electromagnetic radiations, which has the shortest wavelength?
(a) radio waves
(b) infrared
(c) ultraviolet
(d) visible light
(e) X-rays
Ans: E
38. 92U238 decays successively to form 90Th234, 91Pa234, 92U234, 90Th230 and 88Ra226 then during the reaction the number of particles emitted is
(a) 4
(b) 3
(c) 5
(d) 2
(e) 1
Ans: B
39. If the velocity of light c, gravitational constant G the Plank's constant h are chosen as fundamental units, the dimension of length L in the new system is
(a) [h1 c1 G-1]
(b) [h1/2 c1/2 G-1/2]
(c) [h1 c-3 G-1]
(d) [h1/2 c-3/2 G1/2]
(e) [h1 c0 G0]
Ans: D
40. A dim star magnitude +14.5 explodes into a nova of magnitude +2. The factor by which the brightness of the star has increased is
(a) 12.5
(b) 102
(c) 103
(d) 104
(e) 105
Ans: E
41. A charged oil drop of mass 9.75×10-15 kg and charge 30×10-16C is suspended in a uniform electric field existing between two parallel plates. The field between the plates, taking g=10ms-2, is
(a) 3.25 v/m
(b) 300 v/m
(c) 325 v/m
(d) 32.5 v/m
(e) 3000 v/m
Ans: D
42. The transformer of an audio amplifier has out put impedance 8000Ω and the speaker has input impedance of 8Ω, the ratio of primary to secondary turns of this transformer connected between the out put of amplifier and to loud speaker should have the ratio
(a) 1000:1
(b) 100:1
(c) 1:32
(d) 32:1
(e) 1:1000
Ans: D
43. A possible fuel for nuclear reactors is
(a) Lead
(b) Plutonium
(c) Berrylium
(d) Zirconium
Ans: B
44. A monoatomic ideal gas initially at 170C is suddenly compressed to one eighth of its original volume. The temperature after compression is
(a) 170C
(b) 1360 C
(c) 8870C
Ans: C
45. For an adiabatic charge
(a) ∆u = 0
(b) ∆Q = ∆w
(c) ∆w = 0
(d) ∆u = −∆w
Ans: D
46. In a closed tube, the frequencies of the overtones are ..... multiplies of the fundamental
(a) Even
(b) Odd
(c) Sub
(d) Integral
Ans: B
47. The temperature above which a gas cannot be liquefied by the application of mere pressure is called
(a) Critical temperature
(b) Boiling point
(c) Boyle temperature
(d) Freezing point
Ans: A
48. The dimensions of angular momentum are
(a) MLT―1
(b) ML―1T
(c) ML2T―1
(d) MLT―2
Ans: C
49. The acceleration of an object moving in a straight line is equal to the
(a) Slope of the displacement - time graph
(b) Area under velocity - time graph
(c) Area under displacement - time graph
(d) Slope of the velocity - time graph
Ans: D
50. In the photocells
(a) light is converted to heat
(b) electrical energy is converted to light energy
(c) light energy is converted to electrical energy
(d) heat is converted to light
Ans: C
51. A train, 300 m long is traveling with a velocity of 144 km/hr. It passes over a bridge in 120 seconds. Then the length of the bridge is
a. 4.5 km
b. 2.25 km
c. 4.5 m
d. 2.25 m
Ans: A
52. Water has maximum density at
a. 140C
b. 100C
c. 0.40C
d. 40C
Ans: D
53. The magnifying power of a Galilean telescope in normal setting is 15 and its length is 112 cm. The focal length of its eye piece lens
a. 16 cm
b. 119 cm
c. 8 cm
d. 105 cm
Ans: C
54. A bimetallic element is a device in which two thin flat strips of different metals are rivetted together. Such a device can only be used as:
a. Thermister
b. Thermionic
c. Thermocouple
d. Thermostat
Ans: D
55. For a given kinetic energy the smallest de Broglie wavelength is for
a. proton
b. neutron
c. α-particles
d. electron
Ans: C
56. Young's interference experiment is performed with red light of wavelength 7000Ã… and the fringes formed at a distance of one metre has width β. Now red light is replaced by a light of wavelength 4000Ã…. In order that the fringes should again have the same band width β, the screen should be kept at a distance of
a. 7/3m
b. 4/7m
c. 7/4m
d. 3/7m
Ans: C
57. Two polaroids are kept crossed to each other. Now one of them is rotated through a angle of 450. The percentage of incident light now transmitted through the system is
a. 15%
b. 75%
c. 25%
d. 50%
Ans: C
58. Two capacitors 10 μF and 25 μF are charged to a potential of 100 V each. They are connected in parallel. The potential across them are
a. 100 V each
b. 200 V each
c. 50 V each
d. 80 V and 120 V
Ans: A
59. The equation of a harmonic wave is given by y = 0.05 sin (2000t − 8x)m. The maximum particle velocity of the particle in the wave is (in proper units)
a. 100
b. 10
c. 2000
d. 100
Ans: A
60. For a heat engine the temperature of the source is 1270C. To have 60% efficiency the temperature of the sink is
a. 1130C
b. −1130C
c. −2730C
d. 1600C
Ans: B
61. The temperature of a gas is produced by:
a. The kinetic energy of the molecules
b. The repulsive forces between the molecules
c. The potential energy of the molecules
d. The attractive force between the molecules
Ans: A
62. Energy generation in star is mainly due to
a. Fission of heavy nuclei
b. Chemical reactions
c. Fusion of heavy nuclei
d. Fusion of light nuclei
Ans: D
63. Using a convex lens a clear image of a candle flame is produced on a screen. How many other clear images can be received on this screen if only the lens is to be shifted?
a. Two more
b. A large number
c. Only one more
d. None
Ans: C
64. When a torque acting upon the system is zero. Which of the following will be constant
a. Angular momentum
b. Force
c. Linear momentum
d. Linear impulse
Ans: A
65. A body is perfectly elastic if
a. It can be easily deformed
b. It can be easily compressed
c. It can readily drawn into a wire
d. It recovers its original shape or volume on the removal of the deforming forces
Ans: D
66. If the units of length and force be each increased four times, the units of energy is increased
a. 16 times
b. 8 times
c. 4 times
d. 32 times
Ans: A
67. Compressed air coming out of a punctured ball becomes cooler because of
a. isothermal expansion
b. isothermal compression
c. adiabatic expansion
d. adiabatic compression
Ans: C
68. Two conducting spheres of radii 2cm and 4cm are charged. They are now kept in constant and separated. The ratio of their potential is
a. zero
b. 2:1
c. 1:1
d. 1:2
Ans: C
69. In a series LCR circuit, at resonant frequency
a. the impedance is maximum
b. the current and voltage are in phase
c. current is minimum
d. the impedance and current are maximum
Ans: B
70. In the steady state of temperature for a body, the rate of flow of heat across it depends upon:
a. Only its thermal conductivity
b. Only its thermal capacity
c. Neither on its thermal capacity nor its thermal conductivity
d. Both its thermal capacity and its thermal conductivity
Ans: A
71. The process of fission, splitting of a heavy nucleus into smaller nuclei with emission of energy etc, occurs primarily in
a. The Sun
b. Chemical reactions
c. Nuclear reactor
d. The hydrogen bomb
Ans: C
72. A storage cell of emf 10 V and internal resistance 0.1Ω, is charged with 5 amps. Then the terminal voltage is
a. 10 V
b. 9.5 V
c. 10.5 V
d. 9.9 V
Ans: C
73. On which natural phenomenon is the unit of time based?
a. Diurnal motion of the earth
b. Rotation of the sun
c. The revolution of the moon
d. Rotation of the moon
Ans: A
74. What causes 'Reverberation'?
a. Reflection
b. Refraction
c. Interference
d. Diffraction
Ans: A
75. A body of mass m is resting on an inclined plane which makes an angle θ with the horizontal. As θ increases the normal reaction of the plane
a. Decreases
b. Increases
c. Remains unaltered
Ans: A
76. Two unlike parallel forces P and 2P act at points A and B. Their resultant acts at a point
a. A
b. between A and B
c. on AB produced
d. on BA produced
Ans: C
77. When two turning forks A and B are sounded together four beats per second are heard. If the frequency of A is 256 Hz, find that of B. On loading the fork B, the number of beats decreases.
a. 252 Hz
b. 264 Hz
c. 248 Hz
d. 260 Hz
Ans: D
78. Natural magnetism of a magnetic material is explained due to
a. spin of electron
b. association with earth magnetic field
c. nucleus
d. spin and rotation of electron
Ans: D
79. The presence of dissolved impurities in water:
a. Does not affect its boiling point
b. Lowers its boiling point
c. Raises its boiling point
d. Does not let water boil
Ans: C
80. A proton has a mass of 1.67×10-27 kg and charge of 1.6×10-19 C. If the proton be accelerated through a potential difference of one million volts, then the KE is
a. 1.6×10-13 J
b. 1.6×10-15 J
c. 1.67×10-13 J
d. 1.67×10-15 J
Ans: A
81. When a light is refracted, which of the following does not change?
a. Velocity
b. Amplitude
c. Frequency
d. Wavelength
Ans: C
82. 540 gm of ice at 00C is mixed with 540 gm of water at 800C. The final temperature of the mixture in 0C will be
a. 20
b. 0
c. 40
d. 80
Ans: B
83. The process in which nuclei join to form a new nucleus and liberate heat is known as
a. Fusion
b. Fission
c. Electrolysis
d. Catalysis
Ans: A
84. Speed of the gas ejected from a rocket is 1000ms-1 and the force experienced as a result is 50 N. The mass of gas escaping per second is
a. 5 g
b. 200 g
c. 50 g
d. cannot determined
Ans: C
85. A potentiometer consists of a wire of length 4m having a resistance 10Ω. It is connected to a cell of emf 2V. The potential difference per unit length of the wire will be
a. 2 V/m
b. 5 V/m
c. 0.5 V/m
d. 10 V/m
Ans: C
86. The magnetic potential at any point on the equatorial magnet is
a. Infinite
b. Zero
c. Positive
d. Finite
Ans: B
87. A ball hangs from a string inside a train moving along a horizontal track. The string is observed to incline towards the front of the train making a small angle with the vertical. It shows that the train is
a. Moving with uniform acceleration
b. Moving with constant retardation
c. Moving with uniform velocity
d. At rest
Ans: B
88. Speed of flow of viscous liquid through a capillary tube of radius r under constant pressure head is proportional to
a. r
b. r2
c. r4
d. r−1
Ans: B
89. At the temperature of inversion, the emf in a thermocouple is
a. minimum
b. maximum
c. half the maximum value
d. zero
Ans: D
90. A number of images of a candle flame can be seen in a thick mirror. The brightest image is:
a. The last one
b. The first one
c. The second one
d. The third one
Ans: C
91. Cathode rays are
a. A stream of positive charges
b. A stream of negative charges
c. A stream of neutral particles
d. Electromagnetic waves
Ans: B
92. The dimension of entropy is
a. M0L−1T0K
b. ML2T−2K−1
c. M0L−2T0K2
d. MLT−2K
Ans: B
93. A glass prism of refractive index 1.5 will simply act as a glass slab when kept in liquid of refractive index
a. 1
b. 1.5
c. 2
d. √2
Ans: B
94. Cyclotron is used for accelerating
a. Protons
b. Lead
c. Atoms
d. Molecules
Ans: A
95. Mirage is the phenomenon due to
a. Total internal reflection
b. Interference of light
c. Polarization of light
d. Diffraction of light
Ans: A
96. Short sight is due to
a. The eye-ball being too short for the eye lens
b. A defect in the retina
c. The eye-ball being too long for the eye lens
d. A defect in the cornea
Ans: C
97. Radius of first orbit of the electron in a hydrogen atom is 0.53Ã…. Radius of the third orbit is
a. 2.12Ã…
b. 0.18Ã…
c. 4.77Ã…
d. 1.06Ã…
Ans: C
98. In a working nuclear reactor, cadmium rods are used to
a. Absorb all neutrons
b. Absorb some neutrons
c. Speed up neutrons
d. Slow down neutrons
Ans: B
99. A bullet fired from a gun has a force on it given by F=400−8×104 t, such that force becomes zero as soon as the bullet leaves the barrel of the gun. The impulse imparted to the bullet
a. 0.1 NS
b. 2 NS
c. 1 NS
d. zero
Ans: C
100. In a P-type semiconductor the acceptor impurity level are a little
a. below the valance band
b. above the conductor band
c. above the valence band
d. below the conduction band
Ans: C
101. The material used for making a permanent magnet is
a. Copper
b. Brass
c. Iron
d. Steel
Ans: D
102. A monoatomic ideal gas initially at 170C is suddenly compressed to one eighth of its original volume. The temperature after compression is
a. 170C
b. 8870C
c. 1360C
d. none of the above
Ans: B
103. The separation between an object and screen is 120cm. You are given a convex lens of focal length 25cm taking the position object as origin location of lens to form a distinct image on the screen is
a. 30 & 90 cm
b. 40 & 80 cm
c. 35.5 & 84.5 cm
d. 45 & 75 cm
Ans: C
104. When the fast moving cathode ray particles are suddenly stopped by a solid target of high melting point
a. X- rays are produced
b. β- are produced
c. α- are produced
d. Positive rays are produced
Ans: D
105. The distance between a town and a factory is 30km. A man started to walk from the factory to the town at 6.30 am. While a cyclist left the town for the factory at 6.40 am riding at a speed of 18 km/hr. The man met the cyclist after walking 6 km. The time at which they met is
a. 7.30 am
b. 8.00 am
c. 8.10 am
d. 8.30 am
Ans: B
106. Static electricity can be produced by
a. Chemical reaction
b. Friction
c. Induction
d. Both by (b) & (c)
Ans: D
107. A hollow cylinder and a solid cylinder having the same mass and same same diameter are released from rest simultaneously from the top of an inclined plane. Which will reach the bottom first
a. The solid cylinder
b. The hollow cylinder
c. Both will reach the bottom together
d. The one having greater density
Ans: A
108. The equation for a stationary wave is given by y = cosx sint. The wave length is (where x and y are in cm)
a. 2π cm
b. π/2 cm
c. 4π cm
d. π cm
Ans: A
109. The ratio of the magnetic induction to the magnetizing field is called
a. Magnetic potential
b. Hysteresis
c. Susceptibility
d. Permeability
Ans: D
110. The moment of inertia of a body about an axis is I, and its angular acceleration is α. Then I α is equal to
a. Kinetic energy
b. The angular momentum
c. The torque
d. Momentum
Ans: C
111. The objective of a microscope forms
a. virtual and enlarged image
b. virtual and diminished image
c. real and enlarged image
d. real and diminished image
Ans: C
112. The ratio of the rise in temperature of a gas when compared adiabatically to that when compressed isothermally to the same extent is
a. Depends on the gas
b. More than 1
c. Less than 1
d. Equal to 1
Ans: B
113. A cell of emf 12 volt connected across a resistor R=7Ω draws a current of 1.5A. The internal resistance of the cell is
a. 0.5Ω
b. 1Ω
c. 1.5Ω
d. zero
Ans: B
114. Sound waves in air are:
a. longitudinal
b. transverse
c. longitudinal as well as transverse
Ans: A
115. The moment of momentum is called
a. Couple
b. Impulse
c. Angular momentum
d. Torque
Ans: C
116. A biconvex lens of glass (refractive index = 1.5) has faces of radii 20 cm each. Its focal length in air is
a. 30 cm
b. 20 cm
c. 21 cm
d. 3 cm
Ans: B
117. A cable is shortened to half its length. The maximum load it can support without exceeding its elastic limit
a. Is trebled
b. Is doubled
c. Is halved
d. Does not change
Ans: D
118. Wavelength of electromagnetic wave of frequency 100 KHz
a. 5×106 m
b. 3×103 m
c. 3×108 m
d. 4×106 m
Ans: B
119. Current flowing in a copper voltmeter is 0.4 A. The number of Cu++ ions deposited at the cathode per minute is
a. 1.5×1020
b. 3×1020
c. 4.5×1019
d. 0.75×1020
Ans: D
120. When water is filled in an empty vessel, its frequency
a. remains the same
b. decreases
c. increases
d. either increases or decreases
Ans: C
121. The slopes of isothermal and adiabatic curves are related as
a. Adiabatic curve slope = ½ × Isothermal curve slope
b. Isothermal curve slope = Adiabatic curve slope
c. Isothermal curve slope = γ × Adiabatic curve slope
d. Isothermal curve slope = γ × Isothermal curve slope
Ans: D
122. A body rotating with an angular velocity 20 rad/s comes to rest in 4 seconds. The angle turned in last second of its motion is
a. 2.50
b. 5 rad
c. 200
d. 2.5 rad
Ans: D
123. The pressure exerted by an ideal gas is proportional to
a. square of the velocity of the molecules
b. the mean velocity of the molecules
c. the mean square velocity of the molecules
d. the root mean square velocity of the molecules
Ans: C
124. The refractive index is the least for
a. Green light
b. Blue light
c. Red light
d. Yellow light
Ans: C
125. Compressed air in the tube of a wheel of a cycle at a normal temperature suddenly starts coming out from a puncture. The air inside:
a. starts becoming cooler
b. may become hotter or cooler depending upon the amount of water vapour present
c. starts becoming hotter
d. remains at the same temperature.
Ans: A
126. When a mass is rotating in a plane about a fixed point its angular momentum is directed along
a. The radius
b. The tangent to orbit
c. Line at an angle of 450 to the plane of rotation
d. The axis of rotation
Ans: D
127. Two unequal resistors are connected in parallel in a circuit. Then
a. The current is the same through both of them
b. Voltage drop is the same across them
c. There will be larger potential drop across them
d. Larger current flows through the larger resistance
Ans: B
128. When a body is positively charged it means that
a. Some protons have been added to it
b. Some electrons have been removed from it
c. Some protons have been removed from it
d. Some electrons have been added to it
Ans: B
129. If the sound in hydrogen is v, then in a mixture of hydrogen and oxygen in the ratio 5:1 by volumes, the speed of sound at same temperature and pressure is
a. (6.5)½ v
b. (5/6)½ v
c. (7/3)½ v
d. (7/3)½ v
Ans: D
130. A motor car tyre is pumped to 2 atmospheres at 150C when it bursts. Assume adiabatic expansion. The drop in temperature of air is: (for air γ = 1.4)
a. -560C
b. 410C
c. 560C
d. none of the above
Ans: C
131. A flask containing air at 270C at atmospheric pressure is corked up. A pressure of 2.5 atmosphere inside the flask would force the cork out. The temperature at which it will happen is
a. 67.50C
b. 750K
c. 5770C
d. 7500C
Ans: B
132. Two tuning forks of frequencies 252 Hz & 256 Hz sounded together produce beats. The frequency of resultant wave is
a. 252 Hz
b. 4 Hz
c. 254 Hz
d. 258 Hz
Ans: C
133. The number of images formed by the mirrors inclined at 450 of an object between them is
a. Infinite
b. Seven
c. One
d. Four
Ans: B
134. Out of the following the vector quantity is
a. electric charge
b. current
c. potential
d. electric field intensity
Ans: D
135. Dry air (γ = 1.5) at atmospheric pressure is suddenly compressed to one fourth of its original volume. The pressure will be
a. 3 atmosphere
b. 6 atmosphere
c. 8 atmosphere
d. 10 atmosphere
Ans: C
136. Two thermometers X and Y have ice points marked at 150 and 250 and steam points marked as 750 and 1250 respectively. When thermometer X measures the temperature of a bath as 600 on it, Y would measure the same temperature as
a. 600
b. 750
c. 1000
d. 1050
Ans: C
137. In the above question if the volume after compression is half the original volume, the final pressure after a long time is
a. greater than twice the initial pressure
b. equal to twice the initial pressure
c. equal to the initial pressure
d. equal to half of the initial pressure
Ans: B
138. Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position with the passage of time
a. the pressure decreases
b. the pressure increases
c. the pressure remains the same
d. the pressure may increase or decrease
Ans: A
139. An adiabatic process, at constant
a. Heat
b. Temperature
c. Pressure
d. Temperature and Pressure
Ans: A
140. A body of mass 2kg is moving along a horizontal surface. A force of 4N is needed to make it move with constant velocity 10 m/s along a straight line. If 4N force is suddenly reserved while the body is in motion
a. It will come to rest with a retardation of 4 m/s2
b. It will come to rest with a retardation of 4 m/s2 and then move with constant velocity in the opposite direction
c. It will not move at all
d. It will come to rest with a retardation of 2 m/s2
Ans: A
141. The electric potential at any point inside a charged hollow sphere
a. is the same
b. is zero
c. increases with distance from the centre
d. decreases as the distance from the centre increases
Ans: A
142. Number of electrons passing through a conductor per second to constitute a current of 1 micro ampere is
a. 6.25 × 1018
b. 6.25 × 1015
c. 6.25 × 1012
d. 1.6 × 10-19
Ans: C
143. Ω-m is the unit of
a. Resistance
b. Resistivity
c. Conductivity
d. Conductance
Ans: B
144. The quality of a tone:
a. decreases with loudness
b. varies directly as pitch
c. depend upon the overtones present
d. varies inversely as the amplitude
Ans: C
145. The isothermal bulk modulus of a perfect gas at atmospheric pressure is
a. 1.03×105 N/m2
b. 1.03×106 N/m2
c. 1.03×1010 N/m2
d. 1.03×1111 N/m2
Ans: A
146. The work done in adiabatic change in a gas depends on
a. Change in pressure
b. Change in volume
c. Change in temperature
d. None
Ans: B
147. A resistor R1, dissipates the power p when connected to a certain generator. If a resistance R2 is put in series with R1, the power dissipated by R1
a. increases
b. decreases
c. may increase or decrease
d. remains the same
Ans: B
148. If the diameter of closed tube is D, the value of end correction is
a. 0.15D
b. 0.6D
c. 1.2 D
d. 0.3D
Ans: D
149. Two thin lenses whose powers are +2D and -4D respectively. The power of the combination is
a. -2D
b. -4D
c. +4D
d. +2D
Ans: A
150. Gamma rays are
a. Streams of protons
b. Streams of electrons
c. Electromagnetic waves of long wavelengths
d. Electromagnetic waves of short wavelengths
Ans: D
151. Electrons revolve in a circle with a frequency of 5 × 1014 Hz. The current due to this is
a. 5×1014 A
b. 8×10-5A
c. 3.2×10-31 A
d. zero
Ans: B
152. If the error in measurement of length and time is 2% the percentage error in velocity is
a. 1
b. 2
c. 4
Ans: C
153. At Mach number 2, the speed of an aeroplane will be:
a. half the speed of sound
b. double the speed of sound
c. four times the speed of sound
d. √2 times the speed of sound
Ans: B
154. In a stationary wave in air the variation of pressure at nodes is
a. maximum
b. minimum
c. three times the variation due to one wave alone
d. none of these
Ans: A
155. Out of the following the one without much variation of resistance with temperature is
a. copper
b. silicon
c. constantan
d. nichrome
Ans: C
156. A block has dimensions 10×8×4 cm. The ratio between maximum resistance to minimum resistance formed by the block is
a. 5:2
b. 25:4
c. 5:4
d. 1:1
Ans: B
157. The weight of an aeroplane in flight is balanced by:
a. the upthrust of air displaced
b. difference of pressure between the upper and lower surfaces of the wings created by he difference of speeds of air on the surfaces
c. vertical component of the thrust created by air currents striking the lower surface of the wings
d. force due to the reaction of gases ejected by the revolving propeller
Ans: B
158. The number which has order of magnitude 3 is
a. 5.01
b. 5000
c. 5001
d. 5.00
Ans: B
159. The weight of lead of R.D = 11 which will balance 8gm of iron of R.D = 8, when both are immersed in water is
a. 11 gm
b. 8 gm
c. 7.7 gm
d. 8.8 gm
Ans: C
160. Two copper wires have their lengths in the ratio 1:2 and radius 2:1. The ratio between their specific resistances is
a. 8:1
b. 4:1
c. 2:1
d. 1:1
Ans: D
161. The physical quantity which remains unchanged when a sound wave travels from one medium to another
a. speed
b. wavelength
c. amplitude
d. frequency
Ans: D
162. A bulb is marked 100 W, 250 V. Then
a. it always liberates 100J of light
b. it always draws 0.4 A current
c. its resistance is 625Ω
d. all the above are correct
Ans: C
163. 27 small liquid drops with radius 1 mm each are combined to form a single drop. The radius of this large drop is
a. 1 mm
b. 27 mm
c. 3 mm
d. 1.5 mm
Ans: C
164. A river is 120m wide and flows at a speed of 1 m/s. Two persons A and B can swim at 3 m/s. The approximate difference in time taken by them to cross the river if A crosses through shortest path and B in shortest time is
a. 1 s
b. 2 s
c. 3 s
d. 4 s
Ans: B
165. The tension in a sonometer wire is increased four times. The fundamental frequency becomes
a. 8 times
b. 2 times
c. 16 times
d. 10 times
Ans: B
166. The melting point of substances that contract on melting
a. decreases with increase in pressure
b. increases with increase in pressure
c. decreases at first and then increases with increase in pressure
d. is independent of pressure
Ans: A
167. A person travels along a straight road for the first half length with a velocity 40 m/s and the second half length with a velocity 60 m/s. The average velocity is given by
a. 0
b. 50 m/s
c. 48 m/s
d. 54 m/s
Ans: C
168. A spring stretched to a distance x has a PE=U. The additional energy required to stretch to a distance 2x is
a. U
b. 2U
c. 3U
d. 4U
Ans: C
169. The weight of a body in air is W. When it floats in water its weight is
a. W
b. W/2
c. zero
d. W/4
Ans: C
170. A cell is of emf 12 volts and internal resistance 2Ω. When it is short circuited the current is
a. zero
b. infinity
c. 12A
d. 6A
Ans: D
171. Two spheres of the same size are made of the same metal, but one is hollow ad the other is solid. They are heated to the same temperature:
a. both spheres will expand equally
b. the solid sphere will expand more than the hollow one
c. the solid sphere will expand but the hollow one will not
d. the hollow sphere will expand more than the solid one
Ans: A
172. The frequency of transverse vibration of a stretched string is 400 per second. If the tension is increased 4 times, its frequency will be:
a. 1600 per second
b. 100 per second
c. 200 per second
d. 800 per second
Ans: D
173. The best conductor of electric current is
a. silver
b. copper
c. aluminium
d. nichrome
Ans: A
174. A mixture of hydrogen and oxygen is taken in a container at constant temperature. The kinetic energy per molecule is
a. greater than oxygen
b. greater for hydrogen
c. same for both the gases
d. zero
Ans: C
175. Two vibrating systems are said to be in resonance if
a. their amplitudes are equal
b. their frequencies are equal
c. their damping factors are equal
d. their temperatures are the same
Ans: B
176. A boy throws an apple vertically up inside a train which is accelerating along a straight line. The apple
a. falls behind him
b. falls ahead him
c. returns straight to his hands
d. follows a parabolic path as observed by the boy
Ans: A
177. A stone projected with a velocity 100 m/s reaches the highest point in 5s. The angle of projection is
a. 00
b. 300
c. 450
d. 600
Ans: B
178. The percentage decrease in acceleration due to gravity when a body is taken to a height 32 km from the surface of the earth
a. 0%
b. 1%
c. 2%
d. 4%
Ans: B
179. When the area of cross section of a wire is halved and tension is doubled, the frequency becomes
a. same
b. two times
c. three times
d. four times
Ans: B
180. An instrument used for measuring the emf of a cell is
a. tacho meter
b. ammeter
c. metre bridge
d. volt meter
Ans: D
181. Two simple harmonic motions of same amplitude, same frequency and a phase difference of π results in the displacement of the particle along a
a. ellipse
b. circle
c. figure of eight
d. straight line
Ans: A
182. The dimensions of pressure gradient is
a. ML-2T-2
b. ML-2T-1
c. ML-1T-1
d. ML0T-2
Ans: C
183. A liquid shows capillary rise. Then its angle of contact is
a. acute
b. obtuse
c. 900
d. 00
Ans: A
184. Four equal resistances are connected to form a square. The effective resistance between any two diagonal points is 4Ω. The resistance of each side is
a. 4Ω
b. 8Ω
c. 2Ω
d. 16Ω
Ans: A
185. The following is an incorrect statement based on the first law of thermodynamics
a. The energy of an isolated system remains constant
b. The heat transfer equals the work plus the energy change
c. The heat transfer cannot exceed the work done
d. The net heat transfer equals the net work done for a cycle
Ans: C
186. When three bulbs A, B and C in the resistance ratio 1:2:3 are used separately in a house connection, the brightness is
a. largest for C
b. largest for B
c. largest for A
d. same for A, B and C
Ans: C
187. In which medium is the speed of sound maximum?
a. air
b. water
c. iron
d. interstellar space
Ans: C
188. Laplace corrected Newton's formula of velocity of sound because sound waves in air
a. Transverse
b. Propagate adiabatically
c. are longitudinal
d. propagate isothermally
Ans: B
189. A wire when connected across a source of emf liberates or dissipates 60J/s. When it is stretched to double its length, the heat liberated per second is
a. 30 J
b. 120 J
c. 15 J
d. 240 J
Ans: C
190. The excess of pressure inside one soap bubble is three times that inside a second soap bubble. Their volume are in the ratio
a. 1:81
b. 1:27
c. 1:3
d. 1:9
Ans: B
191. If the momentum of a body is increased by 60% its KE will be increased by
a. 50%
b. 100%
c. 125%
d. 156%
Ans: D
192. The order of (2)30 is approximately
a. 105
b. 109
c. 1015
d. 1020
Ans: B
193. A particle is thrown upward with a certain initial speed. It reaches the maximum height and subsequently returns back to the initial point. Through out its motion, the kinematical quantity which remains constant is
a. displacement
b. speed
c. velocity
d. acceleration
Ans: D
194. A man moves on a cycle horizontally with a velocity 4 km/hr. The rain is falling vertically with a velocity 3 km/hr. The direction in which he should hold the umbrella is
a. 370 with the vertical
b. 530 with the vertical
c. vertically
d. 450 with the vertical
Ans: B
195. The ratio of angular speeds of seconds hand and minutes hand of a watch is
a. 60:1
b. 1:60
c. 30:1
d. 1:30
Ans: A
196. The product of moment of inertia (M.I) and angular acceleration is
a. force
b. torque
c. work
d. angular momentum
Ans: B
197. A wire is drawn so that its radius becomes halved. Its new resistance
a. increases to four times
b. decreases to four times
c. increases to 16 times
d. decreases to 16 times
Ans: C
198. The difference between Cp and Cv is equal to the universal gas constant when
a. one gram of gas is heated
b. any amount of gas is heated
c. one molecule of gas is heated
d. one gram molecule is heated
Ans: D
199. Kirchoff's first law is related to
a. conservation of energy
b. conservation of momentum
c. conservation of angular momentum
d. conservation of charge
Ans: D
200. A wound watch spring
a. has no energy stored in it
b. has KE stored in it
c. has mechanical PE stored in it
d. has electrical energy stored in it
Ans: C
201. A particle is thrown upward with a certain initial speed. It reaches the maximum height and subsequently returns back to the initial point. Through out its motion, the kinematical quantity which remains constant is
a. displacement
b. speed
c. velocity
d. acceleration
Ans: D
202. The percentage change in tension necessary in a sonometer of fixed length to produce a note one octave higher than before is
a. 25%
b. 300%
c. 400%
d. 50%
Ans: B
203. Fraunhoffer lines are observed in the spectrum of
a. hydrogen discharge tube
b. a carbon arc
c. the sun
d. sodium vapour lamp
Ans: C
204. A stone of mass of 10 kg is attracted by the earth with a force of
a. 1000 N
b. 98 N
c. 9800 N
d. 980 N
Ans: B
205. The ratio of angular speeds of seconds hand and minutes hand of a watch is
a. 60:1
b. 1:60
c. 30:1
d. 1:30
Ans: A
206. Fermi is equal to
a. 10-15 m
b. 10-14 m
c. 10-17 m
d. 10-12 m
Ans: A
207. For a particular angle of projection 150 the horizontal range was found to be R. The other angle of projection which gives the same horizontal range is
a. 750
b. 1050
c. 450
d. 200
Ans: A
208. The number of degrees of freedom of a diatomic gas is
a. 2
b. 3
c. 4
d. 5
Ans: D
209. The phenomenon of Brownian movement may be taken as evidence of
a. kinetic theory of matter
b. corpuscular theory of light
c. electromagnetic theory of radiation
d. capillarity
Ans: A
210. Mirages are observed in deserts due to the phenomenon of
a. interference of light
b. total reflection of light
c. scattering of light
d. double refraction of light
Ans: B
211. Of the following the self adjusting force is
a. Sliding friction
b. Static friction
c. Dynamic friction
d. Limiting friction
Ans: A
212. The velocity of rain drop attains a steady value because of
a. viscous force exerted by air
b. surface tension effects
c. air currents in the atmosphere
d. up thrust of air
Ans: A
213. One kg of water is evaporated from 6kg of sea water containing 4% salt. The percentage of alt in the remaining solution will be
a. 1%
b. 3.33%
c. 4%
d. 4.8%
Ans: D
214. It has been postulated that there may be some particles moving with speed greater than speed of light. Such particles have been named as
a. Mesons
b. Pions
c. Tachyons
d. Photons
Ans: C
215. The earth magnetic field always has a vertical component except at the
a. magnetic equator
b. magnetic poles
c. geographical north pole
d. geographical south pole
Ans: A
216. After one α emission two β emissions
a. mass number reduces by 2
b. atomic number remains unchanged
c. mass number reduces by 6
d. (b) & (c) are correct
Ans: D
217. The energy of a wound spring is
a. chemical
b. potential
c. kinetic
d. heat
Ans: B
218. A body falling vertically downward under gravity breaks into two parts of unequal masses. The centre of mass of the two parts taken together shifts horizontally towards
a. heavier piece
b. lighter piece
c. does not shift horizontally
d. depends on the vertical velocity at the time of breaking
Ans: C
219. 24 cells each of internal resistance 0.5Ω are to be used to send a maximum current through an external resistance of 3Ω. The cell should be arranged as
a. all in parallel
b. all in series
c. 2 rows of 12 cells each
d. rows of 6 cells each
Ans: C
220. The emf of a Daniel cell is
a. 0.56 V
b. 1.08V
c. 2.56 V
d. 3.12 V
Ans: B
221. For a body which is moving along with lift with uniform velocity upwards
a. It's weight decreases
b. It's weight increases
c. It's weight remains the same
d. may decrease or increase depending on magnitude of velocity
Ans: C
222. Two waves of wavelength 50cm and 51 cm produces 12 beats per second. The velocity of wave is
a. 306 m/s
b. 331 m/s
c. 340 m/s
d. 375 m/s
Ans: A
223. When there is no external force, the shape of a small liquid drop is determined by
a. surface tension of the liquid
b. density of the liquid
c. viscosity of air
d. temperature if air
Ans: A
224. Beats are produced by two waves y1 = a sin 2000πt and y2 = a sin2008 πt. The number of beats heard per second is
a. 0
b. 4
c. 8
d. 8π
Ans: B
225. Rainbow is formed due to
a. scattering and total internal reflection
b. scattering and diffraction
c. dispersion and total internal reflection
d. dispersion and reflection
Ans: C
226. In the stable equilibrium position, body has
a. minimum kinetic energy
b. minimum potential energy
c. neither maximum nor minimum
d. maximum potential energy
Ans: B
227. A Plano-convex lens is made of refractive index 1.6. The radius curvature of curved surface is 60cm. The focal length of the lens is
a. 5 cm
b. 100 cm
c. 200 cm
d. 500 cm
Ans: B
228. An ideal heat engine exhausting heat at 270C is to have 25% efficiency. It must take heat at
a. 1270C
b. 2270C
c. 3270C
d. 6730C
Ans: A
229. If height of a man is 2m then minimum height of a plane mirror in which he can have his full the image is
a. 1/4m
b. 1/2m
c. 1m
d. 3/4m
Ans: C
230. A body starts from rest and covers a distance of 10m in first second. The distance covered by it in 4 seconds will be
a. 80m
b. 100m
c. 160m
d. 200m
Ans: C
231. A frame which is moving with constant angular velocity is
a. Inertial frame
b. Non inertial frame
c. Frame of rest
d. Newtonian frame
Ans: B
232. The unit of acceleration in SI is
a. km/hr
b. m/s2
c. cm/s
d. mph
Ans: B
233. The diameters of two planets are in the ratio of 4:1 and their mean densities in the ratio of 1:2. The acceleration due to gravity on the surface of two planets will be in the ratio
a. 4:1
b. 1:8
c. 1:2
d. 2:1
Ans: D
234. 540g of ice at 00C is mixed with with 540g of water at 800C. The final temperature of the mixture is
a. 00C
b. 400C
c. 800C
d. more than 800C
Ans: A
235. A particle initially at rest is having uniformly accelerated motion. Its velocity is plotted against displacement. The graph obtained will be
a. a straight line
b. a straight line with a negative slope
c. a parabola
d. an ellipse
Ans: C
236. Light of wave length 4000Ã… is incident on a metal plate whose work function is 2eV. The maximum kinetic energy of the emitted photo electrons would be
a. 2eV
b. 1.5eV
c. 1.1eV
d. 0.5eV
Ans: C
237. In a junction diode holes are due to
a. proton
b. neutrons
c. missing electrons
d. extra electrons
Ans: C
238. A cyclist is moving in a circular path with a uniform speed of 200 cm/s. The change in velocity after half revolution is
a. zero
b. 200 cm/s
c. 4 m/s
d. 300 cm/s
Ans: C
239. If g is the acceleration due to gravity on the earth, the acceleration due to gravity on the sun is
a. 24 g
b. 16 g
c. 32 g
d. 28 g
Ans: D
240. The unit of impulse in SI is
a. Newton-second
b. Dyne
c. Pound force
d. Watt
Ans: A
241. If momentum of a body becomes 3 times, kinetic energy becomes
a. 3 times
b. 6 times
c. 9 times
d. 27 times
Ans: C
242. The transfer ratio β of a transistor is 50. The input resistance of the transistor when used in the common emitter configuration is 1KΩ. The peak value of the collector ac current for an input voltage 0.01V peak is
a. 100 μA
b. 0.01mA
c. 500 μA
d. 50 μA
Ans: C
243. A bomb of mass 9kg at rest explodes into two pieces of masses 3kg and 6kg. The velocity of mass 3kg is 16m/s. The KE of mass 6kg in joule is
a. 96
b. 192
c. 384
d. 768
Ans: B
244. The galaxy to which our solar system belongs is called
a. milky way
b. radio galaxy
c. solar galaxy
d. dwarf galaxy
Ans: A
245. A ball is projected from the top of a tower at an angle 600 with the horizontal. What happens to the horizontal component of its velocity?
a. increases continuously
b. decreases continuously
c. remains unchanged
d. first decreases and then increases
Ans: C
246. The unit of pressure in SI is
a. Pascal
b. Pounds per square inch
c. Newton per cm2
d. Watt
Ans: A
247. A body is having uniform circular motion. A quantity that which does not remain constant is
a. angular velocity
b. velocity
c. speed
d. kinetic energy
Ans: B
248. A 200W and 100W bulbs both meant for operation at 220V are connected in parallel. Then the power consumed by them when 220V is applied will be
a. 66W
b. 33W
c. 100W
d. 300W
Ans: D
249. Time of flight of a projectile projected up with a velocity of 10m/s at an angle 300 with the horizontal is (g=10 m/s2)
a. 1/2 s
b. 1 s
c. 2 s
d. 3s
Ans: B
250. When light wave suffers reflection at the interference from air to glass, the change in phase of the reflected wave is equal to
a. 0
b. π/4
c. 2π
d. π
Ans: D
251. A car covers the first half of the distance between two places at a speed of 40 km/hr and the second half at 60 km/hr. Then the average speed of the car is
a. 50 km/hr
b. 48 km/hr
c. 100 km/hr
d. 55 km/hr
Ans: B
252. What will happen if a stream of air is blown through a tube under one of the pans of a physical balance in equilibrium?
a. the pan will go up
b. the pan will go down
c. the pan will remain unaffected
d. the pan may go up or down depending upon the metal of which the pan is made
Ans: B
253. A body moves a distance of 10m along a straight line under the action of a force of 5N. If the work done is 25J, the angle which the force makes with the direction of motion of the body is
a. 00
b. 300
c. 600
d. 900
Ans: C
254. A body travels three equal distances with speeds 10 m/s, 20 m/s and 30 m/s respectively. The average speed will be
a. 20 m/s
b. 16.36 m/s
c. 31.20 m/s
d. 25.12 m/s
Ans: B
255. Railway tracks are banked on curves so that:
a. the train may not fall down inwards
b. the weight of the train may be reduced
c. necessary centripetal force may be obtained from the horizontal component of the normal reaction due to the track
d. no frictional force may be produced between the wheels and the track
Ans: C
256. The measured mass and volume of a body are 22.42gm and 4.7 cm2 respectively with possible error 0.01gm and 0.1 cm3.
The maximum error in density is
a. 0.2%
b. 2%
c. 5%
d. 10%
Ans: B
257. The unit of energy is
a. J/S
b. Watt × Day
c. Kilowatt
d. g. cm/s2
Ans: B
258. The centre of mass of a right circular cone of height h is
a. on the axis at a distance h/4 from the base of the cone
b. on the axis at a distance h/3 from the base of the cone
c. on the axis at a distance h/2 from the base of the cone
d. on the base of the cone at its distance
Ans: A
259. A uniform metre scale initially in the vertical direction is turned through 450 with bottom end fixed. The percentage fall in its
potential energy
a. 29%
b. 42%
c. 25%
d. 33%
Ans: A
260. The density of a cube is measured by measuring mass and the length of its side. If the maximum errors in the measurement of mass and length are 3% and 2% respectively, the maximum error in the measurement of the density is
a. 1%
b. 5%
c. 7%
d. 9%
Ans: D
261. A box is dragged across a floor by a rope which makes an angle 600 with the horizontal. The tension in the rope is 200N, while
the box is dragged 20m. The work done is
a. 200 J
b. 3464 J
c. 2000 J
d. 346.4 J
Ans: C
262. A stone thrown vertically upwards from the top of a tower reaches the ground with speed 30 m/s. If the initial speed is 10 m/s, the height of the tower is
a. 10 m
b. 100 m
c. 40 m
d. 800 m
Ans: C
263. A body is released from a great height and falls freely towards the earth. Another body is released from the same height exactly one second later. Then the separation between two bodies, 2 seconds after the release of the second body is
a. 4.9 m
b. 9.8 m
c. 19.6 m
d. 24.5 m
Ans: D
264. A machine gun fires 20g bullet at the rate of 10 per second with a speed of 500 ms-1. If the mass of the gun is 10kg, the
force required to hold the gun in position is
a. 10 N
b. 100 N
c. 1000 N
d. 10 dynes
Ans: B
265. The dimensions of gravitational constant G are
a. [MLT-2]
b. [ML3T-2]
c. [M-1L3T-2]
d. [M-1LT-2]
Ans: C
266. A ball is thrown upwards and it returns to ground describing a parabolic path. Which of the following remains constant?
a. kinetic energy of the ball
b. speed of the ball
c. the horizontal component of velocity
d. the vertical component of momentum
Ans: C
267. In a circus a rider rides in circular track of radius R in the vertical plane. The minimum velocity at highest point of track will be
a. √(2gR)
b. 2gR
c. √(3gR)
d. √(gR)
Ans: D
268. A weight suspended from a spring oscillates up and down. Acceleration of the weight is zero at
a. the highest point of its path
b. the lowest point of its path
c. the middle point of its path
Ans: C
269. The product of 0.0052 × 60000 expressed in scientific notation is
a. 3.12 × 102
b. 3.12 × 10-2
c. 3.12 × 104
d. 3.12 × 10-5
Ans: A
270. When an explosive shell traveling in a parabolic path under the gravity explodes. The centre of mass of the fragments will continue to move
a. along a hyperbolic path
b. vertically upwards and then vertically downwards
c. along the original parabolic path
d. horizontally and then follows the parabolic path
Ans: C
271. The dimensions of couple is
a. [ML2T-2]
b. [MLT-2]
c. [ML1T-3]
d. [ML-2T-2]
Ans: A
272. Which among the following is the largest when the time of flight of a projectile is greatest?
a. horizontal rage
b. maximum height attained
c. angle projectile with vertical
d. both (a) and (b)
Ans: D
273. Dimensions of power are
a. [ML2T-3]
b. [M2LT-2]
c. [ML2T-1]
d. [MLT-2]
Ans: A
274. A sphere of mass 4 kg strikes a spring whose force constant is 100 Nm-1 with a speed of 2 m/s. The kinetic energy of the
sphere when the spring is compressed by 0.1 m is
a. 8 J
b. 7.5 J
c. 0.5 J
d. 8.5 J
Ans: B
275. A lorry and a car moving with the same kinetic energy are brought to rest by the application of brakes, which provides equal retarding forces. Then which of them will come to rest in a short distance
a. lorry
b. car
c. both will cover same distance
d. data inadequate
Ans: C
276. A river is flowing from west to east at a speed of 5 m/min. A man on the south bank of the river capable of swimming at
10 m/min, in still water wants to swim across the river in the shortest time. He should swim in the direction
a. due north
b. 300 east of north
c. 300 west of north
d. 600 east of north
Ans: A
277. An inclined plane makes an angle of 300 with the horizontal. A solid sphere rolling down the plane from rest without slipping
has a linear acceleration equal to
a. g/3
b. 2g/3
c. 5g/7
d. 5g/14
Ans: D
278. The mass of a gas enclosed in a glass globe is increased from M to 1.5M while the temperature remains constant. If the initial pressure was 76 cm, calculate the final pressure.
a. 114 cm
b. 50.66 cm
c. 22.8 cm
d. 19 cm
Ans: A
279. A shell at rest explodes into two pieces of equal mass. The two will be
a. at rest
b. move with different velocities in different directions
c. same velocity in opposite directions
d. same velocity in the same direction
Ans: C
280. Two vectors of equal magnitude acting at a point have resultant whose magnitude is equal to either of them. The angle between the two vectors must be
a. 00
b. 1500
c. 1200
d. 600
Ans: C
281. Two satellites A and B are orbiting around the earth in circular orbits of the same radius. The mass of A is 16 times that of B. The ratio of the period of revolution of B to that of A is
a. 1:16
b. 1:4
c. 1:2
d. 1:1
Ans: D
282. A metre stick is held vertically with one end on the floor and is then allowed to fall. The speed of the other end when it hits
the floor assuming that the end at floor does not slip and
g=9.8 m/s2
a. 3.2 m/s2
b. 5.4 m/s2
c. 7.6 m/s
d. 9.2 m/s
Ans: B
283. A spring balance shows a reading 10 N when a stone of 0.5 kg is suspended from it in a lift moving with a uniform acceleration. The reading shown with same retardation is
a. 10 N
b. 15 N
c. 0
d. none of these
Ans: A
284. Of the basic forces existing nature, the most weak force is
a. gravitational force
b. electromagnetic force
c. nuclear force
d. weak force
Ans: A
285. The period of a satellite in a circular orbit near a planet is independent of
a. the mass of the planet
b. the radius of the planet
c. the mass of the satellite
d. all the above
Ans: C
286. A block of ice is floating in a liquid of specific gravity 1.2 contained in a beaker. When the ice melts completely, the level of the liquid in the beaker
a. will not change at all
b. will go down
c. will rise
Ans: C
287. A box containing food supply is released from an airplane moving horizontally at a height of 1600 ft with a velocity of 400 ft/sec. The box will move horizontally just before striking against the earth through a distance
a. 400 ft
b. 4000 ft
c. 6400 ft
Ans: B
288. A hollow cylinder and a solid cylinder having the same mass and same diameter are released from rest simultaneously from the top of an inclined plane. Which will reach bottom first?
a. the solid cylinder
b. the hollow cylinder
c. both will reach the bottom together
d. the one having greater density
Ans: A
289. A tank of volume 60 m3 is at a height of 40m above the ground. If a pump of efficiency 60% can fill the tank in
15 minutes, the power consumed by the pump is
a. 43.55 KW
b. 43.55 W
c. 4355 W
d. 435 KW
Ans: A
290. A body of mass 1kg initially at rest explodes and breaks into three fragments of mass in the ratio 1:1:3. The two fragments of equal masses fly off perpendicular to each other with a velocity of 30 m/s. Velocity of heavier fragment is
a. 24.1 ms-1
b. 14.1 ms-1
c. 141 ms-1
d. 241 ms-1
Ans: B
291. The time period of satellite in a circular orbit of radius R is T. The period of another satellite in a circular orbit of radius 4R is
a. 4 T
b. T/4
c. 8T
d. T/8
Ans: C
292. On an application of a constant torque, a wheel initially at rest is turned through an angle of 64 radian in 8 seconds. Its angular acceleration is
a. 2 rad/s2
b. 3 rad/s2
c. 1 rad/s2
d. 4 rad/s2
Ans: A
293. In the given sets of unit which is not a unit of energy?
a. Watt hour
b. Newton-meter
c. KG ms-1
d. electron volt
Ans: C
294. The released length of a spring is 0.3m and the spring constant is 30N/m. If an external force F is used to stretch the spring from 0.1 m to 0.2 m the work done by this force is
a. 0.5 joule
b. 0.45 joule
c. 0.6 joule
d. 4.5 joule
Ans: B
295. A light body A and a heavy body B have equal linear momentum. Then kinetic energy A is
a. less than B
b. equal to B
c. zero
d. greater than B
Ans: D
296. The speedometer of a car measures
a. instantaneous speed
b. average speed
c. average acceleration
d. instantaneous acceleration
Ans: A
297. Two wires A and B of same material have their lengths in the ratio 1:2 and their diameters in the ratio of 2:1. If they are stretched with the same force, the ratio of the increase in length of A to that of B will be
a. 1:2
b. 4:1
c. 1:8
d. 1:4
Ans: C
298. A person is standing on a turn table holding a pair of heavy dumb bells, one in each hand with his arm outstretched. The table is rotating with an angular velocity ω. The person suddenly pushes the weight towards his chest. The angular velocity of the turn table will
a. become greater than ω
b. become less than ω
c. remain unchanged
d. become 2ω if the masses of the dumb bells are equal
Ans: A
299. A cube has numerically equal volume and surface area. The volume of such a cube is
a. 216 units
b. 1000 units
c. 2000 units
d. 3000 units
Ans: A
300. A particle P is moving in a circle of radius a with a uniform speed v. C is the centre of the circle and AB is the diameter.
The angular velocity of about A and C are in the ratio,
a. 1 : 1
b. 1 : 2
c. 2 : 1
d. 4 : 2
Ans: B
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