Solved Paper Laboratory Assistant 2018 [Part-2] – HPSSC Hamirpur

56. The physical quantity which is equal to the change in momentum of a body is known as

1. Force
2. Acceleration
3. Impulse
4. Reaction

57. A force of 5N acts on a body weight 9.8 N. What is the acceleration?

1. 49ms^-2
2. 5ms^-2
3. 49 ms^-2
4. 51 ms^-2

58. If the normal force is doubled, then the coefficient of friction is

1. Halved
2. Tripled
3. Doubled
4. Not Changed

59. Work will said to be done if the force and displacement are

1. Parallel
2. Perpendicular
3. Acting in opposite directions
4. Both A and C

60. Electron-volt is the unit of

1. Charge
2. Voltage
3. Energy
4. Acceleration

61. The momentum of a body is increased by 25%. The kinetic energy is increased by about

1. 5%
2. 25%
3. 38%
4. 56%

62. Torque acting on a body is the rotational analogue of

1. Mass
2. Force
3. Velocity
4. Kinetic energy

63. If the earth shrinks to half of its radius without change in mass, the duration of the day will be

1. 6 hours
2. 12 hours
3. 24 hours
4. 48 hours

64. A solid disc rolls down on inclined plane. The fraction of its total kinetic energy associated with its translation is

1. 2/3
2. 1/3
3. 1/2
4. ¼

65. What is moment of inertia of a cylinder of radius r, along its height?

1. Mr2/2
2. Mr^2
3. Mr^2/5
4. 2mr^2/5

66. The angle between the equatorial plane and the orbital plane of a geostationary satellite is

1. 0 degree
2. 60 degree
3. 90 degree
4. 120 degree

67.The force of gravitation is

1. Electrostatic
2. Repulsive
3. Conservative
4. Non-conservative

68. The orbit of an artificial satellite around the earth is approximately

1. Elliptical
2. Parabolic
3. Hyperbolic
4. Circular

69. Modulus of the rigidity of ideal liquid is

1. Zero
2. Unity
3. Infinite
4. None of these

70. ‘Bar’ is the unit of

1. Thrust
2. Force
3. Buoyant force
4. Pressure

71. The density of water is maximum at

1. 0 degree c
2. 4-degree c
3. 100 degree c
4. None of these

72. For an ideal conductor of heat, the value of thermal conductivity is

1. Zero
2. One
3. Infinity
4. None of these

73. A perfect black body is one whose emissive power is

1. Unity
2. Zero
3. Maximum
4. Minimum

74. Which of the following is an example of amorphous solid?

1. Glass
2. Salt
3. Sugar
4. Diamond

75. When the area of a cross-section of a pipe increases, the velocity of flow of the liquid

1. Increase
2. Decreases
3. Remains the same
4. Become zero

76. On increasing the temperature of a substance gradually, its colour becomes

1. Red
2. Green
3. Yellow
4. White

77. The value of Poisson’s ratio lies between

1. -1 to 1.5
2. -1 to 1
3. .5 to 1
4. 0 to 0.5

78. Writing on the blackboard with a piece of chalk is possible by the property of

1. Viscosity
2. Surface tension
3. Cohesive force
4. Adhesive force

79. Pressure exerted by a liquid depends upon

1. Depth of liquid
2. Density of air
3. Density of liquid
4. Both a and c

80. The change in internal energy of a system in cyclic process is

1. Positive
2. Negative
3. Zero
4. May be positive or negative

81. The sink temperature of a heat engine is 77-degree C the efficiency is 30%. The source temperature is

1. 249-degree c
2. 323 degree c
3. 123 degree c
4. 423 degree c

82. A child swinging on a sing in sitting position, stands up. Then the time period of the swing will

1. Increase
2. Decrease
3. Remains same
4. None of these

83. The distance between two consecutive notes is

1. 2l
2. l/4
3. l/2
4. l

84. The phenomenon of sound propagation in air is

1. Isothermal process
2. Adiabatic process
3. Isobaric process
4. Isochoric process

85. The loudness and pitch of a sound note depends on

1. Frequency and velocity
2. Intensity and velocity
3. Intensity and frequency
4. None of these

86. A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

1. Decreases
2. Remains unchanged
3. Become infinite
4. Increases

87. The dielectric between the conductors reduces the electric intensity

1. To zero
2. Between them
3. With non change
4. None of these

88. What is the angle between the electric dipole moment and the electric field strength due to it on the equatorial line?

1. 0 degree
2. 90 degree
3. 180 degree
4. None of these

89. The electrostatic capacitance depends on

1. Nature of the conductor
2. Size of the conductor
3. Thickness of the conductor
4. None of these

90. A hollow sphere of charge does not produce an electric field at any

1. Interior point
2. Outer point
3. Beyond 2 m
4. Beyond 10 m

91. When the separation between two charges is increased, the electric potential energy of the system

1. Remains the same
2. May increase or decrease
3. Increases
4. Decreases

92. In SI, unit of electric field is

1. Am^-1
2. Nc-1
3. Cm^-1
4. Cm^-2

93. A wire of resistance 10 ohm is elongated by 10%. The resistance of the elongated wire is

1. 10.1 ohm
2. 11.1 ohm
3. 12.1 ohm
4. 13.1 ohm

94. Ohm’s law is not obeyed by

1. Electrolytes
2. Discharge tubes
3. Vacuum tubes
4. All of these

95. Which of the following has negative temperature coefficient of resistance?

1. Germanium
2. Iron
3. Aluminium
4. Copper

96. The materials suitable for making electromagnets should have

1. High retentivity &high coercivity
2. Low retentivity & low coercivity
3. High retentivity & kiw coercivity
4. None of these

97. Domain formation is the necessary feature of

1. Diamagnetism
2. Paramagnetism
3. Ferromagnetism
4. All of these

98. One tesla is equal to

1. 10-4 gauss
2. 10^4 gauss
3. 10^-7 gauss
4. 10^-8 gauss

99. The angle between the earth’s magnetic axis and earth’s geographic axis is

1. 0 degree
2. 17 degree
3. 23 degree
4. None of these

100. The resistance of an ideal ammeter is

1. Very low
2. Very high
3. Infinity
4. None of these

101. A circuit has a resistance of 12 ohm and an impedance of 15 ohm. The power factor of the circuit will be

1. 0.8
2. 0.4
3. 1.25
4. 0.125

102. The quantity that remains unchanged in a transformer is

1. Voltage
2. Current
3. Frequency
4. None of these

103. Radio frequency choke has the core of

1. Air
2. Iron
3. Air and iron
4. None of these

104. An induction furnace works on the principle of

1. Eddy currents
2. Faraday’s laws
3. Self-induction
4. Mutual induction

105. Which of the following is the longest wave?

1. Radio wave
2. Gamma ray
3. Micro wave
4. X-rays

106. Ozone layer is present in

1. Troposphere
2. Stratosphere
3. Ionosphere
4. Mesosphere

107. Huygen’s wave theory of light cannot explain

1. Diffraction
2. Interference
3. Polarisation
4. Photoelectric effect

108. Scattering of light is a direct consequence of

1. Interference
2. Dispersion
3. Diffraction
4. Reflection

109. Doppler effect is applicable for

1. Light waves
2. Sound waves
3. Space waves
4. Both a and b

110. The unit of illumination is

1. Candela
2. Watt metre 2
3. Lux
4. Lumen

Read next: ॥ Part-3 ॥  Part-1 ॥