51. The bending of light around the corners of an obstacle is called
(A) Reflection
(B) Refraction
(C) Diffraction
(D) Interference
52. Which quantity has the unit “Tesla”?
(A) Electric field strength
(B) Magnetic flux
(C) Magnetic induction
(D) Magnetic field strength
53. The SI unit of pressure is
(A) Newton
(B) Joule
(C) Pascal
(D) Dyne
54. The focal length of a convex lens is positive because
(A) It converges light rays
(B) Its optical center is at the front of the lens
(C) The object is placed in front of the lens
(D) The radius of curvature is negative
55. An object weighs 6 N on the surface of the Earth. Its weight at the center of the Earth will be
(A) 3 N
(B) 0 N
(C) 6 N
(D) 12 N
56. A device used to measure atmospheric pressure is called
(A) Thermometer
(B) Hygrometer
(C) Barometer
(D) Altimeter
57. When an object moves in a circular path, the centripetal force is provided by
(A) Momentum
(B) A force acting towards the center
(C) Kinetic energy
(D) Inertia
58. The physical quantity that remains unchanged during an elastic collision is
(A) Acceleration
(B) Work
(C) Momentum
(D) Power
59. The unit of Planck’s constant is
(A) Joule
(B) Joule-second
(C) Watt
(D) Newton-second
60. When light passes from one medium to another, the property that does not change is
(A) Speed
(B) Wavelength
(C) Frequency
(D) Direction
61. Which wave property determines the pitch of a sound?
(A) Amplitude
(B) Speed
(C) Frequency
(D) Wavelength
62. In which form is energy stored in a capacitor?
(A) Electric potential energy
(B) Magnetic energy
(C) Heat energy
(D) Kinetic energy
63. The law of conservation of energy states that
(A) Energy is created by work
(B) Energy is destroyed during motion
(C) Energy remains constant but changes form
(D) Energy cannot be created or destroyed, only transformed
64. What is the main cause of the greenhouse effect?
(A) Ultraviolet rays
(B) Gamma rays
(C) Infrared radiation trapped by gases
(D) Visible light
65. The SI unit of work is
(A) Newton
(B) Joule
(C) Watt
(D) Erg
66. The speed of light in vacuum is approximately
(A) 3 × 10⁸ m/s
(B) 3 × 10⁶ m/s
(C) 3 × 10⁵ m/s
(D) 3 × 10⁹ m/s
67. The branch of physics that deals with the motion of fluids is called
(A) Hydraulics
(B) Fluid mechanics
(C) Thermodynamics
(D) Geophysics
68. Which of the following uses the principle of buoyancy?
(A) Thermometer
(B) Hydrometer
(C) Barometer
(D) Manometer
69. The principle of conservation of momentum is derived from
(A) Newton’s first law
(B) Newton’s second law
(C) Newton’s third law
(D) Law of gravitation
70. The range of a projectile is maximum when the angle of projection is
(A) 45°
(B) 60°
(C) 30°
(D) 90°
71. The angular velocity of a particle executing uniform circular motion is
(A) Constant
(B) Variable
(C) Zero
(D) Dependent on the radius
72. What is the unit of electric charge?
(A) Volt
(B) Ampere
(C) Coulomb
(D) Ohm
73. The efficiency of a Carnot engine depends on
(A) The heat absorbed
(B) The work done
(C) The heat rejected
(D) The temperature difference
74. If the amplitude of a wave is doubled, its intensity will
(A) Remain the same
(B) Double
(C) Quadruple
(D) Increase by four times
75. Which color of light travels fastest in a glass prism?
(A) Red
(B) Violet
(C) Yellow
(D) Green
76. The boiling point of a liquid depends on
(A) Its density
(B) Atmospheric pressure
(C) Heat capacity
(D) Both temperature and pressure
77. The source of solar energy is
(A) Combustion
(B) Nuclear fission
(C) Nuclear fusion
(D) Chemical reaction
78. The speed of sound is greatest in
(A) Air
(B) Water
(C) Steel
(D) Vacuum
79. The first law of thermodynamics is based on
(A) Law of conservation of momentum
(B) Newton’s third law
(C) Law of conservation of energy
(D) Law of entropy
80. If the force on an object is halved, its acceleration becomes
(A) Twice
(B) Half
(C) Zero
(D) Same
81. Electrons revolve around the nucleus due to
(A) Centrifugal force
(B) Electrostatic force
(C) Gravitational force
(D) Nuclear force
82. The image formed by a plane mirror is
(A) Real and inverted
(B) Virtual and inverted
(C) Real and erect
(D) Virtual and erect
83. When a beam of light is passed through a prism, it splits into its component colors due to
(A) Refraction
(B) Reflection
(C) Diffraction
(D) Dispersion
84. The magnetic effect of current was discovered by
(A) Newton
(B) Oersted
(C) Faraday
(D) Tesla
85. What is the function of a fuse in an electric circuit?
(A) Prevent overloading
(B) Increase voltage
(C) Convert AC to DC
(D) Generate power
86. The phenomenon of light bending around obstacles is called
(A) Refraction
(B) Diffraction
(C) Polarization
(D) Reflection
87. The resistance of a wire depends on
(A) Length and material
(B) Area of cross-section
(C) Temperature
(D) All of the above
88. An object in motion will remain in motion unless acted upon by
(A) Inertia
(B) Friction
(C) Force
(D) An external force
89. The property of a material to return to its original shape after deformation is called
(A) Plasticity
(B) Elasticity
(C) Malleability
(D) Hardness
90. The weight of an object is
(A) The force of gravity acting on it
(B) Its mass times its velocity
(C) Its density times its volume
(D) Its energy divided by height
91. Which gas is most abundant in Earth’s atmosphere?
(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Argon
92. A black hole is an object that
(A) Emits light
(B) Absorbs light
(C) Absorbs all matter and light
(D) Emits infrared radiation
93. What type of energy is stored in a compressed spring?
(A) Kinetic energy
(B) Heat energy
(C) Potential energy
(D) Magnetic energy
94. The speed of a body at rest is
(A) Zero
(B) Unity
(C) Infinite
(D) Negative
95. What is the unit of electric power?
(A) Volt
(B) Watt
(C) Coulomb
(D) Ampere
96. The Sun appears red during sunrise and sunset due to
(A) Reflection
(B) Refraction
(C) Scattering of light
(D) Diffraction
97. When a person jumps from a height, he bends his knees to
(A) Avoid injury
(B) Increase speed
(C) Reduce impact force
(D) Increase momentum
98. Sound cannot travel through
(A) Water
(B) Steel
(C) Air
(D) Vacuum
99. The resistance of a conductor increases with
(A) Increase in cross-sectional area
(B) Increase in temperature
(C) Decrease in length
(D) Decrease in resistivity
100. Which of the following is a renewable source of energy?
(A) Coal
(B) Petroleum
(C) Solar energy
(D) Natural gas
