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PHYSICS MCQS
ANS KEY IS AT THE END
41. The three laws of motion were first publishes in 1687 by Sir Isaac Newton in his work
(a) Method of Fluxions (b) Optics
(c) Philosophie Naturalis Principia Mathematica
(d) Arithmetic Uniersalis
42. According to which law of motion forces in nature occur in pairs? (single isolated force is not possible).
(a) first law (b) second law
(c) third law (d) none of the above
43. Newton’s third law fails in certain cases of
(a) electrostatics (b)
electronics
(c) springs (d) both a and b
(c) springs (d) both a and b
44. If two different masses have same momentum, then the lighter one has more
(a) K. E. (also more velocity) (b) potential energy (P.E.)
(c) both K.E. and P.E. (d) none of the above
45. Two bodies of 1 kg and 4 kg are moving with equal K.Es. The ratio of the magnitudes of their linear momenta is
(a) 1: 4 (b) 8: 1
(c) 1 : 16 (d) 1 : 2
46. Which of the following is the magnitude of the gravitational force and is not the inherent property of body?
(a) mass (b) weight
(c) speed (d) length
47. Fig. below shows displacement of a body going along the x-axis as a function of time. The force acting on the body is zero in the region.
(c) CD (d) DE
48. A jar containing water in placed in a train. The train accelerates from left to right. Which of the following figures
shows the water level in a jar correctly?
49. Two objects A and B are thrown upwards simultaneously with the same speed. The mass of A is greater than that of B. Let air friction is constant
(a) A will go higher than B
(b)
B will go higher than A
(c) the two bodies will reach the same height
(c) the two bodies will reach the same height
(d) none of the
above
50. Superman throws a 2400-N boulder at an adversary. What force must be apply to that stone to give it a horizontal acceleration of 12 m/s2?
(a) 244 N (b) 294 N (c) 2940 N (d) 29400 N
51. If the vector sum of forces on a body is not zero, the body
(a) accelerates (b) decelerates
(c) remains at rest (d) none of the above
52. Planets move around the sun due to
(a) centrifugal force (b) centripetal force
(c) gravitational pull between them (d) none of the above
53. Two bullets A and B have masses 1kg and 2kg respectively.
(a) the k.E of B wil be twice that of A
(b) the K.E. of A will be twice that of B
(c) K.E. will be the same
(d) none of the above
54. Both linear momentum and K.E. are conserved in
(a) elastic collision (b) inelastic collision
(c) both of the above (d) none of the above
55. A collision in which the two bodies stick together after the collision is
(a) elastic collision (b) inelastic collision
(c) both a and b (d) none of the above
56. The velocity of an object when projected from the earth in order to escape the earth’s gravitational field is called the
(a) terminal velocity (b) average velocity
(c) instantaneous velocity (d) escape velocity
57. Which of the following is not an elastic collision?
(a) a man jumps on a cart
(b)
a bullet embedded in a block
(c) collection of two glass balls
(c) collection of two glass balls
(d) none
of the above
58. A shell explodes and many pieces fly off in different directions. The following is conserved
(a) momentum (b) K.E.
(c) both of the above (d) none of above
59. When the velocity of a body is doubled, which one is doubled too?
(a) K.E. (b) acceleration
(c) momentum (d) P.E.
60. K.E. of a body of mass m and momentum p is given by
(a) p^2m (b) m^2/2p
(c) mp (d) p^2/2m
61. If the K.E. of a body becomes four times of
its initial value ,the new momentum will be
(a) half (b) same
(c) double (d) four times
62. Two bodies of mass mA and mB have equal K.E.. The ratio of their momentum is
(a) √ mA: √mB (b) mA:mB
(c) mA^2 : mB^2 (d) mB: mA
63. Which of the following quantities is zero about the centre of mass of a body?
(a) mass (b) acceleration
(c) moment d) angular acceleration
64. Where should be the center of gravity of a body?
(a) it must be within the body
(b) it may be near but not essentially within the body
(c) it must be outside the
body
(d) it changes its position after some time
65. If the earth stopped rotating, the weight of objects at either pole would
(a) be greater (b) be less
(c) vary with latitude (d) be the same before
66. The force of gravity between two objects does not depend upon
(a) the constant of gravitation (b) the separation
(c) the product of their masses (d) the sum of their masses (SHM)
67. The term “radius of gyration” relates to
(a) moment of force (b) moment of inertia
(c) law of gravitation (d) simple harmonic motion
68. The escape velocity
(a) is independent of mass of the body
(b) increases with the increase of mass of the body
(c) decreases with the decrease of the body mass
(d) depends upon the type of body used
69. What will happen to the force of gravity if the mass of one of the objects is tripled?
(a) triple the original force of gravity
(b) divide by 1/3rd of the original gravitational force
(c) the gravitational force will remain the same
(d) none of the above
70. If you have a hocky puck sliding along a table, it will
eventually come to a stop. Which Newton’s law this example illustrate?
a) 1st b) 2nd
c) 3rd d) none of these
71. Which Newton’s law states the need to wear seatbelts?
(a) 1st law (b) 2nd law
(c)
3rd law (d)
none of these
72. What is another name of the Newton’s 1st law?
(a) law of mass (b) law of inertia
(c) law of velocity (d) law of acceleration
73. Which of the Newton’s laws does this example illustrate. The blood in your head rushes to your feet, when riding on an elevator that is descending and abruptly stops?
(a) Ist (b) 2nd
(c) 3rd (d) none of these
74. German astronomer Kepler described the motion of planets in ______ laws
(a) 2 (b) 3
(c) 4 (d) 5
75. Which law of Kepler states that the planets revolve around the sun in then elliptical orbits with sun at one of the two foci?
a) 1st b) 2nd
c) 3rd d) none of these
76. Which of the Kepler’s law is called the harmonic law?
a) 1st b) 2nd
c) 3rd d) none of these
77. A region of space from which nothing (not even light) can escape is called
(a) nova (b) black hole
(c) white hole (d) none of these
78. What is the period of geostationary satellite?
(a) 0 hour (b) 12 hours
(c) 18 hours (d) 24 hours
79. A wheel is 1m in diameter. When it makes 30 RPM the linear speed of a point on its circumference (in m/s) is
(a) π (b) π/2
(c) 30π (d) 60π
80. The angular speed of the second’s
hand of a watch in rad/see is
(a) π (b) π/3
(c) π/2 (d) π/30
45. d 46. b 47. a 48. c
49. a 50. c 51. a 52. b
53. a 54. a 55. b 56. d
57. c 58. a 59. c 60. d
61. c 62. a 63. c 64. b
65. d 66. d 67. b 68. d
69. a 70. a 71. a 72. b
73. a 74. b 75. a 76. c
77. b 78. d 79. b 80. d
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