Physics Chapter 1 Entry test MCQs
51. A shell explodes into four unequal parts. Which one of the following is conserved?
a. Momentum
b. Potential energy
c. Both potential and kinetic energy
d. Kinetic energy
52. A handball is tossed vertically upward with a velocity of 19.6 meters per second. Approximately how high will it rise?
a. 25 m
b. 15 m
c. 30 m
d. 20 m
53. Which shows the correct relation between time-of-flight T and maximum height H?
a. H = 8T²/g
b. H = gT²/8
c. H = 8/gT²
d. H = 8g/T²
54. At maximum height on the trajectory which of projectile becomes zero
a. Velocity
b. Acceleration
c. Horizontal velocity
d. Vertical velocity
55. Time taken by a projectile to reach maximum height is t =
a. vi sin θ/2g
b. vi sin θ/2g
c. 2vi sin θ/g
d. vi sin θ/g
56. Two projectiles are projected at angle of 20°and 70° with same velocity which one have longer range
a. Which is fired at 70°
b. Which is fired at 20°
c. None of these
d. Both have same range
57. The path followed by a projectile is known as its
a. Cycle
b. Range
c. Height
d. Trajectory
58. A projectile is launched at point O and follows the path OPQRS, as shown. Air resistance may be neglected.
which statement is true for the projectile when it is at the highest point Q of its path?
a. The horizontal component of the projectile acceleration is zero
b. The kinetic energy of the projectile is zero
c. The horizontal component of the projectile velocity is zero
d. The momentum of the projectile is zero
59. A projectile is fired horizontally with an initial speed of 20 m/s. Its horizontal speed 35 later is
a. 60 m/s
b. 20 m/s
c. 29.4 m/s
d. 6.67 m/s
60. For which of the following angles range is maximum?
a. 60°
b. 43°
c. 30°
d. None
61. A bullet is fired horizontally from a rifle at a distance target. ignoring the effect of air resistance, what is the horizontal and vertical acceleration of the bullet?
PAST PAPER MCQS
62. A ball is just allowed to fall from the window of a moving train, it will hit the ground following.
a. Straight line path
b. Circular path
c. Parabolic path
d. Hyperbolic
63. A particle mover along the straight line. The distance x describes in time, t is given by the equation x = t3 the acceleration at t = 1
a. A = 3
b. A = 1
c. A = 4
d. A = 2
64. The vertical velocity of ball thrown upward———– with time.
a. Remains constant
b. Decreases linearly
c. Decreases parabolically
d. Doubles
65. An——— missile is called a ballistic missile.
a. Un-guided and powered
b. Un-powered and guided
c. Un-powered and un-guided
d. Powered and guided
66. A body is moving with an initial velocity of 2kms-1 After a time of 50 secs its velocity becomes 1.5kms-1 Its acceleration will be:
a. 40ms-2
b. 30ms-2
c. 10ms-2
d. 20ms-2
67. In elastic collision, when a massive body collides with light body at conditions m >> m and V2 = 0ms-1 then the change in velocity will be written as:
a. V1′ ≈ V1 ; V2′ ≈ 0
b. V1′ ≈ – V1 ; V2′ ≈ V1
c. V1′ ≈ – V1 ; V2′ ≈ 0
d. V1′ ≈ V1 ; V2′ ≈ 2V1
68. If a force of 12N is applied on a body and its momentum is changed form 60 kgms-1 to 36 kg ms-1 then find the time during, which this force acts:
a. 2 seconds
b. 1 second
c. 24 seconds
d. 12 seconds
69. Time of projectile’s flight is
a. 2vi sin θ/g
b. v2i sin2 θ/g
c. v2i sin2 θ
d. v2i sinθ/g
70. If the velocity of the body changes by equal amount in equal intervals of time, the body is said to have:
a. Uniform acceleration
b. Variable acceleration
c. Negative acceleration
d. Uniform velocity
71. For finding the height of projectile, the equation
a. 2aS = Vf² – Vi²
b. 2S = a(Vf² – Vi²)
c. a = 2S(Vf² – Vi²)
d. S = 2a(Vf² – Vi²)
72. One ball is thrown vertically upward with a velocity of 9.8 m/s. If the takes 10 seconds to reach the highest point, then the acceleration of the ball is
a. 98ms-2
b. 9.8ms-2
c. – 9.8ms-2
d. 980ms-2
73. A ball is dropped from the roof of a very tall building. What is its velocity after falling for 5.0s?
a. 49.0ms-1
b. 1.96m s-1
c. 98.0ms-1
d. 98.0ms-1
74. A projectile is launched at 45 deg to the horizontal with initial K, Energy, E. Assuming air resistance to be negligible, what will be the kinetic energy of the projectile when it reaches its highest point?
a. 0.87E
b. 0.71E
c. E
d. 0.50E
75. Weight rather than mass be used in calculating
a. The binding energy of the nucleus
b. Moment of inertia of a body
c. The gravitational force between the two bodies
d. The stress in wire due to load hanging from it