11th class (Fsc) Physics unit 5 MCQs
51. Moment of inertia of hoop is:
a. 2/5mr2
b. mr2
c. 1/12mr2
d. 1/2mr2
52. Choose the quantity which plays the same role in angular motion as that of mass in linear motion:
a. Moment of inertia
b. Angular acceleration
c. Angular momentum
d. Torque
53. In rotational motion the analogous of mass is:
a. Moment of inertia
b. Angular momentum
c. Force
d. Inertia
54. Momentum of inertia of rod is:
a. I = 1/12 m2L
b. I = 1/12 mL2
c. I = 2/5 mL2
d. None of these
55. Moment of inertia?
a. 2/5 mr2
b. mr2
c. 1/12 mr2
d. 1/2 mr2
56. Moment of inertia is measured in:
a. Rad s-1
b. Kg m2
c. Joule second
d. Kg m-2
57. The angular version of F=ma is:
a. L= r𝛼
b. L= Iꞷ
c. F= mv/t
d. r= I𝛼
58. The ratio of moment of inertia of a disc and sphere of same radius is:
a. 1/2
b. 2/5
c. 5/2
d. 5/4
59. Moment of inertia of a solid sphere is:
a. 2/5mr2
b. mr2
c. 1/3mr2
d. 1/4mr2
60. Angular momentum has the same unit as:
a. Linear momentum x time
b. Impulse x distance
c. Work x frequency
d. Power x time
61. The SI unit of angular momentum is given by:
a. J.s
b. J.s-2
c. J.m
d. J.s-1
62. Angular momentum of a rigid body is given by:
a. Fꞷ2
b. Fꞷ
c. Iꞷ2
d. Iꞷ
63. For angular momentum of system to remain constant, external torques should be:
a. Zero
b. Small
c. None
d. Large
64. The value of angular momentum is maximum when θ is
a. 45o
b. 90o
c. 0o
d. 60o
65. The angular momentum L is given by:
a. →r x →F
b. →r x →P
c. →F x →P
d. →L x →r
66. The product of rotational inertia “I” and angular velocity “ ” is equal to:
a. Angular momentum
b. Torque
c. Force
d. Linear momentum
67. The dimensions of angular momentum L are:
a. [ML2T-1]
b. [ML2T-1]
c. [ML-2]
d. [MLT-1]
68. In rotational motion, the torque is equal to rate of change of:
a. Angular momentum
b. Angular velocity
c. Angular momentum
d. Linear momentum
69. The SI unit of angular momentum is:
a. Kg2ms-1
b. Kg m2s-1
c. Kg ms-1
d. Kg m2s-2
70. The unit of rotational K.E is:
a. J
b. rad / sec
c. Kgm2
d. Js
71. The rotational kinetic energy of a solid sphere is:
a. 1/2 Iꞷ2
b. 2/5 mr2ꞷ2
c. 1/2 Iꞷ
d. 2/5mv2
72. The rotational K.E of a hoop of mass “m” moving down frictionless inclined plane with velocity “v” will be:
a. 3/4mv2
b. 1/4mv2
c. mv2
d. 1/2mv2
73. Speed of a hoop at the bottom of inclined plane is:
a. √4/3gh
b. √gh
c. √4gh
d. √2gh
74. The rotational K.E of a hoop of radius V is:
a. mr2ꞷ2
b. 1/4 mr2ꞷ2
c. 1/2 r2ꞷ2
d. 1/2 mr2ꞷ2
75. The ratio of moment of inertia of a disc and hoop is:
a. 1/2
b. 3/4
c. 1/4
d. 4/3