chap.5 Circular motion MCQs with solution
Circular motion
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1)
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1 revolution: a) 57° b) 90° c) 180° d) 360° |
D |
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2)
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One radian is equal to. a)
67.3° b) 57.3° c) 87.3° d) 60° |
B |
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3)
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The SI unit of angular momentum is Js. It can also be expressed as: a) 𝑘𝑔 𝑚 𝑠 −1 b) 𝑘𝑔 𝑚2 𝑠 −1 c) 𝑘𝑔 𝑚2
𝑠 −2 d) 𝑘𝑔 𝑚−2 𝑠 −1 |
B |
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4)
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The rate of change of angular
displacement is called: a)
Angular displacement b)
Angular velocity c)
Angular acceleration d) Torque |
B |
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5)
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Revolution/minute is the unit for a) Angular displacement b) Angular acceleration c) Angular velocity d) Time |
C |
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6)
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Time rate of change of angular velocity
is called: a) Angular momentum b) Angular displacement c) Angular acceleration d) None of these |
C |
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7)
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The angular acceleration is produced by: a)
Momentum b) Torque c) Pressure d) Power |
b |
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8)
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A particle is moving in a circle with constant
speed. The
direction of centripetal force will be: a)
Along the tangent b)
Along radius towards center c)
Along radius away from center d)
Changing with motion |
B |
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9)
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Moment of inertia is equal to: a) 𝑚2 𝑟 b) 𝑚2 𝑟 2 c) 𝑚 𝑟 d) 𝑚 𝑟 2 |
d |
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10) |
Moment of inertia is measured in: a) 𝑘𝑔 𝑚2 b) 𝑘𝑔 𝑚−2 c) 𝑁 𝑠 d) 𝑟𝑎𝑑/𝑠 |
a |
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11) |
The direction of linear velocity of body
moving in
a circle is. a)
Along the axis of rotation b)
Along the tangent c)
Directed towards the center d)
Directed away from the center |
D |
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12) |
The angular momentum is given by: a) mω b) ω × F c) r × F d) r × p |
B |
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13) |
When a body is whirled in a horizontal
circle by
means of a string the centripetal force is supplied by. a)
Mass of a body b) Velocity of
body c)
Tension in the string d) None of
these |
C |
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14) |
Centripetal force performs a)
Maximum work b) Minimum work c)
Negative work d) No work |
D |
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15) |
When a body moves in a circle of radius „r‟
with
linear speed „V‟, its centripetal force is. a)
mv / r2 b) mv / r c) mv2 / r d) mv2 / r2 |
C |
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16) |
The angular acceleration of a body is
directed a)
Towards the center of the circle b)
Away from the center of the circle c)
Along the tangent to the circle d)
Along the axis of rotation |
D |
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17) |
The magnitude of the centripetal force on
a mass m moving with angular speed 𝜔 in a
circle of
radius r is a) 𝑚𝑟2 𝜔 b) 𝑚𝑟2 /𝜔 c) 𝑚𝑟 𝜔 d) 𝑚𝑟 𝜔2 |
d |
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18) |
The dimension of angular acceleration is: a) 𝑇-1 b) 𝑇 – 2 c) 𝑇-3 d) 𝐿𝑇-2 |
B |
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19) |
A gymnast sitting on stool with his arms out
stretched
lowers his arms: a)
The angular speed decreases b)
The angular speed increases c)
Neither increases nor decrease d)
Both increases and decreases |
B |
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20) |
When torque acting on a system is zero,
which of
the following will be constant: a)
Linear momentum b) Force c)
Angular momentum d) Impulse |
C |
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21) |
The rotational K.E of any hoop of radius “r” is given by: a) c) |
A |
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22) |
Unit of angular velocity in SI unit is: a) 𝑅𝑎𝑑./𝑠 b) 𝑚/ c) 𝑑𝑒𝑔𝑟𝑒𝑒/𝑠 d)
𝑅𝑒𝑣𝑜𝑙𝑢𝑡𝑖𝑜𝑛/𝑠 |
A |
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23) |
Angular speed of daily rotation of earth is: a) 2𝜋 𝑟𝑎𝑑./𝑠 b) 𝜋 𝑟𝑎𝑑./𝑠 c) 4𝜋 𝑟𝑎𝑑./𝑠 d) 7.3 × 10-5 𝑟𝑎𝑑./𝑠 |
D |
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24) |
The rotational K.E of a body is given by: a) c) |
d |
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25) |
The minimum velocity necessary to put a
satellite
into orbit is: a) 7.1 𝑘𝑚 𝑠-1 b) 7.3 𝑘𝑚 𝑠-1 c) 7.9 𝑘𝑚 𝑠-1 d) 8.9 𝑘𝑚 𝑠-1 |
C |
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26) |
The apparent weight of a man in an
ascending
lift moving with acceleration “a”: a)
Increases b) Decreases c)
Remains constant d) Becomes zero |
A |
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27) |
The apparent weight of a man in a lift moving down with an acceleration of
9.8 𝑚 𝑠 −2 is: a)
Zero b) 9.8 N c)
19.6 N d) Infinity |
a |
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28) |
Which electromagnetic wave are used as
medium in
satellite communication system: a)
Microwaves b) Radio waves c)
Infrared waves d) Ultraviolet
waves |
A |
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29) |
The minimum number of communication
satellites required to cover the whole
earth is: a) 4 b) 3 c) 2 d) 5 |
C |
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30) |
The critical speed of an artificial satellite
is. a) 6
𝑘𝑚 𝑠-1 b) 8.1 𝑘𝑚 𝑠-1 c)
7.9 𝑘𝑚 𝑠-1 d) 8 𝑚 𝑠-1 |
C |
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31) |
Geo-stationary satellite completes one rotation around earth in. a) 3
hours b) 6 hours c)
12 hours d) 24 hours |
D |
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