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Online Tests
ECAT Pre General Science Physics Chapter 5 Circular Motion Online Test MCQs With Answers
Question # 1
If a gymnast is sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will:
Choose an answer
Increase
Decrease
Remains constant
None of these
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Question # 2
Centripetal force performs:
Choose an answer
Maximum work
Negative work
Positive work
None of these
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Question # 3
Conventional the angular Velocity is Directed at an angle of:
Choose an answer
90
° to the axis of rotation
30
° to the axis of rotation
0
° to the axis of rotation
None of above
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Question # 4
A disc rolls down a hill and its speed at bottom is found to be 11.4 m/sec. Height of the hill is then nearly:
Choose an answer
10 m
12 m
13 m
15 m
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Question # 5
Direction of motion _________ in circular motion
Choose an answer
Changes off and on
Changes continously
Does not change
None of them
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Question # 6
A body can have constant velocity when it follows:
Choose an answer
A circular path
A rectilinear path
Trajectory of a projectile
None of these
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Question # 7
Einstein's theory about gravity if better than Newton's because it gave explanation of:
Choose an answer
Inverse square law
Bending of light
Both A and B
None of above
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Question # 8
A 1000 Kg car travelling with a speed of 90 km/hr turns around a curve of radius 0.1 km. The necessary centripetal force comes out to be:
Choose an answer
8.1 X 10
7
N
625 N
6250 N
None of these
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Question # 9
Centripetal acceleration is also called ______ acceleration:
Choose an answer
Tangential
Radial
Angular
None of them
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Question # 10
Direction of motion _______ in circular motion
Choose an answer
Changes off and on
Changes continuously
Does not change
None of them
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Question # 11
The angular speed of a particle moving along a circular path is 5 Pie rad sec
-1
, Its period of motion is:
Choose an answer
2.5 sec
0.06 sec
15.7 sec
0.4 sec
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Question # 12
The useful unit of angular replacement in SI unit is:
Choose an answer
Degree
Revolution
Radian
Metre
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Question # 13
A toy car moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed V of the car is:
Choose an answer
38 m/sec
3.8 m/sec
0.6 m/sec
None of these
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Question # 14
INTELSAT operates at frequencies 4, 6, 11, 14 having unit of:
Choose an answer
KHz
MHz
GHz
BHz
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Question # 15
An axis of rotation
Choose an answer
Is a straight line
Is normal to the plane of rotation
Passes through pivot point O
All of them
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Question # 16
The number of "Earth Stations" which transmit signals to satellites and receive signals fro them are
Choose an answer
3
24
126
200
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Question # 17
When a body moves along a circular path with constant speed, it has an acceleration, which is always directed
Choose an answer
Along the tangent
Towards the centre
Away from the centre
None of them
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Question # 18
Centripetal acceleration is also called ______ acceleration
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Tangential
Radial
Angular
None of them
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Question # 19
A body moving along the circumference of a circle of radius R completes one revolution. The radius of the covered path to the angle subtended at the center is:
Choose an answer
Radius of the circle
Twice the radius
Thrice the radius
None of these
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Question # 20
Satellites are held in orbits around Earth by its:
Choose an answer
Gravitational field
Magnetic field
Own orbital motion
Own spin motion
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Question # 21
Conventionally the angular velocity is directed at an angle of
Choose an answer
90° to the axis of rotation
30° to the axis of rotation
0° to the axis of rotation
None of the above
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Question # 22
A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is
Choose an answer
0.05 m
0.08 cm
0.8 m
0.008 m
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Question # 23
Angular velocity is a:
Choose an answer
Scalar quantity
Vector quantity
Complex quantity
None of these
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Question # 24
Centripetal acceleration is also called ________ acceleration
Choose an answer
Tangential
Radial
Angular
None of these
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Question # 25
Direction of motion ______ in circular motion:
Choose an answer
Changes off and on
Changes continuously
Does not change
None of them
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Question # 26
Angular momentum is a:
Choose an answer
vector quantity
Imaginary quantity
Complex Quantity
Scalar Quantity
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Question # 27
The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 9.8 m sec
-2
comes out to be
Choose an answer
980 N
580 N
1380 N
Zero
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Question # 28
Moment of inertia depends upon:
Choose an answer
Mass
Selection of axis of rotation
Both of them
None of these
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Question # 29
Circular motion is an example of motion in:
Choose an answer
One dimension
Two dimensions
Three dimensions
None of these
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Question # 30
The center of mass of a sphere lies at:
Choose an answer
The axis of the sphere
Circumference of sphere
Center of the sphere
None of them
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