Question # 1

______ plays the same role during angular motion as played by the mass in linear motion

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Torque

Angular Momentum

Moment of a force

Moment of inertia

Radian is defined as the angle subtended at the center of a circle by an arc of:

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Length equal to its diameter

Length equal to its radius

Any length

None of these

When a body moves with a constant speed in a circle:

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No work is done on it

No acceleration is produced in the body

Velocity remains constant

None of these

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

A car is moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed v of the car is:

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38 m/sec

3.8 m/sec

0.6 m/sec

None of these

The rear wheels of an automobile are rotating with an angular velocity of 14 rev/sec which is reduced to 38 rad/sec in 5 second when brakes are applied. Its angular acceleration is:

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5 rad/sec²

-10 rev/sec²

-10 rad/sec²

-5 rev/sec²

A stone tied to the end of a 20 cm long string is whirled in a horizontal circle. If centripetal acceleration is 9.8 m/sec², then its angular velocity is rad/sec is:

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22/7

7

14

21

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:

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10 m

12 m

13 m

15 m

Conventional the angular Velocity is Directed at an angle of:

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of above

INTELSAT operates at frequencies 4, 6, 11, 14 having unit of:

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KHz

MHz

GHz

BHz

When body moves along a circular path with constant speed, it has an acceleration, which is always directed;

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Along the tangent

Towards the centre

Away from the centre

None of them

Conventionally the angular velocity is directed to an angle of:

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of the above

Direction of motion _________ in circular motion

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Changes off and on

Changes continously

Does not change

None of them

A car is turning around a corner at 10 m/sec as it travels along an arc of a circle. If value of centripetal acceleration is 10 m/sec²in this case, find radius of the circular path:

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1 m

5 m

10 m

15 m

The number of "Earth stations" which transmit signals to satellites and receive signals from them are:

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3

24

126

200

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