Question # 1

The artificial satellites are held in orbits by

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Gravitational force

Electric force

Magnetic force

All of these

When a body moves in circular motion, the angle between linear and angular velocity is.

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180^o

90^o

60^o

75.3^o

The rate of change of angular velocity is called

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Angular velocity

Angular acceleration

Angular displacement

Angular speed

Which quantity of the following is dimensionless.

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Angular velocity

Centripetal force

Angular acceleration

Angular displacement

Apparent weight of a man is in upward accelerated lift will

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Increases

Decreases

Remain same

Increases then decrees

The minimum number of correctly positioned communication satellites to cover whole populated earth is.

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2

3

100

200

When a body is moving along a circular path, then such a motion is called

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Vibratory motion

Rotatory motion

Linear motion

None of these

Time rate of change of angular displacement is called

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Linear velocity

Angular velocity

Rotational velocity

Vibrational velocity

As we go from pole to equator of earth, the value of 'g'

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Increase

Decrease

Remain constant

Zero

Which one of the following is into directed along the axis of rotation

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Angular acceleration

Angular momentum

Centripetal acceleration

Angular displacement

The maximum velocity necessary to put a satellite into orbit is

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7.1 kms-1

7.3 kms-1

7.9 kms-1

8,9 kms-1

The formula of centripetal acceleration is

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The work done by centripetal force is

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(-)ve

(+)ve

Maximum

Zero

Moment of inertia is measure din

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Kg m2

Kg m-2

Rad s-1

Joule second

The diver spin faster when moment of inertia becomes.

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smaller

Greater

Constant

Equal

Angular velocity determines, How fast or, How slow a body is

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Accelerating

Vibrating

Rotating

Oscillating

The direction of angular velocity is determined.

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Left hands rule

Head to tail rule

Right hand rule

General rule

The centripetal force is always directed

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Away from the centre along the radius

Along the direction of motion

Opposite to the motion of the body

Towards the centre along the radius

The moment of inertia is analogue to

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Mass

Weight

Torque

Force

A wheel of radius 50 cm having an angular speed of a rad /s have linear speed.

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1.5 m/s

3.5 m/s

2.5 m/s

4.5 m/s

Satellites are the objects that orbit around the

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Moon

Sun

Earth

Star

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