Question # 1

A stone is tied to the end of a 20 cm along string is whirled in a horizontal circle.

if centripetal acceleration is 9.8 m/sec², then its angular velocity in rad/sec is:

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22/7

7

14

21

Direction of motion ______ in circular motion:

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Changes off and on

Changes continuously

Does not change

None of them

The angular speed of a particle moving along a circular path is 5 Pie rad sec^-1, Its period of motion is:

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2.5 sec

0.06 sec

15.7 sec

0.4 sec

Centripetal acceleration is also called ________ acceleration

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Tangential

Radial

Angular

None of these

In case of planets, the necessary acceleration is provided by:

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Gravitational force

Coulomb force

Frictional force

None of these

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

A point on the rim of a wheel moves 0.2 m where the wheel turns through an angle is 14.3 degrees. The radius of the wheel is:

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0.05 m

0.08 m

0.8 m

0.008 m

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

______ 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

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

A rotating wheel accelerates up to the value of 0.75 rev/sec²after 2 seconds of its start. Its angular velocity becomes:

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9.42 rad/sec

2.6 rev/sec

1.5 rev/sec

Both A and C

Centripetal force performs:

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Maximum work

Negative work

Positive work

None of these

Direction of motion_______ in circular of motion:

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Changes off and on

Changes continuously

Does not change

None of them

Which of the following pairs does not have identical dimensions?

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Torque and energy

Energy and work

Momentum and impulse

Mass and moment of inertia

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

The useful unit of the angular displacement in SI unit is:

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Degree

Revolution

Radian

Metre

The instantaneous acceleration of a body moving with constant speed in a circle:

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Remains constant

Is called centripetal acceleration

Tangential acceleration

None of these

If a gymnast sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will

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Increase

Decrease

Remain constant

None of these

Moment of inertia depends upon:

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Mass

Selection of axis of rotation

Both of them

None of these

A body can have constant velocity when it follows:

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A circular path

A rectilinear path

Trajectory of a projectile

None of these

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

Angular velocity is a:

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Scalar quantity

Vector quantity

Complex quantity

None of these

If a gymnast is sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will:

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Increase

Decrease

Remains constant

None of these

A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be:

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49 rad/sec²

1 rad/sec²

0.16 rev/sec²

Both A and C

Both B and C

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:

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38 m/sec

3.8 m/sec

0.6 m/sec

None of these

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

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3

24

126

200

Angular velocity is a:

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Scalar quantity

Vector quantity

Complex quantity

None of these

Which one is related to angular motion:

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Moment of a force

Moment of inertia

Moment of momentum

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

Centripetal acceleration is also called _______ acceleration:

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Tangential

Radial

Angular

None of them

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