Question # 1

A particle is moving with constant speed by keeping itself at constant distance from a fixed point in a given plane. Its motion is

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Circular motion

Uniform circular motion

Uniform circular motion with fixed axis of rotation

Uniform circular motion with axis of rotation not defined

If the radius of the circular path of particle going around the circle is doubled without changing its frequency of rotation, then centripetal force on it is.

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doubled

halved

unchanged

quadrupled

A body of mass m tied to a string is moved in a vertical circle of radius r. the difference in tensions at the lowest point and the highest point is.

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2 mg

4 mg

6 𝑚g

8 mg

Torque is necessary for producing.

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angular speed

linear acceleration

angular acceleration

none of these

What happens to the centripetal acceleration of a particle, when its speed is doubled and angular velocity is halved?

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halved

doubled

remain unchanged

becomes four times

For a body moving with constant speed in a horizontal circle, which of the following remains constant?

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Velocity

Centripetal force

Acceleration

Kinetic energy

For a particle moving in uniform circular motion

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Velocity is transverse and acceleration is radical

Velocity is radial and acceleration is transverse

Both velocity and acceleration are radial

Both velocity and acceleration are transverse

The time period of revolution of geostationary satellite is

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1440 minutes

24 minutes

84 minutes

none of these

A body crosses the topmost point of a vertical circle with critical speed. Itscentripetal acceleration, when the string is horizontal will be

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4g

3g

g

6g

A body moving in a circular path with a constant speed has a

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Constant velocity

Constant kinetic energy

Constant acceleration

Constant displacement

The ratio of the SI unit to the C)G.S unit of torque is.

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10⁷

10⁹

10⁰

10³

The angular analogue of linear displacement is called

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angular velocity

angular displacement

angular momentum

moment of force

A body revolved around the sun 27 times faster then the earth what is the ratioof their radii

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1/27

1/4

1/9

1/3

The force which can do no work on the body on which it acts:

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Frictional force

Elastic force

Gravitational force

Centripetal force

A car of 1000kg traveling at 20m/sec rounds a curve of radius 100m. Find the necessary centripetal force

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4 x 10³ kg m/s²

3 x 10³ kg m/s²

5 x 10³kg m/s²

4.5 x 10³kg m/s²

The work done to keep the satellite in the given orbit is.

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Zero

infinity

unit

can’t be decided

When a particle moves in a uniform circular motion. It has:

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Radial velocity and radial acceleration

Tangential velocity and radial acceleration

Tangential velocity and tangential acceleration

Radial velocity and tangential acceleration

The mud flies off the tyre of a fast moving car in the direction

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parallel to the moving tyre

anti parallel to the moving tyre

tangent to the moving tyre

none of these

A couple produces

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linear motion

rotational motion

both (A) and (B)

None

The angular momentum changes form 2 units to 6 units in 4s. the torque is

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1 unit

3/2unit

1/2unit

4unit

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