1) Rotational Dynamics(Physics)

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Test created by; Sayyad Hina 12th class JANVIKAS MAHAVIDYALAYA BANSAROLA Tq.Kaij Dist.Beed.

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When seen from below,the blades of a ceiling fan are seen to be revolving anticlockwise and their speed is decreasing.Select correct statement about the directions of its angular velocity and angular acceleration.

2 points

Angular velocity upwards, angular acceleration downwards

Angular velocity downwards, angular acceleration upwards

Both angular velocity and angular acceleration, upwards

Both angular velocity and angular acceleration downwards

Clear selection

The flywheel is so constructed that the entire mass of it is concentrated at its rim,because

2 points

It increases the power

It increases the speed

It increases the moment of inertia

It save the flywheel fan breakage

Clear selection

The uniform circular motion is acceleration motion,because

2 points

The motion acceleration due to the change in velocity

The motion acceleration due to the change in angular velocity

The motion acceleration due to the force

All of these

Clear selection

Moment of inertia of thin uniform rod about an axis passing through one end perpendicular to its length is I .Then moment of inertia of the same rod about the central axis perpendicular to its plane is

2 points

I/4

2 I

4 I

3 I

Clear selection

For which of the following does the centre of mass lie outside the body?

2 points

A pencil

A shotput

A dice

A bangle

Clear selection

A car is moving in a horizontal circular track of radius 10m with a constant speed 10m/s.If a bob is suspended from the roof of the car by light rigid rod of length 1m,then the angle made by the rod with the track will be(g=10m/s2

2 points

Zero

30°

45°

70°

Clear selection

A coin placed on a rotating table just slips when it is placed at a distance 4 r from the centre,on doubling the angular velocity of the table, the coin will just slip now the coin is at a distance from centre is

2 points

4 r

r/4

2 r

Clear selection

A body is moving along a circular path with constant speed.If the direction of rotation is reversed and the speed is doubled,

2 points

Direction of centripetal acceleration is reversed

Direction of centripetal acceleration is remains unchanged

Magnitude of centripetal acceleration is doubled

Magnitude of centripetal acceleration is halved

Clear selection

A chain of 100 links is 1 m long and has a mass of 2kg. With the ends fastened together it is set rotating at 3000rpm. Then centripetal force on each link is

2 points

3.14N

31.4N

314N

3140N

Clear selection

A coin is placed at a distance 9 cm from centre on a rotating turn table starts slip .If the angular velocity of the turn table is tripled,then the distance of the coin from the centre will be

2 points

9cm

3cm

1.5cm

1cm

Clear selection

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