What determines the nature of the path followed by the particle?

1. Speed only

2. Velocity only

3. Acceleration only

4. None of these

Subtopic:  Projectile Motion |
From NCERT
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A boat is sent across a river in perpendicular direction with a velocity of 8 km/hr. If the resultant velocity of boat is 10 km/hr, then velocity of the river is : 

1. 10 km/hr

2. 8 km/hr

3. 6 km/hr

4. 4 km/hr

Subtopic:  Relative Motion |
 85%
From NCERT
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A boat moves with a speed of 5 km/h relative to water in a river flowing with a speed of 3 km/h and having a width of 1 km. The minimum time taken around a round trip(returning to the initial point) is:

1. 5 min

2. 60 min

3. 20 min

4. 30 min

Subtopic:  Relative Motion |
 54%
From NCERT
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A river is flowing from W to E with a speed of 5 m/min. A man can swim in still water with a velocity 10 m/min. In which direction should the man swim so as to take the shortest possible path to go to the south. 

1. 30° with downstream

2. 60° with downstream

3. 120° with downstream

4. South

Subtopic:  Relative Motion |
 54%
From NCERT
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If a particle moves in a circle describing equal angles in equal times, its velocity vector:

1. remains constant.

2. changes in magnitude.

3. changes in direction.

4. changes both in magnitude and direction.

Subtopic:  Circular Motion |
 74%
From NCERT
PMT - 1972
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A motorcyclist going round in a circular track at a constant speed has:

1. constant linear velocity.

2. constant acceleration.

3. constant angular velocity.

4. constant force.

Subtopic:  Circular Motion |
 65%
From NCERT
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A particle P is moving in a circle of radius ‘a’ with a uniform speed v. C is the centre of the circle and AB is a diameter. When passing through B the angular velocity of P about A and C are in the ratio 

1. 1 : 1

2. 1 : 2

3. 2 : 1

4. 4 : 1

Subtopic:  Circular Motion |
From NCERT
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The angular speed of a flywheel making 120 revolutions/minute is: 

1. 2π  rad/s

2. 4π2  rad/s

3. π  rad/s

4. 4π  rad/s

Subtopic:  Circular Motion |
 78%
From NCERT
PMT - 1995
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Certain neutron stars are believed to be rotating at about 1 rev/sec. If such a star has a radius of 20 km, the acceleration of an object on the equator of the star will be 

1. 20×108m/sec2

2. 8×105m/sec2

3. 120×105m/sec2

4. 4×108m/sec2

Subtopic:  Circular Motion |
 70%
From NCERT
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An electric fan has blades of length 30 cm as measured from the axis of rotation. If the fan is rotating at 1200 r.p.m, the acceleration of a point on the tip of the blade is about

1. 1600 m/sec2

2. 4740 m/sec2

3. 2370 m/sec2

4. 5055 m/sec2

Subtopic:  Circular Motion |
 75%
From NCERT
PMT - 1990
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