Two racing cars of masses \(m_1\) and \(m_2\) are moving in circles of radii \(r_1\) and \(r_2\) respectively. Their speeds are such that each makes a complete circle in the same duration of time \(t\). The ratio of the angular speed of the first to the second car is:

1. \(m_1:m_2\) 2. \(r_1:r_2\)
3. \(1:1\) 4. \(m_1r_1:m_2r_2\)

Subtopic:  Circular Motion |
 74%
From NCERT
PMT - 1999
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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 |
 64%
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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A particle moves with constant angular velocity in a circle. During the motion its:

1. Energy is conserved
2. Momentum is conserved
3. Energy and momentum both are conserved
4. None of the above is conserved

Subtopic:  Circular Motion |
From NCERT
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Two bodies of mass 10 kg and 5 kg moving in concentric orbits of radii R and r such that their periods are the same. Then the ratio between their centripetal acceleration is 

(1) R/r

(2) r/R

(3) R2/r2

(4) r2/R2

Subtopic:  Circular Motion |
 62%
From NCERT
PMT - 2001
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A particle is moving in a horizontal circle with constant speed. It has constant 

(1) Velocity

(2) Acceleration

(3) Kinetic energy

(4) Displacement

Subtopic:  Circular Motion |
 70%
From NCERT
PMT - 1987
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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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