If a gymnast, sitting on a rotating stool, with his arms outstretched, suddenly lowers his hands

1.  the angular velocity increases

2.  his moment of inertia increases

3.  the angular velocity stays constant

4.  the angular momentum increases

Subtopic:  Angular Momentum |
 75%
From NCERT
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Moment of inertia of a uniform circular disc about a diameter is I. Its moment of inertia about an axis perpendicular to its plane and passing through a point on its rim will be

1.  5 I

2.  3 I

3.  6 I

4.  4 I

Subtopic:  Moment of Inertia |
 58%
From NCERT
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A disc and a solid sphere of the same radius but different masses roll off on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first?

1.  Disk

2.   Sphere

3.  Both reach at the same time

4.  Depends on their masses

Subtopic:  Rolling Motion (OLD NCERT) |
 70%
From NCERT
NEET - 2016
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The rotational KE of a body is E and its moment of inertia is I. The angular momentum is 

1.  EI

2.  2EI

3.  2 EI

4.  EI

Subtopic:  Angular Momentum |
 88%
From NCERT
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A particle of mass m moves in the XY plane with a velocity of V along the straight line AB. If the angular momentum of the particle about the origin O is Lwhen it is at A and Lwhen it is at B, then:

                 

1. \(\mathrm{L}_{\mathrm{A}}>\mathrm{L}_{\mathrm{B}}\)
2. \(\mathrm{L}_{\mathrm{A}}=\mathrm{L}_{\mathrm{B}}\)
3. The relationship between \(\mathrm{L}_{\mathrm{A}} \text { and } \mathrm{L}_{\mathrm{B}}\) depends upon the slope of the line AB
4. \(\mathrm{L}_{\mathrm{A}}<\mathrm{L}_{\mathrm{B}}\)

Subtopic:  Angular Momentum |
 65%
From NCERT
AIIMS - 2007
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If rotational kinetic energy is 50 % of translational kinetic energy, then the body is 

1. Ring

2. Cylinder

3. Hollow sphere

4. Solid sphere

Subtopic:  Moment of Inertia | Rolling Motion (OLD NCERT) |
 60%
From NCERT
PMT - 2003
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Consider a system of two identical particles. One of the particles is at rest and the other has an acceleration a. The centre of mass has an acceleration

1. zero

2. \(\frac{a}{2}\)

3. a

4. 2a

Subtopic:  Center of Mass |
 77%
From NCERT
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A solid sphere rolls without slipping down a 30° inclined plane. If g = 10 m/s2, the acceleration of the rolling sphere is

1.  5 ms-2

2.  725ms-2

3.  257ms-2

4.  157ms-2

Subtopic:  Rolling Motion (OLD NCERT) |
 86%
From NCERT
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If the equation for the displacement of a particle moving on a circular path is given by θ=2t3+0.5, where θ is in radian and t is in second, then the angular velocity of the particle after 2s is 

1. 8 rad/s

2. 12 rad/s

3. 24 rad /s

4. 36 rad/s

Subtopic:  Rotational Motion: Kinematics |
 85%
From NCERT
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A pan containing a layer of uniform thickness of ice is placed on a circular turntable with its centre coinciding with the centre of the turn table. The turntable is now rotated at a constant angular velocity about a vertical axis passing through its centre and then driving is withdrawn. There is no friction between the table. As the ice melts

1.  the angular velocity of the system decreases

2.  the angular velocity of the system increases

3.  the angular velocity of the system remains unchanged

4.  the moment of inertia of the system decreases

Subtopic:  Angular Momentum |
 58%
From NCERT
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