A particle of mass 5 g is moving with a uniform speed of 32cm/s in the x-y plane along the line y = 25cm. The magnitude of its angular momentum about the origin in g-cm2/s is

1.  0

2.  30

3.  302

4.  3010

Subtopic:  Angular Momentum |
 71%
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A mass m is supported by a massless string wound round a uniform cylinder of mass M and radius R. On releasing the mass from rest, it will fall with an acceleration assuming no slipping-

                       

1.  g3

2.  g2

3.  2g3

4.  g

Subtopic:  Torque |
 65%
From NCERT
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A closed tube partly filled with water lies in a horizontal plane. If the tube is rotated about perpendicular bisector, the moment of inertia of the system

1. increases

2. decreases

3. remains constant

4. depends on sense of rotation

Subtopic:  Moment of Inertia |
 62%
From NCERT
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A disc is rotating With an angular speed of m. If a child sits on it, which of the following is conserved? 

1.  kinetic energy 

2.  potential energy 

3.  linear momentum 

4.  angular momentum

Subtopic:  Angular Momentum |
 90%
From NCERT
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A particle moves in a force field given by F = r^ F r, where r is the unit vector along with the position vector r, then which is true? 

1.  The torque acting on the particle is not zero 

2.  The torque acting on the particle produces an angular acceleration in it 

3.  The angular momentum of the particle is conserved 

4.  The angular momentum of the particle increases.

Subtopic:  Angular Momentum |
 71%
From NCERT
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Four masses are fixed on a massless rod as shown in the figure. The moment of inertia about the axis P is about

                 

1.  2 kg-meter2

2.  1 kg-meter2

3.  0.5 kg-meter2

4.  0.3 kg-meter2

Subtopic:  Moment of Inertia |
 73%
From NCERT
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A circular plate of diameter d is kept in contact with a square plate of an edge as shown in the figure. The density of the material and the thickness are the same everywhere. The center of mass of the composite system will be

                    

1. inside the circular plate 
2. inside the square plate
3. at the point of contact 
4. outside the system
Subtopic:  Center of Mass |
 64%
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A small disc of radius 2 cm is cut from a disc of radius 6 cm. If the distance between their centres is 3.2 cm, what is the shift in the centre of mass of the disc?

1.  0.4 cm

2.  2.4 cm

3.  1.8 cm

4.  1.2 cm

Subtopic:  Center of Mass |
 63%
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From a circular disc of radius \(R\), a square is cut out with a radius as its diagonal. The distance of the centre of mass of the remainder from the centre of the disc is:
1. \(\frac{R}{(4\pi -2)}\)
2. \(\frac{R}{2\pi}\)
3. \(\frac{R}{(\pi -2)}\)
4. \(\frac{R}{(2\pi -2)}\)
Subtopic:  Center of Mass |
 58%
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A particle of mass m moves along line PC with velocity v as shown.  What is the angular momentum of the particle about P?

1. mvL                 

2. mvl               

3. mvr                 

4. zero

Subtopic:  Angular Momentum |
From NCERT
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