11.  The dimensions of angular momentum are – (MHCET 2004) (a) [M^{1} L^{2} T^{}^{1}] (b) [M^{1} L^{1} T^{}^{1}] (c) [M^{1} L^{1} T^{}^{2}] (d) [M^{1} L^{2} T^{}^{2}] Answer: (a)

12.  A cylinder of mass 10 kg and radius 20 cm is free to rotate about its axis. It receives an angular impulse of 4 kg m^{2}/s. what is the angular speed of the cylinder if the cylinder is initially at rest? (a) 20 rad/s (b) 15 rad/s (c) 10 rad/s (d) 5 rad/s Answer: (a) 
13.  The moment of inertia of an electron in n^{th} orbit will be (MHTCET2001) (a) _{} (b) _{} (c) _{} (d) _{} Answer: (a) 
14.  The M.I. of a body does not depends upon (CPMT 75) (a) Angular velocity of a body (b) Axis of rotation of the body (c) The mass of the body (d) The distribution of the body Answer: (a) 
15.  What is the moment of inertia of a solid sphere of radius R and density r about its diameter? (a) _{} (b) _{} (c) _{} (d) _{} Answer: (c) 
16.  M.I. of a thin uniform rod about the axis passing through its centre and perpendicular to its length is ML^{2}/12. The rod is cut transversely into two halves, which are then riveted end to end. M.I. of the composite rod about the axis passing through its centre and perpendicular to its length will be (MHTCET2001) (a) _{} (b) _{} (c) _{} (d) _{} Answer: (b) 
17.  The radius of gyration of a disc of mass 100 gm and radius 5 cm about an axis passing through its centre of gravity and perpendicular to the plane is (MHTCET2000) (a) 0.5 cm (b) 2.5 cm (c) 3.54 cm (d) 6.54 cm Answer: (c) 
18.  A thin circular ring of mass M and radius r is rotating about its axis passing through its centre and perpendicular to its plane with a constant angular velocity w two objects each of mass m are attached gently to the opposite ends of a diameter of the ring. The ring will now rotate with an angular velocity of (I.I.T. 83) (a) _{} (b) _{} (c) _{} (d) _{} Answer: (b) 
19.  A solid cylinder of mass M and radius R rolls down an inclined plane without slipping. The speed of its centre of mass when it reaches the bottom is (EAMCET 85, PEN 85 MP) (a) _{} (b) _{} (c) _{} (d) _{} Answer: (b) 
20.  The position vector of a particle of mass 10 g, about the origin is _{}If it moves with a linear velocity of _{}m/s, then its angular momentum will be (a) _{} (b) _{} (c) _{} (d) _{} Answer: (c) 
21.  Moment of inertia depends upon the (MHCET 2002) (a) Mass of the body (b) Distribution of mass of the body (c) Position of axis of rotation (d) All of these Answer: (d) 