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Important Questions on Rotational Mechanics

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 83
A uniform thin rod of mass 'm' and length l is held horizontally by two vertical strings attached to the two ends. One of the string is cut. Find the angular acceleration soon after it is cut:
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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 84
A wheel having moment of inertia 2 kg m2 about its vertical axis, rotates at the rate of 60 rpm about this axis. The torque which can stop the wheel's rotation in one minute would be___
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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 85
A fan is moving around its axis. What will be its motion regarded as?
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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 86
A mass m hangs with the help of a string wrapped around a pulley on a frictionless bearing. The pulley has mass m and radius R. Assuming pulley to be a perfect uniform circular disc, the acceleration of the mass m, if the string does not slip on the pulley, is
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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 87
A rod can rotate about a fixed vertical axis, passing through one of its end. The mass is non-uniformly distributed along the length of the rod. A horizontal force of constant magnitude and always perpendicular to the rod is applied at the end. Which of the following quantity (after one rotation) will not depend on the information that through which end the axis passes? (Assuming initial angular velocity to be zero)
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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 88
A platform is revolving in a horizontal plane about a fixed axis and a boy is sitting at the center. The initial kinetic energy of the system is K. If the boy stretches his arms then a moment of inertia of the system becomes double. The final kinetic energy of the system is: 
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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 89
On account of melting of ice at the north pole, the moment of inertia of spinning earth,
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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 90
Two rigid bodies A and B rotate with rotational kinetic energies EA and EB respectively. The moments of inertia of A and B about the axis of rotation are IA and IB respectively. If IA=IB4 and EA=100EB the ratio of angular momentum LA of A to the angular momentum LB of B is