Previous year papers of Physics exam questions - 1

Centre of mass of two body system divides the distance between two bodies, is proportional to (MH-CET 2004)
(a) Inverse of square of the mass
(b) Inverse of mass
(c) The ratio of the square of mass
(d) The ratio of mass
Answer: (b)
A thin circular ring of mass M and radius R is rotating about an axis passing through its centre and perpendicular to its plane with a constant angular velocity w1. Two small bodies each of mass m are attached gently to the opposite ends of a diameter of ring. The new angular velocity w2 of the ring will be
(a) (b)
(c) (d)
Answer: (b)
A solid sphere, a hollow sphere and a disc are released from the top of a frictionless inclined plane so that they slide down the inclined plane (without rolling). The maximum acceleration down the plane is
(a) For the solid sphere
(b) For the hollow sphere
(c) For the disc
(d) The same for all bodies
Answer: (d)
The kinetic energy of a body is 4 joule and its moment of inertia is 2 kg m2 then angular momentum is
(a) 4 kg m2/sec (b) 5 kg m2 /sec
(c) 6 kg m2/sec (d) 7 kg m2/sec
Answer: (a)
Moment of inertia depends on (MHT-CET-2002)
(a) Distribution of particles
(b) Mass
(c) Position of axis of rotation
(d) All of these
Answer: (d)
A disc of moment of inertia 9.8/p2 kg m2 is rotating at 600 rpm. If the frequency of rotation charges from 600 rpm to 300 rpm, then what is the work done?
(a) 1470 J (b) 1452 J
(c) 1567 J (d) 1632 J
Answer: (a)
A disc of mass 2 kg and diameter 2m is performing rotational motion. Find the work done, if the disc is rotating from 300 rpm to 600 rpm. (MH-CET 2004)
(a) 1479 J (b) 14.79 J
(c) 147.9 J (d) 1.479
Answer: (a)
What will be distance of centre of mass of the disc (see fig.) from its geometrical centre? (MHT-CET-2001)
(a) (b) R + r, to left
(c) (d)
Answer: (a)
The moment of inertia of uniform circular disc about an axis passing its centre is 6kgm2. its M.I. about an axis perpendicular to its plane and just touching the rim will be
(a) 18 kg m2 (b) 30 kg m2
(c) 15 kg m2 (d) 3 kg m2
Answer: (a)
A spherical ball rolls on a table without slipping. Then the fraction of its total energy associated with rotation is (PMT, 87 MP)
(a) (b)
(c) (d)
Answer: (b)