Multiple Choice Questions Chapter 5 Rotational and Circular Motion l 1st Year Physics Federal Board

Choose the best possible answer The angular speed in radians/hours for daily rotation of our earth is? A.2π B. 4π C. π/6 D. π/12 Linear acceleration A. 0o B. 180o C. 360o D. 90o What is moment of inertia of a sphere A. MR^R B. 1/2 MR^R C. 2/5 MR^R D. 1/2 M^R R A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of particle. The motion of the particle takes place in a horizontal plane. It follows A. Linear momentum is constant B. Velocity is constant C. It moves in a circular path D. particle move in straight line A body moving in a circular path with constant speed has A. Constant acceleration B. Constant retardation C. Variable acceleration D. Variable speed and constant velocity Astronauts appear weightless in space because A. there is no gravity in space B. there is no floor pushing upwards on the C. satellite is freely falling D. there is no air in space Which one is constant for a satellite in orbit? A. Velocity B. K.E C. Angular Momentum D. Potential Energy If the earth suddenly stops rotating the value of 'g' at equator would: A. Decrease B. Remain unchanged C. Increase D. Become Zero If solid sphere and solid cylinder of same mass and density rotate about their own axis, the moment of inertia will be greater for A. Solid sphere B. Solid cylinder C. The one that has the largest mass arrives first D. The one that has the largest radius arrives first The gravitational force exerted on an astronaut on Earth’s surface is 650N down. When she is in the international space station, the gravitational force on her is A. larger B. Exactly the same C. Smaller D. Nearly but not exactly zero E. Exactly zero A solid cylinder of mass M and radius R rolls down an incline without slipping. Its moment of inertia about an axis through its centre of mass is MR2/2. At any instant while in motion, its rotational kinetic energy about its center of mass is what fraction of its total kinetic energy? A. ½ B. ¼ C. 1/8 D. 2/5