Rotational Dynamics MCQs. We covered all the Rotational Dynamics MCQs in this post for free so that you can practice well for the exam.
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MCQ on Rotational Dynamics for Students
Analogue of mass in rotational motion is
(a) moment of inertia
(b) angular momentum
(c) gyration
(d) None of these
Option a – moment of inertia
The moment of inertia does not depend upon
(a) angular velocity of the body
(b) shape and size
(c) mass
(d) position of the axis of rotation
Option a – angular velocity of the body
During a summersault, a swimmer bends his body to
(a) increase the moment of Inertia
(b) decrease the moment of Inertia
(c) decrease the angular momentum
(d) reduce the angular velocity
Option b – decrease the moment of Inertia
Of the two eggs which have identical sizes, shapes and weights, one is raw, and the other is half-boiled. The ratio between the moment of inertia of the raw to the half-boiled egg about a central axis is
(a) one
(b) greater than one
(c) less than one
(d) not comparable
Option b – greater than one
A mass is resolving in a circle which is in the plane of the paper. The direction of angular acceleration is
(a) upward the radius
(b) towards the radius
(c) tangential
(d) at a right angle to angular velocity
Option a – upward the radius
A solid sphere is rotating in free space. If the radius of the sphere is increased keeping the mass same which one of the following will not be affected?
(a) Angular velocity
(b) Angular momentum
(c) Moment of inertia
(d) Rotational kinetic energy
Option b – Angular momentum
Angular momentum is
(a) the moment of momentum
(b) the product of mass and angular velocity
(c) the product of M.I. and velocity
(d) the moment of angular motion
Option a – the moment of momentum
The angular momentum of a system of particles is conserved
(a) when no external force acts upon the system
(b) when no external torque acts upon the system
(c) when no external impulse acts upon the system
(d) when the axis of the rotation remains the same
Option b – when no external torque acts upon the system
A couple is acting on two-particle systems. The resultant motion will be
(a) purely rotational motion
(b) purely linear motion
(c) both a and b
(d) None of these
Option a – purely rotational motion
The angular momentum of a system of particles changes, when
(a) the force acts on a body
(b) torque acts on a body
(c) the direction of velocity changes
(d) None of these
Option b – torque acts on a body
A body rolls down an inclined plane. If its K.E. of rotational motion is 40% of its K.E. of translational, then the body is a
(a) cylinder
(b) ring
(c) solid disc
(d) solid sphere
Option d – solid sphere
The relation between torque and angular momentum is similar to the relation between
(a) energy and displacement
(b) acceleration and velocity
(c) mass and moment of inertia
(d) force and linear momentum
Option d – force and linear momentum
For which one of the following does the centre of mass lie outside the body?
(a) A fountain pen
(b) A cricket ball
(c) A ring
(d) A book
Option c – A ring
A ring of mass m and radius r is melted and then moulded into a sphere. The moment of inertia of the sphere will be
(a) more than that of the ring
(b) less than that of the ring
(c) equal to that of the ring
(d) None of these
Option b – less than that of the ring
One solid sphere and disc of the same radius are falling along an inclined plane without slipping. One reaches earlier than the other due to
(a) the different radii of gyration
(b) different sizes
(c) different friction
(d) different moments of inertia
Option a – the different radii of gyration
A solid sphere, disc and solid cylinder all of the same mass and made of the same material are allowed to roll down (from rest) on an inclined plane, then
(a) the solid sphere reaches the bottom first
(b) the solid sphere reaches the bottom last
(c) the disc will reach the bottom first
(d) all reach the bottom at the same time
Option a – the solid sphere reaches the bottom first
When a mass is rotating in a plane about a fixed point, its angular momentum is directed along the
(a) radius of orbit
(b) tangent to the orbit
(c) line parallel to the plane of rotation
(d) a line perpendicular to the plane of rotation
Option d – a line perpendicular to the plane of rotation
A body cannot roll without slipping on an ( Rotational Dynamics MCQs )
(a) rough horizontal surface
(b) smooth horizontal surface
(c) rough inclined surface
(d) smooth inclined surface
Option d – smooth inclined surface
When a body starts to roll on an inclined plane, its potential energy is converted into
(a) translation kinetic energy only
(b) translation and rotational kinetic energy
(c) rotational energy only
(d) None of these
Option b – translation and rotational kinetic energy
If a running boy jumps on a rotating table, which of the following is conserved?
(a) Linear momentum
(b) Kinetic energy
(c) Angular momentum
(d) None of these
Option c – Angular momentum
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