Here find good conceptual questions on Rotational Mechanics. Rotational mechanics questions can be bit tricky so you need to attempt them carefully.<\/p>\n\n\n\n
Question (1) <\/strong>If the total external force acting on a rigid body is zero, then Question (2)<\/strong> A ball of mass M is tied to a string of length L is whirled round in a horizontal plane in a circle of radius R. The speed of the stone is increased beyond the maximum permissible value and the string breaks suddenly; then Question (3)<\/strong> Which of the following statements is false Question (4)<\/strong> For a particle rotating about a fixed axis with non-uniform angular velocity, there Question (5)<\/strong> The moment of inertia plays the same role in rotational motion as is played in linear motion by Question (6)<\/strong> The trajectory of a \u2018fixed\u2019 point on the rim of a wheel of a vehicle as the vehicle moves with a constant speed is being observed by an observer fixed on ground. The trajectory, as noted by him will be Question (7)<\/strong> A jet engine works on the principle of conservation of Question (8)<\/strong> . A rectangular container half full of\u00a0oil \u00a0is being carried by a train on a horizontal track. If the train accelerates, the surface of the\u00a0oil in the container with respect to horizontal surface will Question (10)<\/strong> Of the two spheres of same size, mass and appearance one is hollow and other is solid. If the two are rolled down an inclined plane simultaneously, then Question (11)<\/strong> A shell fired from a gun at an angle to the horizontal explodes in mid air. The center of mass of the shell fragments will have Question (12)<\/strong> If a particle moves in the x – y plane, its angular momentum Question (13)<\/strong> At a given moment, the total angular momentum of a system of two particles about a certain point is zero. Accordingly we know that the particles Question (14)<\/strong> A particle of mass m and speed v has zero angular momentum with respect to a point\u00a0Z in space. We know that the particle Question (15)<\/strong> Two initially stationary skaters, of unequal mass( M ,m and M > m)\u00a0face each other on a frictionless horizontal ice surface. If they push apart, which one of the following statements is true? Question (16)<\/strong>. If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame , one can surely say that Question (17)<\/strong>. Angular momentum of a single particle moving along with constant speed along circular path Question (18)<\/strong>. A particle is confined to rotate in a circular path decreasing linear speed, then which of the following is correct?<\/p>\n\n\n\n (a) Angular Momentum is conserved Question (19).<\/strong> A particle undergoes uniform circular motion. About which point on the plane of the circle, will the angular momentum of the particle remain conserved?<\/p>\n\n\n\n (a) Center of the circle Question (20).<\/strong> A cylinder rolls up an inclined plane ,reaches some height and then rolls down (without slipping throughout these motions). The directions of frictional force acting on the cylinder Answers<\/strong><\/p>\n\n\n\n 1. a <\/p>\n","protected":false},"excerpt":{"rendered":" 1) If the total external force acting on a rigid body is zero, then 2) A ball of mass M is tied to a string of length L is whirled round in a horizontal plane in a circle of radius R. The speed of the stone is increased beyond the maximum permissible value and the string breaks suddenly; then
(a) only linear momentum remains constant
(b) only angular momentum remains constant
(c) both linear momentum and angular momentum remains constant
(d) neither linear momentum nor angular momentum remain constant<\/p>\n\n\n\n
(a) the stone will jerk radially outwards
(b) the stone will jerk radially inwards
(c) the stone will fly off tangentially from the instant the string breaks
(d) None of the above<\/p>\n\n\n\n
(a) During rolling the force of friction acts in the same direction as the direction of motion of the center of mass of the body
(b) The instantaneous speed of the point of contact during rolling is zero
(c) The instantaneous acceleration of the point of contact during rolling is zero
(d) For perfect rolling, work done against friction is zero<\/p>\n\n\n\n
(a) is only radial acceleration
(b) is only tangential acceleration
(c) is neither radial nor tangential acceleration
(d) are both radial acceleration and tangential acceleration
<\/p>\n\n\n\n
(a) velocity
(b) momentum
(c) energy
(d) mass
<\/p>\n\n\n\n
(a) a circle coinciding with circumference of the wheel repeating itself
(b) a parabola with vertex at the highest point on the wheel
(c) a straight line parallel to road
(d) a cycloid, repeating itself with every rotation of the wheel<\/p>\n\n\n\n
(a) mass
(b) energy
(c) linear momentum
(d) Angular momentum
(e) None of the above
<\/p>\n\n\n\n
(a) be raised upward from the front
(b) be raised in the middle
(c) be raised upward from the back
(d) remain unchanged
(e) Not sufficient information<\/p>\n\n\n\n
Question (9)<\/strong> The center of mass of a system of two particles is
(a) on the line joining then and midway between them
(b) on the line joining them at a point whose distance from each particle is proportional to the square of the mass of the particle
(c) on the line joining them and at a point whose distance from each particle is proportional inversely to the mass of that particle
(d) on the line joining them and at a point whose distance from each particle is proportional to the mass of that particle
<\/p>\n\n\n\n
(a) hollow sphere will reach the bottom first
(b) solid sphere will reach the bottom first
(c) both will reach bottom together
(d) either can reach first depending upon the surface of the plane
<\/p>\n\n\n\n
(a) vertically down
(b) horizontally
(c) along the same parabolic path of the unexploded shell
(d) along the tangent to the parabolic path of unexploded shell<\/p>\n\n\n\n
vector is in the
(a) x -direction
(b) z- direction
(c) y -direction
(d) x-y direction<\/p>\n\n\n\n
(a) must both be at rest.
(b) must be moving on the same circle in opposite directions.
(c) must be moving on straight perpendicular paths.
(d) must have the same magnitude linear momentum.
(e) None of the above statements are correct<\/p>\n\n\n\n
(a) will never pass through Z
(b) is moving along a line that is perpendicular to the plane containing it and Z
(c) is moving along a line that passes through Z
(d) must have already passed through point Z
(e) Not sufficient information<\/p>\n\n\n\n
(a) The skater (M) experiences twice the magnitude force experienced by the skater(m).
(b) The skater(m) \u00a0experiences twice the magnitude impulse experienced by the skater(M)
(c) After separation, both skaters have the same speed.
(d) After separation, both skaters have the same kinetic energy.
(e) After separation, both skaters have momentum of equal magnitude but in opposite directions.<\/p>\n\n\n\n
(a) Linear momentum of the system does not change in time
(b) KE of the system does not change in time
(c) Angular momentum of the system does not change with time
(d)Angular Momentum of the system does not change in time<\/p>\n\n\n\n
(a)changes in magnitude but remains same in the direction
(b) Remain same in magnitude and direction
(c) remain same in magnitude but changes in direction
(d) is zero<\/p>\n\n\n\n
(b) Its spiral towards the center
(c) Its acceleration is towards the center
(d)Only direction of the angular momentum is conserved<\/p>\n\n\n\n
(b) on the circumference of the circle
(c) inside the circle
(d) Outside the circle<\/p>\n\n\n\n
(a) Up the incline while ascending and down the incline descending
(b) Up the incline while ascending and descending
(c)down the incline while ascending and descending
(d)down the incline while ascending and up the incline descending<\/p>\n\n\n\n
2. c
3.a
4.d
5.d
6.d
7. c
8.c
9.
11. c
12. b
13. e
(A), (B), (C) and (D) are all possible conditions of the particles, but none must be true.
Therefore answer is E.
14. c
15. d
16. a
17.b
18. d
19.a
20. b<\/p>\n\n\n\n
\n(a) only linear momentum remains constant
\n(b) only angular momentum remains constant
\n(c) both linear momentum and angular momentum remains constant
\n(d) neither linear momentum nor angular momentum remain constant<\/p>\n
\n(a) the stone will jerk radially outwards<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[24],"tags":[],"class_list":["post-2574","post","type-post","status-publish","format-standard","hentry","category-general"],"yoast_head":"\n