Rotational motion — practice questions
50 curated practice questions from Rotational motion (Physics NEET, NTA Exams) — 22 easy, 15 medium, 13 hard. Every question includes the final answer free; step-by-step worked solutions with a free account.
- A door 1.6 m wide requires a force of 1 N to be applied at the free end to open or close it. The force that is required…
- Given below are two statements Statement I : It is harder to open and shut the door if we apply force near the hinge…
- If the Earth is treated as a sphere of radius R and mass M, its angular momentum about the axis of rotation with the…
- Two particles A and B initially at rest, move towards each other under mutual force of attraction. At an instance when…
- A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its…
- Two blocks of masses 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless…
- A body rolls down an inclined plane. If its kinetic energy of rotation is 40% of its kinetic energy of translation…
- If the Earth shrinks such that its mass does not change but radius decreases to one quarter of its original value then…
- The diameter of a solid disc is 0.5 m and its mass is 16 kg. It is allowed to rotate about an axis passing through its…
- Moments of inertia of two rings are in the ratio 2 : 1 and their diameters in the ratio 2 : 1. The ratio of their…
- The angular acceleration of a body, moving along the circumference of a circle, is:
- The angular speed of a flywheel increases from 60 rpm to 180 rpm when 98.7 J of work is done on a flywheel. The moment…
- A constant torque of 100 N m turns a wheel of moment of inertia 300 kg m2 about an axis passing through its centre…
- Two identical particles move towards each other with velocity 2v and v respectively. The velocity of centre of mass is
- A circular disc is to be made using iron and aluminum. To keep its moment of inertia maximum about a geometrical axis…
- A thin uniform rod of length L and mass m is swinging freely about a horizontal axis passing through its end. Its…
- A triangular plate is shown. A force is applied at point The torque at point with respect to point and are [JEE (Main)…
- A thin circular ring of mass M and radius r is rotating about its axis with a constant angular velocity ω. Four objects…
- A body rolls down an inclined plane. If the kinetic energy of its rotational motion is 40% of the kinetic energy of its…
- A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same, which one of the…
- A wheel having moment of inertia 2 kg-m 2 about its vertical axis, rotates at the rate of 60 rpm about this axis. The…
- Assertion : The velocity of a body at the bottom of an inclined plane of given height is more when it slides down the…
- Two circular loops L 1 and L 2 are made from a uniform wire. The radius of L 1 and L 2 are r 1 and r 2 . Their…
- A round disc of moment of inertia 1_ 2 about its axis perpendicular to its plane and passing through its centre is…
- The angular speed of a body changes from ω 1 to ω 2 without applying a torque but due to change in its moment of…
- Two bodies of mass 1 kg and 3 kg have the position vectors i +2 j + k and -3 i -2 j + k respectively. The centre of…
- The radius of gyration of a rod of mass M and length L about an axis passing through its C.G. and perpendicular to its…
- The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200 rpm to 3120 rpm in 16…
- Angular momentum is [DPMT 2000; CPMT 2002, 03]
- Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the…
- If a particle of mass m is moving with constant velocity v parallel to x -axis in x - y plane as shown in fig. Its…
- The ratio of radius of gyration of a solid sphere of mass M and radius R about its own axis to the radius of gyration…
- A particle of mass m is circulating on a circle of radius r having angular momentum L, then the centripetal force will…
- Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A)…
- Angular momentum of the particle rotating with a central force is constant due to
- A cylindrical body having mass M and radius R rolls down an inclined plane without slipping. If K be the radius of…
- A cylinder rolls up an inclined plane, reaches some height and then rolls down without slipping throughout these…
- Two particles A and B initially at rest, move towards each other by mutual force of attraction. At the instant when the…
- A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy (K t ) as well as…
- An object placed on a ground is in stable equilibrium. If the object is given a slight push then initially the position…
- Moment of inertia of an uniform circular disc about a diameter is I . The moment of inertia about an axis perpendicular…
- Initial angular velocity of a circular disc of mass M is ω 1 . Then two small spheres of mass m are attached gently to…
- A force F =6 +3 +6 k is acting at a point r =2 i -6 j -12 k . The value of α for which angular momentum about origin is…
- A dancer on ice spins faster when she folds her arm. This is due to
- The ratio of the radii of gyration of a circular disc to that of a circular ring, each of the same mass and radius…
- The ratio of the radius of gyration of a thin uniform disc about an axis passing through its centre and normal to its…
- A girl stands at the centre of a turntable with her two arms out stretched. The turntable is set rotating with an…
- Given below are two statements Statement I : The position of centre of mass of a body depends upon shape, and…
- If two circular discs of the same weight and thickness are made from metal of different densities, d 1 and d 2 (d 1 > d…
- A body A of mass M while falling vertically downwards under gravity breaks into two parts; a body B of mass 1/3 M and…