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Rotational Mechanics Questions

Practice 27 Rotational Mechanics questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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27
Total Questions
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2
Easy
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23
Medium
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2
Hard
Practice by Exam:Physics(27)

About Rotational Mechanics — practice questions, PYQs & concepts

Rotational Mechanics is a frequently-tested topic on Physics. ExamTest.live currently lists 27 Rotational Mechanics questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Rotational Mechanics weight in competitive exams

Across our Rotational Mechanics question bank, the largest sources are Physics (27). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 2 easy Rotational Mechanics questions are available — build fluency before moving up.
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All Rotational Mechanics Questions(1–27 of 27)

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Q1mediummcqPhysicsAIEEE 20042026
0% accuracy
A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same, which one of the following will not be affected?
Q2mediummcqPhysicsAIEEE 20072026
0% accuracy
Angular momentum of a particle rotating with a central force is constant due to:
Q3mediummcqPhysicsAIEEE 20072026
0% accuracy
A round uniform body of radius , mass and moment of inertia , rolls down (without slipping) an inclined plane making an angle with the horizontal. Then its acceleration is:
image
Q4mediummcqPhysicsAIEEE 20072026
0% accuracy
For a given uniform square lamina with centre , let and be the moments of inertia about the diagonal and the line passing through and parallel to side respectively. Then:
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Q5mediummcqPhysicsNEET 20222026
The angular speed of a fly wheel moving with uniform angular acceleration changes from to in . The angular acceleration in is:
Q6mediummcqPhysicsFIITJEE AIEEE 2011 (Set Q)2026
A pulley of radius is rotated about its axis by a force Newton (where is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is , the number of rotations made by the pulley before its direction of motion is reversed, is:
Q7mediummcqPhysicsFIITJEE AIEEE 2011 (Set Q)2026
A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, the angular speed of the disc:
Q8mediummcqPhysicsFIITJEE AIEEE 2011 (Set Q)2026
A mass hangs with the help of a string wrapped around a pulley on a frictionless bearing. The pulley has mass and radius . Assuming pulley to be a perfect uniform circular disc, the acceleration of the mass , if the string does not slip on the pulley, is:
Q9mediummcqPhysicsAIEEE 20092026
A thin uniform rod of length and mass is swinging freely about a horizontal axis passing through its end. Its maximum angular speed is . Its centre of mass rises to a maximum height of:
Q10mediummcqPhysicsAIEEE 20032026
A circular disc of radius is made from an iron plate of thickness , and another disc of radius is made from an iron plate of thickness . The relation between the moment of inertia and is:
Q11mediummcqPhysicsAIEEE 20032026
A particle performing uniform circular motion has angular momentum . If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is:
Q12mediummcqPhysicsAIEEE 20032026
Let be the force acting on a particle having position vector and be the torque of this force about the origin. Then:
Q13mediummcqPhysicsNEET 20232026
The ratio of radius of gyration of a solid sphere of mass and radius about its own axis to the radius of gyration of a thin hollow sphere of same mass and radius about its axis is:
Q14easymcqPhysicsNEET 20232026
The angular acceleration of a body, moving along the circumference of a circle, is:
Q15mediummcqPhysicsNEET 20222026
The ratio of the radius of gyration of a thin uniform disc about an axis passing through its centre and normal to its plane to the radius of gyration of the disc about its diameter is:
Q16mediummcqPhysicsNEET 20212026
A uniform rod of length and mass is balanced on a wedge placed at mark. A mass of is suspended from the rod at and another unknown mass is suspended from the rod at mark. Find the value of such that the rod is in equilibrium. ()
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Q17mediummcqPhysicsNEET 20212026
From a circular ring of mass and radius an arc corresponding to a sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is times . Then the value of is:
Q18mediummcqPhysicsPhysics
0% accuracy
The Sun rotates around its centre once in days. What will be the period of revolution if the Sun were to expand to twice its present radius without any external influence? Assume the Sun to be a sphere of uniform density.
Q19hardmcqPhysicsPhysics
3% accuracy
A sphere of radius is cut from a larger solid sphere of radius as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is:

image
Q20easymcqPhysicsPhysics
The ratio of the accelerations for a solid sphere (mass ‘m’ and radius ‘R’) rolling down an incline of angle ‘ ’ without slipping and slipping down the incline without rolling is:
Q21mediummcqPhysicsPhysics
A solid cylinder of mass and radius is free to rotate about the horizontal axis. A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of is:
Q22mediummcqPhysicsPhysics
A circular disk of moment of inertia is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed . Another disk of moment of inertia is dropped coaxially onto the rotating disk. Initially the second disk has zero angular speed. Eventually both the disks rotate with a constant angular speed . The energy lost by the initially rotating disc to friction is:
Q23mediummcqPhysicsPhysics
Four identical thin rods each of mass and length , form a square frame. Moment of inertia of this frame about an axis through the centre of the square and perpendicular to its plane is:
Q24mediummcqPhysicsPhysics
A thin circular ring of mass and radius is rotating in a horizontal plane about an axis vertical to its plane with a constant angular velocity . If two objects each of mass be attached gently to the opposite ends of a diameter of the ring, the ring will then rotate with an angular velocity:
Q25mediummcqPhysicsPhysics
A thin rod of length and mass is bent at its midpoint into two halves so that the angle between them is . The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is:
Q26mediummcqPhysicsPhysics
The ratio of the radii of gyration of a circular disc to that of a circular ring, each of the same mass and radius, around their respective axes (passing through the center and perpendicular to the plane) is:
Q27hardmcqPhysicsPhysics
A given shaped glass tube having uniform cross section is filled with water and is mounted on a rotatable shaft as shown in figure. If the tube is rotated with a constant angular velocity then:

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