Rotational Mechanics: JEE Main Physics Previous Year Questions

410 previous year questions from Rotational Mechanics. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $Two discs of same mass and same thickness (t) are made from two different matcrials of densities ' d_{1}' and ' d_{2}' respectively. The ratio of the moment o\dots$
2. $The ratio of the radii of gyration of a circular disc about a tangential axis in the plane of the disc and of a circular ring of the same radius about a tangential axis i\dots$
3. $A particle starting from rest, moves in a circle of radius^{’} r'. It attains a velocity of v_{0} m / s in the n th round. Its angular acce\dots$
4. $A solid homogenous sphere of mass M and radius is moving on a rough horizontal surface, partly rolling and partly sliding. During this kind of motion of this sphere$
5. $The ratio of angular speed of hour hand of a watch to the angular speed of earth's rotation about its axis, is$
6. $A sphere and a hollow cylinder without slipping, roll down two separate inclined planes A and B, respectively. They cover same distance in a given duration. If the\dots$
7. $Three objects, A : (a solid sphere), B : (a thin circular disc) and C : (a circular ring), each have the same mass M and radius R . They all spin with the s\dots$
8. $If F is the force acting on a particle having position vector y and τ be the torque of this force about the origin, then$
9. $Two rotating bodies A and B of masses m and 2 m with moments of inertia I_{A} and I_{B} (I_{B} > I_{A}) have equal kinetic energy of r\dots$
10. $A disc is rotating with angular speed 00. If a child sits on it, what is conserved?$
11. $Consider two uniform discs of the same thickness and different radii R_{1} = R and R_{2} = αR made of the same material. If the ratio of their moments of ine\dots$
12. $If an energy of 684 J is needed to increase the speed of a flywheel from 180 rpm to 360 rpm, then find its moment of inertia.$
13. $When a 12000 joule of work is done on a flywheel, its frequency of rotation increases from 10 to 20 Hz . The moment of inertia of flywheel about its axis o\dots$
14. $An object undergoing simple harmonic motion takes 0.5 s to travel from one point of zero velocity to the next such point. The angular frequency of the motion is$
15. $The following bodies are made to roll up (without slipping) the same inclined plane from a horizontal plane: (i) a ring of radius\dots$
16. $In vertical circular motion, the ratio of kinetic energy of a particle at highest point to that at lowest point is$
17. $A thin smooth rod of length L and mass M is rotating freely with angular speed ω_{0} about an axis perpendicular to the rod and passing through its cente\dots$
18. $A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm. What is the angular acceleration of the cylinder if the rope is pulled with a force of 30 N ?$
19. $A solid sphere of 100 kg and radius 10 m moving in a space becomes a circular disc of radius 20 m in one hour. Then the rate of change of moment of inertia i\dots$
20. $The angular speed of the wheel of a vehicle is increased from 360 rpm to 1200 rpm in 14 s. Its angular acceleration is [NEET 2020]$
21. $A solid sphere and a hollow cylinder roll up without slipping on same inclined plane with same initial speed v . The sphere and the cylinder reaches upto maximum height\dots$
22. $For a particle moving in vertical circle, the total energy at different positions along the path$
23. $A solid sphere of mass m and radius R is rotating about its diameter. A solid cylinder of the same mass and same radius is also rotating about its geometrical axis\dots$
24. $From a circular ring of mass M and radius R, an arc corresponding to a 90^{\circ} sector is removed. The moment of inertia of the remaining part of the ring a\dots$
25. $A force F = 5 i + 2 j - 5 k acts on a particle whose position vector is r = i - 2 j + k . What is the torque about the origin?$

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Rotational Mechanics: JEE Main Physics Previous Year Questions

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