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JEE Rotational Motion PYQs with Solutions

632 previous year questions from Rotational Motion (JEE Main & Advanced Physics) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

632 questionsPhysics2006–2026Answers + solutions

About Rotational Motion PYQs

Rotational Motion has 632 previous year questions in the Quantrex Academy JEE Main & Advanced Physics bank. The 220 questions in this list come from JEE Main (168) and JEE Advanced (52), spanning 2006 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

Questions by year (this list)

  • 2026: 31
  • 2025: 29
  • 2024: 23
  • 2023: 24
  • 2022: 22
  • 2021: 44
  • 2020: 15
  • 2018: 2
  • 2017: 5
  • 2016: 1
  • 2015: 3
  • 2014: 2

Rotational Motion questions with solutions

1

Consider a large disk of radius R and two smaller disks, each of radius r = R/50 , lying on its circumference, as shown in the figure. The smaller disks are initially in contact

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2

A solid cylinder of radius R rolls without slipping with a center of mass speed v_0 = (gR)/(3) on a horizontal surface with a vertical edge, as shown in the figure. Here, g is the

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3

List-I shows four planar structures made of uniform solid rods each of mass m and length l . In the List-II the possible moment of inertia of these structures about an axis OCO'

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4

Passage: A uniform circular disk of radius 0.2 m and mass 1 kg is pivoted at its top point C such that it can rotate freely around C in the XY plane, as shown in the figure.

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5

Passage: A uniform circular disk of radius 0.2 m and mass 1 kg is pivoted at its top point C such that it can rotate freely around C in the XY plane, as shown in the figure.

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6

A solid cylinder having radius R and length L is slipping on a rough horizontal plane. At time t=0 the cylinder has a translational velocity v_0=49 m/s, perpendicular to its axis

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7

A solid sphere ( A ) of mass 5m and a spherical shell ( B ) of mass m , both having same radius, are placed on a rough surface. When a force of same magnitude is applied

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8

A solid sphere of radius 4 cm and mass 5 kg is rotating (rotation axis is passing through the centre of the sphere) with an angular velocity of 1200 rpm. It is brought to rest in

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9

A wheel initially at rest is subjected to a uniform angular acceleration about its axis. In the first 2 s it rotates through an angle θ_1 and in the next 2 s it rotates through an

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10

An object of uniform density rolls up the curved path with the initial velocity v_0 as shown in the figure. If the maximum height attained by an object is (7v_0^2)/(10g) ( g =

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11

A solid sphere of mass M and radius R is divided into two unequal parts. The smaller part having mass M/8 is converted into a sphere of radius r and the larger part is converted

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12

Moment of inertia about an axis AB for a rod of mass 40 kg and length 3 m is same as that of a solid sphere of mass of 10 kg and radius R about an axis parallel to AB axis with

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13

A particle is rotating in a circular path and at any instant its motion can be described as θ = (5t^4)/(40) - (t^3)/(3) . The angular acceleration of the particle after 10 seconds

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14

When the position vector r =x i +y j +z k changes sign as - r , which one of the following vector will not flip under sign change ?

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15

A fly wheel having mass 3 kg and radius 5 m is free to rotate about a horizontal axis. A string having negligible mass is wound around the wheel and the loose end of the string is

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16

Two circular discs of radius each 10 cm are joined at their centres by a rod of length 30 cm and mass 600 gm as shown in figure. If the mass of each disc is 600 gm and applied

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17

A solid sphere of radius 10 cm is rotating about an axis which is at a distance 15 cm from its centre. The radius of gyration about this axis is n ~cm . The value of n is

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18

A thin uniform rod (X) of mass M and length L is pivoted at a height ((L)/(3)) as shown in the figure. The rod is allowed to fall from a vertical position and lie horizontally on

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19

A uniform solid cylinder of length L and radius R has moment of inertia about its axis equal to I_ 1 . A small co-centric cylinder of length L / 2 and radius R / 3 carved from

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20

Two masses 400 g and 350 g are suspended from the ends of a light string passing over a heavy pulley of radius 2 cm. When released from rest the heavier mass is observed to fall

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21

Suppose there is a uniform circular disc of mass M ~kg and radius r ~m shown in figure. The shaded regions are cut out from the disc. The moment of inertia of the remainder about

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22

Two small balls with masses m and 2 m are attached to both ends of a rigid rod of length d and negligible mass. If angular momentum of this system is L about an axis ( A ) passing

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23

The moment of inertia of a square loop made of four uniform solid cylinders, each having radius R and length L(R<L) about an axis passing through the mid points of opposite sides

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24

A uniform bar of length 12 cm and mass 20 m lies on a smooth horizontal table. Two point masses m and 2 m are moving in opposite directions with same speed of v and in the same

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25

Two masses m and 2 m are connected by a light string going over a pulley (disc) of mass 30 m with radius r=0.1 ~m . The pulley is mounted in a vertical plane and it is free to

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26

A solid sphere of mass 5 kg and radius 10 cm is kept in contact with another solid sphere of mass 10 kg and radius 20 cm. The moment of inertia of this pair of spheres about the

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27

A circular disc has radius R_ 1 and thickness T_ 1 . Another circular disc made of the same material has radius R_ 2 and thickness T_ 2 . If the moment of inertia of both discs

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28

The pulley shown in figure is made using a thin rim and two rods of length equal to diameter of the rim. The rim and each rod have a mass of M . Two blocks of mass of M and m are

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29

Two cars A and B each of mass 10^ 3 ~kg are moving on parallel tracks separated by a distance of 10 m, in same direction with speeds 72 ~km / h and 36 ~km / h . The magnitude of

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30

A uniform rod of mass m and length l suspended by means of two identical inextensible light strings as shown in figure. Tension in one string immediately after the other string is

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31

Two identical thin rods of mass M ~kg and length L ~m are connected as shown in figure. Moment of inertia of the combined rod system about an axis passing through point P and

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32

A rod of linear mass density ' λ ' and length ' L ' is bent to form a ring of radius 'R'. Moment of inertia of ring about any of its diameter is :

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33

A thin solid disk of 1 kg is rotating along its diameter axis at the speed of 1800 rpm. By applying an external torque of 25 π Nm for 40 s, the speed increases to 2100 rpm. The

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34

A cube having a side of 10 cm with unknown mass and 200 gm mass were hung at two ends of an uniform rigid rod of 27 cm long. The rod along with masses was placed on a wedge

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35

M and R be the mass and radius of a disc. A small disc of radius R / 3 is removed from the bigger disc as shown in figure. The moment of inertia of remaining part of bigger disc

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36

A, B and C are disc, solid sphere and spherical shell respectively with same radii and masses. These masses are placed as shown in figure. The moment of inertia of the given

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37

A solid sphere with uniform density and radius R is rotating initially with constant angular velocity (ω_1) about its diameter. After some time during the rotation its starts

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38

A wheel is rolling on a plane surface. The speed of a particle on the highest point of the rim is 8 ~m / s . The speed of the particle on the rim of the wheel at the same level as

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39

Which of the following are correct expression for torque acting on a body? B. τ = d dt ( r × p ) C. τ = r × d p dt D. τ =I α E. τ = r × F ( r = position vector; p = linear

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40

If L and P represent the angular momentum and linear momentum respectively of a particle of mass ' m ' having position vector r =a( i ω t+ j ω t) . The direction of force is

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41

A circular ring and a solid sphere having same radius roll down on an inclined plane from rest without slipping. The ratio of their velocities when reached at the bottom of the

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42

A force of 49 N acts tangentially at the highest point of a sphere (solid) of mass 20 kg , kept on a rough horizontal plane. If the sphere rolls without slipping, then the

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43

The moment of inertia of a circular ring of mass M and diameter r about a tangential axis lying in the plane of the ring is :

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44

A wheel of radius 0.2 m rotates freely about its center when a string that is wrapped over its rim is pulled by force of 10 N as shown in figure. The established torque produces

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45

Moment of inertia of a rod of mass ' M ' and length 'L' about an axis passing through its center and normal to its length is ' α '. Now the rod is cut into two equal parts and

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46

A square Lamina OABC of length 10 cm is pivoted at 'O'. Forces act at Lamina as shown in figure. If Lamina remains stationary, then the magnitude of F is :

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47

A cord of negligible mass is wound around the rim of a wheel supported by spokes with negligible mass. The mass of wheel is 10 kg and radius is 10 cm and it can freely rotate

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48

Three equal masses m are kept at vertices (A, B, C) of an equilateral triangle of side a in free space. At t=0 , they are given an initial velocity V _A=V_0 A C , V _B=V_0 B A and

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49

The coordinates of a particle with respect to origin in a given reference frame is \((1,1,1)\) meters. If a force of \( F = i - j + k \) acts on the particle, then the magnitude

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50

Two iron solid discs of negligible thickness have radii R_1 and R_2 and moment of intertia I_1 and I_2 , respectively. For R_2=2 R_1 , the ratio of I_1 and I_2 would be 1 / x

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51

The moment of inertia of a solid disc rotating along its diameter is 2.5 times higher than the moment of inertia of a ring rotating in similar way. The moment of inertia of a

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52

A solid sphere and a hollow sphere of the same mass and of same radius are rolled on an inclined plane. Let the time taken to reach the bottom by the solid sphere and the hollow

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53

A solid sphere is rolling without slipping on a horizontal plane. The ratio of the linear kinetic energy of the centre of mass of the sphere and rotational kinetic energy is :

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54

A uniform solid cylinder of mass ' m ' and radius ' r ' rolls along an inclined rough plane of inclination 45^ ∘ . If it starts to roll from rest from the top of the plane then

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55

An object of mass ' m ' is projected from origin in a vertical x y plane at an angle 45^ ∘ with the x axis with an initial velocity v_0 . The magnitude and direction of the

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56

A circular disk of radius R meter and mass M kg is rotating around the axis perpendicular to the disk. An external torque is applied to the disk such that θ(t)=5 t^2-8 t , where

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57

A solid sphere of mass ' m ' and radius ' r ' is allowed to roll without slipping from the highest point of an inclined plane of length ' L ' and makes an angle 30^ ∘ with the

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58

The torque due to the force (2 i + j +2 k ) about the origin, acting on a particle whose position vector is ( i + j + k ) , would be

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59

A uniform circular disc of radius ' R ' and mass ' M ' is rotating about an axis perpendicular to its plane and passing through its centre. A small circular part of radius R / 2

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60

The position vectors of two 1 kg particles, (A) and (B), are given by r _ A =(α_1 t^2 i +α_2 t j +α_3 t k ) m and r _ B =(β_1 t i +β_2 t^2 j +β_3 t k ) m , respectively; (α_1=1 ~m

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61

A disc of mass M and radius R is free to rotate about its vertical axis as shown in the figure. A battery operated motor of negligible mass is fixed to this disc at a point on its

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62

A thin uniform rod of length L and certain mass is kept on a frictionless horizontal table with a massless string of length L fixed to one end (top view is shown in the figure).

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63

A circular disc reaches from top to bottom of an inclined plane of length l . When it slips down the plane, if takes t ~s . When it rolls down the plane then it takes ((α)/(2))^ 1

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64

A heavy iron bar, of weight W is having its one end on the ground and the other on the shoulder of a person. The bar makes an angle θ with the horizontal. The weight experienced

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65

A string is wrapped around the rim of a wheel of moment of inertia 0.40 kgm^2 and radius 10 ~cm . The wheel is free to rotate about its axis. Initially the wheel is at rest. The

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66

A thin circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with angular velocity ω . If

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67

A block is simply released from the top of an inclined plane as shown in the figure above. The maximum compression in the spring when the block hits the spring is :

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68

Three balls of masses 2 ~kg, 4 ~kg and 6 ~kg respectively are arranged at centre of the edges of an equilateral triangle of side 2 ~m . The moment of intertia of the system about

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69

If the radius of earth is reduced to three-fourth of its present value without change in its mass then value of duration of the day of earth will be ______ hours 30 minutes.

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70

A hollow sphere is rolling on a plane surface about its axis of symmetry. The ratio of rotational kinetic energy to its total kinetic energy is (x)/(5) . The value of x is _____ .

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71

Ratio of radius of gyration of a hollow sphere to that of a solid cylinder of equal mass, for moment of Inertia about their diameter axis AB as shown in figure is 8 / x . The

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72

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 heights h_1 and

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73

A disc of radius R and mass M is rolling horizontally without slipping with speed v . It then moves up an inclined smooth surface as shown in figure. The maximum height that the

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74

A ball of mass 0 . 5kg is attached to a string of length 50cm . The ball is rotated on a horizontal circular path about its vertical axis. The maximum tension that the string can

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75

Two identical spheres each of mass 2kg and radius 50cm are fixed at the ends of a light rod so that the separation between the centers is 150cm . Then, moment of inertia of the

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76

A body of mass m is projected with a speed u making an angle of 45 ^ o with the ground. The angular momentum of the body about the point of projection, at the highest point is

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77

Two discs of moment of inertia I _ 1 = 4kg m ^ 2 and I _ 2 = 2kg m ^ 2 about their central axes & normal to their planes, rotating with angular speeds 10rad s ^ - 1 and 4rad s ^

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78

Consider a disc of mass 5kg , radius 2m , rotating with angular velocity of 10rad s ^ - 1 about an axis perpendicular to the plane of rotation. An identical disc is kept gently

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79

A body of mass 5kg moving with a uniform speed 3 2 m s ^ - 1 in X - Y plane along the line y = x + 4 . The angular momentum of the particle about the origin will be _______ kg m ^

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80

A cylinder is rolling down on an inclined plane of inclination 60 ° . Its acceleration during rolling down will be x 3 m s ^ - 2 , where x = _______(use g = 10m s ^ - 2 ).

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81

A ring and a solid sphere roll down the same inclined plane without slipping. They start from rest. The radii of both bodies are identical and the ratio of their kinetic energies

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82

A heavy iron bar of weight 12kg is having its one end on the ground and the other on the shoulder of a man. The rod makes an angle 60 ° with the horizontal, the normal force

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83

Four particles, each of mass 1kg are placed at four corners of a square of side 2m . The moment of inertia of the system about an axis perpendicular to its plane and passing

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84

An annular disk of mass M , inner radius a and outer radius b is placed on a horizontal surface with coefficient of friction μ , as shown in the figure. At some time, an impulse J

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85

A thin circular coin of mass 5gm and radius (4)/(3)cm is initially in a horizontal xy -plane. The coin is tossed vertically up ( + z direction) by applying an impulse of (π)/(2) ×

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86

A solid sphere and a solid cylinder of same mass and radius are rolling on a horizontal surface without slipping. The ratio of their radius of gyrations respectively ( k _ sph : k

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87

A light rope is wound around a hollow cylinder of mass 5kg and radius 70cm . The rope is pulled with a force of 52 . 5N . The angular acceleration of the cylinder will be _____

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88

A solid sphere is rolling on a horizontal plane without slipping. If the ratio of angular momentum about axis of rotation of the sphere to the total energy of moving sphere is π

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89

For rolling spherical shell, the ratio of rotational kinetic energy and total kinetic energy is (x)/(5) . The value of x is _____.

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90

A circular plate is rotating in horizontal plane, about an axis passing through its centre and perpendicular to the plate, with an angular velocity ω . A person sits at the centre

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91

A solid sphere of mass 500g radius 5cm is rotated about one of its diameter with angular speed of 10rad s ^ - 1 . If the moment of inertia of the sphere about its tangent is x ×

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92

A force of - P ^ k acts on the origin of the coordinate system. The torque about the point ( 2, - 3 ) is P ( a ^ i + b ^ j ) , The ratio of (a)/(b) is (x)/(2) . The value of x is

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93

The moment of inertia of a semicircular ring about an axis, passing through the center and perpendicular to the plane of ring, is (1)/(x) MR ^ 2 , where R is the radius and M is

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94

A ring and a solid sphere rotating about an axis passing through their centres have same radii of gyration. The axis of rotation is perpendicular to plane of ring. The ratio of

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95

Two identical solid spheres each of mass 2kg and radii 10cm are fixed at the ends of a light rod. The separation between the centres of the spheres is 40cm . The moment of inertia

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96

Moment of inertia of a disc of mass M and radius &#39; R &#39; about any of its diameter is M R ^ 2 4 . The moment of inertia of this disc about an axis normal to the disc and

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97

A solid cylinder is released from rest from the top of an inclined plane of inclination 30 ° and length 60cm . If the cylinder rolls without slipping, its speed upon reaching the

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98

Two discs of same mass and different radii are made of different materials such that their thicknesses are 1cm and 0 . 5cm respectively. The densities of materials are in the

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99

A solid sphere of mass 1kg rolls without slipping on a plane surface. Its kinetic energy is 7 × 10 ^ - 3 J . The speed of the centre of mass of the sphere is ______ cm s ^ - 1 .

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100

A uniform disc of mass 0 . 5kg and radius r is projected with velocity 18m s ^ - 1 at t = 0s on a rough horizontal surface. It starts off with a purely sliding motion at t = 0s .

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101

A thin uniform rod of length 2m , cross sectional area A and density d is rotated about an axis passing through the centre and perpendicular to its length with angular velocity ω

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102

A solid sphere of mass 2kg is making pure rolling on a horizontal surface with kinetic energy 2240J . The velocity of centre of mass of the sphere will be ______ m s ^ - 1 .

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103

If a solid sphere of mass 5kg and a disc of mass 4kg have the same radius, then the ratio of moment of inertia of the disc about a tangent in its plane to the moment of inertia of

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104

An object of mass 8kg is hanging from one end of a uniform rod CD of mass 2kg and length 1m pivoted at its end C on a vertical wall as shown in figure. It is supported by a cable

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105

I _ CM is moment of inertia of a circular disc about an axis (CM) passing through its center and perpendicular to the plane of disc. I _ AB is its moment of inertia about an axis

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106

A uniform solid cylinder with radius R and length L has moment of inertia I _ 1 , about the axis of cylinder. A concentric solid cylinder of radius R ^ ' = (R)/(2) and length L ^

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107

Solid sphere A is rotating about an axis PQ . If the radius of the sphere is 5cm , then its radius of gyration about PQ will be x cm . The value of x is _____.

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108

A flat surface of a thin uniform disk A of radius R is glued to a horizontal table. Another thin uniform disk B of mass M and with the same radius R rolls without slipping on the

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109

At time t = 0 , a disk of radius 1m starts to roll without slipping on a horizontal plane with an angular acceleration of α = (2)/(3)rad s ^ - 2 . A small stone is stuck to the

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110

A solid sphere of mass 1kg and radius 1m rolls without slipping on a fixed inclined plane with an angle of inclination θ = 30 ° from the horizontal. Two forces of magnitude 1N

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111

The torque of a force 5 ^ i + 3 ^ j - 7 ^ k about the origin is τ . If the force acts on a particle whose position vector is 2 ^ i + 2 ^ j + ^ k , then the value of τ will be

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112

Four identical discs each of mass &#39; M &#39; and diameter &#39; a &#39; are arranged in a small plane as shown in figure. If the moment of inertia of the system about O O ^ '

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113

A solid cylinder length is suspended symmetrically through two massless strings, as shown in the figure. The distance from the initial rest position, the cylinder should be

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114

A pulley of radius 1 . 5m is rotated about its axis by a force F = (12t - 3 t ^ 2 )N applied tangentially (while t is measured in seconds). If moment of inertia of the pulley

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115

The radius of gyration of a cylindrical rod about an axis of rotation perpendicular to its length and passing through the center will be _____ m . Given, the length of the rod is

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116

A disc of mass 1kg and radius R is free of rotate about a horizontal axis passing through its centre and perpendicular to the plane of disc. A body of same mass as that of disc is

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117

A solid cylinder and a solid sphere, having same mass M and radius R , roll down the same inclined plane from top without slipping. They start from rest. The ratio of velocity of

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118

The moment of inertia of a uniform thin rod about a perpendicular axis passing through one end is I _ 1 . The same rod is bent into a ring and its moment of inertia about a

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119

A spherical shell of 1kg mass and radius R is rolling with angular speed ω on horizontal plane (as shown in figure). The magnitude of angular momentum of the shell about the

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120

A 34 m long ladder weighing 10kg leans on a frictionless wall. Its feet rest on the floor 3m away from the wall as shown in the figure. If F _ f and F _ w are the reaction forces

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