Physics - Rotational Motion
Practise 27 WBJEE previous year questions on Rotational Motion, compiled from papers spanning 2011 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty WBJEE tests.
Rotational Motion has been asked in 11 of the 18 years of WBJEE papers analysed (2009–2026), with 27 questions in all. 19% of them were easy, 59% moderate and 22% tough. Most of its questions came from 2013, with 5 questions that year. In the last three years (2024–2026) it had 6 questions across 3 papers, about 2 per paper.
The chapter's 5 topics are not weighted equally: Angular momentum and Angular impulse (11 questions, 41%), Moment of inertia of rigid bodies (6 questions, 22%), and Rotational kinematics (5 questions, 19%) have been asked the most. Angular momentum and Angular impulse has also led over the last five years, with 4 questions. Angular momentum and Angular impulse has produced the most tough questions (3).
- 1A uniform rod AB is suspended from a point P, at a variable distance , from A, as shown in figure. To make the rod horizontal, a mass ' ' is2026Torque
- 2The moment of inertia of a thin disc about axes are and respectively, as shown in figure. If the moment of inertia about an axis passing thr2026Moment of inertia of rigid bodies
- 3The position vector of a particle of mass moving with a constant velocity is given by , where is a constant. At an instant, makes an angle w2024Angular momentum and Angular impulse
- 4A small ball of mass is suspended from the ceiling of a floor by a string of length . The ball moves along a horizontal circle with constant2024Angular momentum and Angular impulse
- 5A small sphere of mass and radius slides down the smooth surface of a large hemispherical bowl of radius . If the sphere starts sliding from2024Rotational kinematics
- 6A uniform rod AB of length 1m and mass 4kg is sliding along two mutually perpendicular frictionless walls OX and OY. The velocity of the two2024Rotational kinematics
- 7A particle of mass \( {m}\) is projected at a velocity \( {u}\), making an angle \( \) with the horizontal ( \( {x}\)-axis). If the angle of2023Angular momentum and Angular impulse
- 8particle is moving in an elliptical orbit as shown in figure. If and denote the linear momentum, angular momentum and position vector of the2022Angular momentum and Angular impulse
- 9Three particles, each of mass ' ' grams situated at the vertices of an equilateral of side ' ' (as shown in the figure). The moment of inert2022Moment of inertia of rigid bodies
- 10A uniform thin rod of length , mass is lying on a smooth horizontal table. A horizontal impulse is suddenly applied perpendicular to the rod2021Angular momentum and Angular impulse
- 11A uniform rod of length pivoted at one end is freely rotated in a horizontal plane with an angular velocity about a vertical axis passing th2021Angular momentum and Angular impulse
- 12A steel and a brass wire, each of length and cross-sectional area hang from a ceiling and are apart. Lower ends of the wires are attached to2020Torque
- 13Two metallic spheres of equal outer radii are found to have same moment of inertia about their respective diameters. Then which of the follo2020Moment of inertia of rigid bodies
- 14A simple pendulum of length is displaced so that its taught string is horizontal and then released. A uniform bar pivoted at one end is simu2020Rotational kinematics
- 15A solid spherical ball and a hollow spherical ball of two different materials of densities and respectively have same outer radii and same m2018Moment of inertia of rigid bodies
- 16"Two particles and are moving as shown. in the figure. Their total angular momentum about the point is2015Angular momentum and Angular impulse
- 17A circular disc rolls on a horizontal Iloor without slipping and the centre of the disc moves with a uniform velocity . Which of the followi2015Rolling without Slipping
- 18A uniform solid spherical ball is rolling down a smooth inclined plane from a height . The velocity attained by the ball when it reaches the2014Rolling without Slipping
- 19A solid uniform sphere resting on a rough horizontal plane is given a horizontal impulse directed through its centre so that it starts slidi2014Angular momentum and Angular impulse
- 20Three identical square plates rotate about the axes shown in the figure in such a way that their kinetic energies are equal. Each of the rot2014Moment of inertia of rigid bodies
- 21A thin rod is held horizontally so that it can freely rotate in a vertical plane about the end as shown in the figure. The potential energy 2014Torque
- 22The velocity of a car travelling on a straight road is at an instant of time. Now travelling with uniform acceleration for , the velocity be2013Rotational kinematics
- 23Four small objects each of mass are fixed at the corners of a rectangular wire-frame of negligible mass and of sides and If the wire frame i2013Moment of inertia of rigid bodies
- 24A planet moves around the sun in an elliptical orbit with the sun at one of its foci. The physical quantity associated with the motion of th2013Angular momentum and Angular impulse
- 25An electron of charge and mass is moving in a circular of radius with a uniform angular speed Then which of the following statements are cor2013Angular momentum and Angular impulse
- 26A bar of length L carrying a small mass at one of its ends rotates with a uniform angular speed in a vertical plane about the mid point of t2013Rotational kinematics
- 27If the Earth were to suddenly contract to \( {1}{n}\) th of its present radius without any change in its mass, the duration of the new day w2011Angular momentum and Angular impulse
Frequently Asked Questions
1.How many questions are available for Rotational Motion?
This chapter includes 27 questions compiled from WBJEE papers spanning 2011 to 2026.
2.Are these questions only from WBJEE, or from other exams too?
These are WBJEE questions specifically for the Rotational Motion chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.
3.Is Rotational Motion an important chapter for WBJEE Physics?
Rotational Motion has appeared in 11 of the 18 years of WBJEE papers covered here, with 27 questions across 11 papers - about 2 per paper it appears in.
4.What is the difficulty level of Rotational Motion questions in WBJEE?
Of the 27 questions analysed for this chapter, 19% are easy, 59% moderate and 22% tough. 2013 had the most, with 5 questions.
5.Which topics in Rotational Motion should I focus on?
These topics have carried the most weightage in Rotational Motion:
- Angular momentum and Angular impulse - 11 questions (41%)
- Moment of inertia of rigid bodies - 6 questions (22%)
- Rotational kinematics - 5 questions (19%)
- Angular momentum and Angular impulse has produced the most tough questions (3).
6.Is Rotational Motion's weightage in WBJEE going up or down?
Across all 11 papers analysed, Rotational Motion has averaged about 2.5 questions per paper. In the last three years (2024–2026), that average has fallen, at about 2.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.