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Physics - Rotational Motion

Practise 26 BITSAT previous year questions on Rotational Motion, compiled from papers spanning 2009 to 2024. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty BITSAT tests.

Rotational Motion has been asked in 16 of the 16 years of BITSAT papers analysed (2009–2024), with 26 questions in all. 35% of them were easy, 46% moderate and 19% tough. Most of its questions came from 2019, with 3 questions that year. In the last three years (2022–2024) it had 5 questions across 4 papers, about 1.3 per paper.

The chapter's 5 topics are not weighted equally: Moment of inertia of rigid bodies (10 questions, 38%), Rolling without Slipping (6 questions, 23%), and Torque (5 questions, 19%) have been asked the most. Moment of inertia of rigid bodies has also led over the last five years, with 5 questions. Moment of inertia of rigid bodies has produced the most tough questions (2).

  1. 1The moment of inertia of a cube of mass and side about one of its edges is equal to2024 (Memory Based Paper 3)Moment of inertia of rigid bodies
  2. 2A disc is rolling without slipping on a surface. The radius of the disc is . At , the top most point on the disc is as shown in figure. When2023 (Memory Based Paper 1)Rolling without Slipping
  3. 3The torque of a force about the origin is . If the force acts on a particle whose position vector is , then the value of will be :2023 (Memory Based Paper 2)Torque
  4. 4Four holes of radius are cut from a thin square plate of and mass . The moment of inertia of the remaining portion about -axis is2022Moment of inertia of rigid bodies
  5. 5A solid sphere of and radius moving in a space becomes a circular disc of radius in . The rate of change of moment of Inertia in this proces2022Moment of inertia of rigid bodies
  6. 6A round disc of moment of inertia about its axis perpendicular to its plane and passing through its centre is placed over another disc of mo2021Rotational kinematics
  7. 7Three particles, each of mass gram, are situated at the vertices of an equilateral triangle of side (as shown in the figure). The moment of 2021Moment of inertia of rigid bodies
  8. 8A solid cylinder and a hollow cylinder both of the same mass and same external diameter are released from the same height at the same time o2020Rolling without Slipping
  9. 9M.I of a circular loop of radius about the axis in figure is2020Moment of inertia of rigid bodies
  10. 10A semicircular disc of mass M and radius R is free to rotate about its diameter. The moment of inertia of semicircular disc about a line per2019Moment of inertia of rigid bodies
  11. 11A uniform solid cylindrical roller of mass m is being pulled on horizontal surface with force F parallel to the surface applied at its centr2019Rolling without Slipping
  12. 12A cylinder of mass 2 kg is released from rest from the top of an inclined plane of inclination 30 and length 1 m . If the cylinder rolls wit2019Rolling without Slipping
  13. 13If the time period is doubled, then the angular momentum of the body will (provided the moment of inertia of the body is constant)2018Angular momentum and Angular impulse
  14. 14A pulley of radius 2 m is rotated about its axis by a force = 20 t - 5 t 2 newton (where t is measured in seconds) applied tangentially. If 2018Rotational kinematics
  15. 15A uniform rod of length l and mass m is free to rotate in a vertical plane about A . The rod initially in horizontal position is released. T2017Rotational kinematics
  16. 16A circular disc of radius and thickness has moment inertia I about an axis passing through its centre perpendicular to its plane. It is melt2016Moment of inertia of rigid bodies
  17. 17A square gate of size is hinged at its mid-point. A fluid of density fills the space to the left of the gate. The force F required to hold t2015Torque
  18. 18A thin rod of length 41 and mass is bent at the points as shown in figure. What is the moment of inertia of the rod about the axis passes th2015Moment of inertia of rigid bodies
  19. 19An equilateral prism of mass rests on a rough horizontal surface with coefficient of friction . A horizontal force is applied on the prism a2014Torque
  20. 20Two rings of radius and made of same material have the ratio of moment of inertia about an axis passing through centre is 1: 8 . The value o2013Moment of inertia of rigid bodies
  21. 21A particle of mass ' ' is projected with a velocity making an angle of with the horizontal. The magnitude of angular momentum of the project2013Angular momentum and Angular impulse
  22. 22A disc is performing pure rolling on a smooth stationary surface with constant angular velocity as shown in figure. At any instant, for the 2013Rolling without Slipping
  23. 23What is the moment of inertia of a solid sphere of density and radius about its diameter?2012Moment of inertia of rigid bodies
  24. 24A constant torque of is exerted on a pivoted wheel. If angular acceleration of wheel is then the moment of inertia of the wheel is2011Torque
  25. 25The ratio of the accelerations for a solid sphere (mass 'm' and radius 'R') rolling down an incline of angle ' ' without slipping and slippi2010Rolling without Slipping
  26. 26A uniform cube of side a and mass m rests on a rough horizontal table. A horizontal force is applied normal to one of the faces at a point t2009Torque

Frequently Asked Questions

1.How many questions are available for Rotational Motion?

This chapter includes 26 questions compiled from BITSAT papers spanning 2009 to 2024.

2.Are these questions only from BITSAT, or from other exams too?

These are BITSAT 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 BITSAT Physics?

Rotational Motion has appeared in 16 of the 16 years of BITSAT papers covered here, with 26 questions across 17 papers - about 2 per paper it appears in.

4.What is the difficulty level of Rotational Motion questions in BITSAT?

Of the 26 questions analysed for this chapter, 35% are easy, 46% moderate and 19% tough. 2019 had the most, with 3 questions.

5.Which topics in Rotational Motion should I focus on?

These topics have carried the most weightage in Rotational Motion:

  • Moment of inertia of rigid bodies - 10 questions (38%)
  • Rolling without Slipping - 6 questions (23%)
  • Torque - 5 questions (19%)
  • Moment of inertia of rigid bodies has produced the most tough questions (2).
6.Is Rotational Motion's weightage in BITSAT going up or down?

Across all 17 papers analysed, Rotational Motion has averaged about 1.5 questions per paper. In the last three years (2022–2024), that average has fallen, at about 1.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.