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Systems of Particles and Rotational Motion — NEET & JEE Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

Which condition defines an ideal rigid body?
  1. Distances between every pair of its particles remain fixed ✓
  2. Every particle remains at rest in one reference frame
  3. Its centre of mass must coincide with material in the body
  4. No external force can act on it
Answer: A. Ideal rigidity means that all interparticle distances remain unchanged during motion.
Why not B: A rigid body may translate or rotate; rigidity constrains relative separations, not absolute motion.
Why not C: The centre of mass can lie in empty space, as it does for a ring.
Why not D: External forces may accelerate or rotate a rigid body without changing its ideal shape.
A 3.00 kg point mass is 2.00 m from a rotation axis. What is its moment of inertia about that axis?
  1. 6.00 kg m²
  2. 3.00 kg m²
  3. 12.0 kg m² ✓
  4. 36.0 kg m²
Answer: C. For a point mass I=mr²=3.00×(2.00)²=12.0 kg m².
Why not A: This uses mr and forgets that perpendicular distance is squared.
Why not B: This reports the mass alone and ignores its distance from the axis.
Why not D: This squares the product mr instead of squaring only the distance.
A projectile explodes into fragments while airborne, with air resistance neglected. How does the fragments' centre of mass move after the explosion?
  1. Along the same parabolic trajectory the intact projectile would have followed ✓
  2. In a straight horizontal line because internal forces cancel gravity
  3. Vertically downward from the explosion point with no horizontal motion
  4. Toward the heaviest fragment because it contains most of the mass
Answer: A. Explosion forces are internal; gravity remains the same external force, so the centre of mass continues on the original parabola.
Why not B: Internal explosion forces cancel, but the external gravitational force still accelerates the centre of mass.
Why not C: The centre of mass retains the projectile's horizontal momentum at the instant of explosion.
Why not D: Individual fragment motions change, yet their mass-weighted position still obeys the external-force trajectory.

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Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Systems of Particles and Rotational Motion →

Other NEET Physics chapters

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Questions

How many NEET and JEE questions are there on Systems of Particles and Rotational Motion?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET and JEE Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.