NEET PhysicsNCERT Class 11Rotational Motion

System of Particles and Rotational Motion: NEET questions with solutions

NEET uses this chapter for the centre of mass of point masses, torque as r × F, the principle of moments, τ = Iα with standard moments of inertia, rotational kinematics, and conservation of angular momentum. Marks are lost by using r instead of the perpendicular distance, leaving rpm unconverted, and assuming kinetic energy is conserved whenever angular momentum is.

Revise first: NCERT notes for System of Particles and Rotational Motion

Questions

10 questions · answers after you pick

1A 2 kg particle sits at x = 0 and a 3 kg particle at x = 5 m on the x-axis. Where is the centre of mass of the pair?Centre of massEasySingle correct 2A force of 20 N is applied at the free end of a 0.50 m spanner, at an angle of 30° to the length of the spanner, in the plane of rotation.…Torque and angular momentumEasySingle correct 3A metre stick is easy to twirl about its own length but hard to swing about an axis through its middle at right angles. Judge the Assertion…Moment of inertiaEasyAssertion–Reason 4A grinding wheel spinning at 600 rpm is switched off and comes to rest in 10 s with uniform angular deceleration. How many revolutions does…Kinematics of rotationMediumSingle correct 5A skater spins at 1.5 rev s⁻¹ with arms outstretched, when her moment of inertia about the vertical axis is 4.0 kg m². She pulls her arms…Angular momentum and its conservationMediumSingle correct 6A uniform solid disc of mass 4.0 kg and radius 0.50 m can turn freely about a fixed horizontal axle through its centre. A light string wound…Dynamics of rotationMediumSingle correct 7A shell flying along a parabolic path explodes in mid-air into several fragments. Air resistance is negligible. Consider statements I to IV…Motion of the centre of massMediumStatement based 8A uniform rod 1.00 m long with mass 400 g is pivoted at its 40 cm mark. What mass must be hung at the 20 cm mark to keep the rod horizontal?Principle of moments and centre of gravityMediumSingle correct 9A force F = (î − ĵ + k̂) N acts at a point whose position vector relative to the origin is r = (2î + 3ĵ) m. The torque of the force about…Vector product of two vectorsHardSingle correct 10A disc with moment of inertia I spins freely at ω₀ about a frictionless vertical axle. A second disc, at rest and with moment of inertia 2I…Angular momentum and its conservationHardSingle correct

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