JEE Main 2021 — Rotational Motion Question with Solution
From: JEE Main 2021 (Online) 26th August Evening Shift
Question
The solid cylinder of length 80 cm and mass M has a radius of 20 cm. Calculate the density of the material used if the moment of inertia of the cylinder about an axis CD parallel to AB as shown in figure is 2.7 kg m2.
This question includes a diagram. The text above accompanies the figure.
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Show full solutionCorrect option: D
Correct answer
D1.49 102 kg/m3
Step-by-step explanation
Parallel axis theorem
I = ICM + Md2
M = 15 kg
= 0.1492 103
I = ICM + Md2
M = 15 kg
= 0.1492 103
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This is a previous-year question from JEE Main 2021, covering the Rotational Motion chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.