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Friday, 9 October

JEE Main 2026 · PhysicsMultiple choiceDiagram basedMediumMulti-step

JEE Main 4 April 2026, Shift 2, Physics Q35

Question 35 of 75 in this shift, Physics question 10 of 25, Section A.

A uniform disc of radius RR and mass MM is free to oscillate about the axis AA as shown in the figure. For small oscillations the time period is ________. (g is acceleration due to gravity)

The figure, in words

Uniform disc of radius R and mass M (centre marked, radius R drawn); axis A is a horizontal line tangent to the disc at its top point A, about which the disc oscillates (rotation arrow shown); M labelled at the bottom.
  1. (1)2π5R4g2\pi\sqrt{\frac{5R}{4g}}Official answer
  2. (2)2π2R3g2\pi\sqrt{\frac{2R}{3g}}
  3. (3)2π3R2g2\pi\sqrt{\frac{3R}{2g}}
  4. (4)2π3Rg2\pi\sqrt{\frac{3R}{g}}

Official answer

Option 1

NTA final key.

Chapter
Oscillations
Topic
Pendulums
Idea tested
Physical Pendulum Period

Same topic in other shifts

All Pendulums questions
  1. 30 Jan 2024, Shift 2 · Q60A simple pendulum is placed at a place where its distance from the earth's surface is equal to the radius of the earth. If the length of…MediumNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.