JEE Main 2024 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 6 April 2024, Shift 1, Physics Q56

Question 56 of 90 in this shift, Physics question 26 of 30, Section B.

If the radius of earth is reduced to three-fourth of its present value without change in its mass then value of duration of the day of earth will be __________ hours 30 minutes.

Official answer

NTA final key.

Chapter: System of Particles and Rotational Motion
Topic: Angular Momentum
Idea tested: Conservation of Angular Momentum

Same idea in other shifts

Asked 7× in all

8 Apr 2024, Shift 2 · Q35A thin circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular…EasySingle correct
10 Apr 2023, Shift 1 · Q53If the earth suddenly shrinks to $\frac{1}{64}$ th of its original volume with its mass remaining the same, the period of rotation of earth…MediumNumerical value
11 Apr 2023, Shift 2 · Q53A circular plate is rotating in horizontal plane, about an axis passing through its center and perpendicular to the plate, with an angular…MediumNumerical value
26 Jun 2022, Shift 1 · Q35A thin circular ring of mass M and radius R is rotating with a constant angular velocity 2 $\mathrm{rads^{-1}}$ in a horizontal plane…EasySingle correct
18 Mar 2021, Shift 1 · Q20A thin circular ring of mass M and radius r is rotating about its axis with an angular speed $\omega$ . Two particles having mass m each…EasySingle correct
5 Sep 2020, Shift 1 · Q4A wheel is rotating freely with an angular speed $\omega$ on a shaft. The moment of inertia of the wheel is I and the moment of inertia of…EasySingle correct

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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.