JEE Main 2025 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 7 April 2025, Shift 1, Physics Q30

Question 30 of 75 in this shift, Physics question 5 of 25, Section A.

A cubic block of mass m is sliding down on an inclined plane at

60^\circ

with an acceleration of

\frac{g}{2}

, the value of coefficient of kinetic friction is

(1) $\frac{\sqrt{3}}{2}$
(2) $1 - \frac{\sqrt{3}}{2}$
(3) $\frac{\sqrt{2}}{3}$
(4) $\sqrt{3} - 1$ Official answer

Official answer

Option 4

NTA final key.

Chapter: Laws of Motion
Topic: Friction
Idea tested: Friction on Inclines

Same idea in other shifts

Asked 3× in all

31 Jan 2024, Shift 1 · Q34In the given arrangement of a doubly inclined plane two blocks of masses $M$ and $m$ are placed. The blocks are connected by a light…MediumSingle correctHas a figure
24 Feb 2021, Shift 1 · Q25An inclined plane is bent in such a way that the vertical cross-section is given by $y=\frac{x^{2}}{4}$ where $y$ is in vertical and $x$ …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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.