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Saturday, 31 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctHardMulti-step

JEE Main 6 April 2026, Shift 1, Physics Q29

Question 29 of 75 in this shift, Physics question 4 of 25, Section A.

Two blocks (PP and QQ) with respectively masses 2 kg and 1.5 kg are joined by a massless thread. These blocks are mounted on a frictionless pulley which is fixed on the edge of a cube (SS), as shown in the figure below. Block PP is positioned on the top surface which has no friction and block QQ is in contact with side-surface, having coefficient friction μ\mu. The cube (SS) moves towards the right with acceleration of g2\frac{g}{2}, where gg is gravitational acceleration. During this movement the block PP and QQ remain stationary. The value of μ\mu is ________. (take g=10g=10 m/s2^2)

The figure, in words

Cube S with a frictionless pulley at its top right edge; block P (2 kg) rests on the top surface joined by a thread over the pulley to block Q (1.5 kg) hanging against the right side surface.
  1. (1)0.33
  2. (2)0.67Official answer
  3. (3)1
  4. (4)0.5

Official answer

Option 2

NTA final key.

Chapter
Laws of Motion
Topic
Newton's Laws of Motion
Idea tested
Pseudo Force Application

Same idea in other shifts

Asked 2× in all
  1. 31 Aug 2021, Shift 1 · Q23A car is moving on a plane inclined at 30∘30^\circ to the horizontal with an acceleration of 10 ms−2^{-2} parallel to the plane upward. A…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 108 of the 174 JEE Main shifts held from 2017 to 2026.