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Friday, 9 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 topic in other shifts

All Newton's Laws of Motion questions
  1. 4 Apr 2026, Shift 2 · Q28At t=0t=0, a body of mass 100 g starts moving under the influence of a force (5i^+10j^)\left(5\hat i+10\hat j\right) N. After 2 s its position is…EasySingle correct
  2. 5 Apr 2026, Shift 1 · Q29Three masses m1=4m_1 = 4 kg, m2=4m_2 = 4 kg and m3=6m_3 = 6 kg are suspended from a fixed smooth frictionless pulley as shown in the figure…MediumSingle correctHas a figure
  3. 5 Apr 2026, Shift 1 · Q30A wedge YY with mass of 10 kg and all frictionless surfaces and the inclined surface making 37∘37^\circ with horizontal. A block XX with…HardSingle correctHas a figure
  4. 2 Apr 2025, Shift 2 · Q29A body of mass 1 kg is suspended with the help of two strings making angles as shown in figure. Magnitudes of tensions T1T_1 and T2T_2,…EasySingle correctHas a figure
  5. 7 Apr 2025, Shift 2 · Q28An object with mass 500 g moves along xx-axis with speed v=4xv=4\sqrt{x} m/s. The force acting on the object is :MediumSingle correct
  6. 8 Apr 2025, Shift 2 · Q27A body of mass 2 kg moving with velocity of v⃗in=3i^+4j^ ms−1\vec{v}_{in} = 3\hat{i} + 4\hat{j}\ \mathrm{ms^{-1}} enters into a constant force field 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. 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.