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Friday, 9 October

JEE Main 2024 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 31 January 2024, Shift 2, Physics Q34

Question 34 of 90 in this shift, Physics question 4 of 30, Section A. NTA dropped this question from the final key; it is left out of every count on this site.

A block of mass 5 kg is placed on a rough inclined surface as shown in the figure. If F1⃗\vec{F_1} is the force required to just move the block up the inclined plane and F2⃗\vec{F_2} is the force required to just prevent the block from sliding down, then the value of ∣F1⃗∣−∣F2⃗∣|\vec{F_1}|-|\vec{F_2}| is: [Use g = 10 m/s2^2]

The figure, in words

Right-triangle inclined plane at 30 degrees to the horizontal; a 5 kg block rests on the incline surface with coefficient of friction mu = 0.1.
  1. (1)532\frac{5\sqrt{3}}{2} N
  2. (2)1010 N
  3. (3)25325\sqrt{3} N
  4. (4)50350\sqrt{3} N

Official answer

Dropped by NTA (marks given to all)

NTA final key.

Chapter
Laws of Motion
Topic
Friction
Idea tested
Friction on Inclines

Same idea in other shifts

Asked 2× in all
  1. 7 Apr 2025, Shift 1 · Q30A cubic block of mass m is sliding down on an inclined plane at 60∘60^\circ with an acceleration of g2\frac{g}{2}, the value of coefficient…EasySingle correct
  2. 31 Jan 2024, Shift 1 · Q34In the given arrangement of a doubly inclined plane two blocks of masses MM and mm are placed. The blocks are connected by a light…MediumSingle correctHas a figure

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.