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Friday, 9 October

JEE Main 2020 · PhysicsMultiple choiceDiagram basedEasyCalculation

JEE Main 2 September 2020, Shift 1, Physics Q7

Question 7 of 75 in this shift, Physics question 7 of 25.

Shown in the figure is rigid and uniform one meter long rod ABAB held in horizontal position by two strings tied to its ends and attached to the ceiling. The rod is of mass 'm' and has another weight of mass 2m2m hung at a distance of 75 cm from A. The tension in the string at A is :

The figure, in words

Horizontal metre rod AB (scale marks 0, 25, 50, 75, 100) hung by vertical strings at A (0) and B (100) from the ceiling; a block of mass 2m hangs from the 75 cm mark.
  1. (1)2 mg2\ mg
  2. (2)0.5 mg0.5\ mg
  3. (3)0.75 mg0.75\ mg
  4. (4)1 mg1\ mgOfficial answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
System of Particles and Rotational Motion
Topic
Torque and Equilibrium
Idea tested
Rotational Equilibrium

Same idea in other shifts

Asked 2× in all
  1. 9 Apr 2024, Shift 1 · Q33A heavy iron bar, of weight W is having its one end on the ground and the other on the shoulder of a person. The bar makes an angle…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.