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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 27 June 2022, Shift 1, Physics Q35

Question 35 of 90 in this shift, Physics question 5 of 30, Section A.

Two blocks of masses 10 kg and 30 kg are placed on the same straight line with coordinates (0,0)(0, 0) cm and (x,0)(x, 0) cm respectively. The block of 10 kg is moved on the same line through a distance of 6 cm towards the other block. The distance through which the block of 30 kg must be moved to keep the position of centre of mass of the system unchanged is :
  1. (1)4 cm towards the 10 kg block
  2. (2)2 cm away from the 10 kg block
  3. (3)2 cm towards the 10 kg blockOfficial answer
  4. (4)4 cm away from the 10 kg block

Official answer

Option 3

NTA final key.

Chapter
System of Particles and Rotational Motion
Topic
Center of Mass
Idea tested
Discrete System COM

Same idea in other shifts

Asked 5× in all
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  4. 29 Jul 2022, Shift 1 · Q36Two bodies of mass 1 kg and 3 kg have position vectors i^+2j^+k^\hat{i} + 2\hat{j} + \hat{k} and −3i^−2j^+k^-3\hat{i} - 2\hat{j} + \hat{k} respectively.…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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.