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Saturday, 31 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 28 June 2022, Shift 1, Physics Q57

Question 57 of 90 in this shift, Physics question 27 of 30, Section B.

A hanging mass M is connected to a four times bigger mass by using a string-pulley arrangement, as shown in the figure. The bigger mass is placed on a horizontal ice-slab and being pulled by 2 Mg force. In this situation, tension in the string is x5\frac{x}{5} Mg for x = ____________. Neglect mass of the string and friction of the block (bigger mass) with ice slab. (Given g = acceleration due to gravity)

The figure, in words

A block of mass 4M on a horizontal ice slab, pulled to the left by a force labelled 2Mg; a string from the block goes over a pulley at the right edge of the slab to a hanging mass M.

Official answer

6

NTA final key.

Chapter
Laws of Motion
Topic
Newton's Laws of Motion
Idea tested
Ideal String Tension

Same idea in other shifts

Asked 3× in all
  1. 5 Apr 2024, Shift 1 · Q52Three blocks M1M_1, M2M_2, M3M_3 having masses 4 kg, 6 kg and 10 kg respectively are hanging from a smooth pulley using rope 1, 2 and 3 as…MediumNumerical valueHas a figure
  2. 30 Jan 2024, Shift 2 · Q33Three blocks AA, BB and CC are pulled on a horizontal smooth surface by a force of 80N80N as shown in figure The tensions T1T_1 and…EasySingle 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 108 of the 174 JEE Main shifts held from 2017 to 2026.