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Saturday, 31 October

JEE Main 2024 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 1 February 2024, Shift 2, Physics Q53

Question 53 of 90 in this shift, Physics question 23 of 30, Section B.

One end of a metal wire is fixed to a ceiling and a load of 2 kg hangs from the other end. A similar wire is attached to the bottom of the load and another load of 1 kg hangs from this lower wire. Then the ratio of longitudinal strain of upper wire to that of the lower wire will be ________. [Area of cross section of wire =0.005 cm2= 0.005\ \mathrm{cm^2}, Y=2×1011 Nm−2Y = 2\times10^{11}\ \mathrm{Nm^{-2}} and g=10 ms−2g = 10\ \mathrm{ms^{-2}}]

Official answer

3

NTA final key.

Chapter
Mechanical Properties of Solids
Topic
Elasticity
Idea tested
Stress and Strain Types

Same idea in other shifts

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  5. 6 Apr 2023, Shift 2 · Q53A metal block of mass m is suspended from a rigid support through a metal wire of diameter 14 mm. The tensile stress developed in the wire…EasyNumerical value
  6. 28 Jul 2022, Shift 2 · Q23A string of area of cross-section 4 mm24\ \mathrm{mm^2} and length 0.5 m is connected with a rigid body of mass 2 kg. The body is rotated in…MediumNumerical value
  7. 2 Apr 2017 (offline) · Q1A man grows into a giant such that his linear dimensions increase by a factor of 9. Assuming that his density remains same, the stress in…MediumSingle 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.