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Saturday, 31 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 4 April 2026, Shift 2, Physics Q31

Question 31 of 75 in this shift, Physics question 6 of 25, Section A.

A metal string AA is suspended from a rigid support and its free end is attached to a block of mass MM. Second block having mass 2M2M is suspended at the bottom of the first block using a string BB. The area of cross sections of strings AA and BB are same. The ratio of lengths of strings of AA to BB is 2 and the ratio of their Young's moduli (YA/YBY_A/Y_B) is 0.5. The ratio of elongations in AA to BB is ________.
  1. (1)1
  2. (2)4
  3. (3)8
  4. (4)6Official answer

Official answer

Option 4

NTA final key.

Chapter
Mechanical Properties of Solids
Topic
Elasticity
Idea tested
Series and Parallel Composite Wires

Same idea in other shifts

Asked 7× in all
  1. 4 Apr 2026, Shift 1 · Q34A string AA of length 0.3140.314 m and Young's modulus 2×1010 N/m22\times10^{10}\ \mathrm{N/m^2} is connected to another string BB of length and…MediumSingle correct
  2. 6 Apr 2026, Shift 1 · Q34The two wires AA and BB of equal cross-section but of different materials are joined together. The ratio of Young's modulus of wire AA…EasySingle correct
  3. 10 Apr 2023, Shift 1 · Q51Two wires each of radius 0.2 cm and negligible mass, one made of steel and the other made of brass are loaded as shown in the figure. The…MediumNumerical valueHas a figure
  4. 27 Jul 2022, Shift 2 · Q37A steel wire of length 3.2 m (Ys=2.0×1011Y_s=2.0\times10^{11} Nm−2^{-2}) and a copper wire of length 4.4 m (Yc=1.1×1011Y_c=1.1\times10^{11} Nm−2^{-2}), both…MediumSingle correct
  5. 30 Jul 2022, Shift 2 · Q6A block of mass M is attached to a wire. The upper part of wire is made of steel and lower part of wire of copper ( as shown in figure ).…EasySingle correctHas a figure
  6. 25 Jul 2021, Shift 1 · Q18Two wires of same length and radius are joined end to end and loaded. The Young's modulii of the materials of the two wires are Y1Y_1 and…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.