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Friday, 9 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 4 April 2026, Shift 2, Physics Q34

Question 34 of 75 in this shift, Physics question 9 of 25, Section A.

The temperature of a metal strip having coefficient of linear expansion α\alpha is increased from T1T_1 to T2T_2 resulting in increase of its length by ΔL1\Delta L_1. The temperature is further increased from T2T_2 to T3T_3 such that the increase in its length is ΔL2\Delta L_2. Given T3+T1=2T2T_3+T_1=2T_2 and T2−T1=ΔTT_2-T_1=\Delta T, the value of ΔL2\Delta L_2 is ________.
  1. (1)ΔL1[1+2α2(ΔT)2]\Delta L_1\left[1+2\alpha^2(\Delta T)^2\right]
  2. (2)ΔL1[1+α2(ΔT)2]\Delta L_1\left[1+\alpha^2(\Delta T)^2\right]
  3. (3)ΔL1[1+2αΔT]\Delta L_1\left[1+2\alpha\Delta T\right]
  4. (4)ΔL1[1+αΔT]\Delta L_1\left[1+\alpha\Delta T\right]Official answer

Official answer

Option 4

NTA final key.

Chapter
Thermal Properties of Matter
Topic
Thermal Expansion
Idea tested
Linear Expansion

Same topic in other shifts

All Thermal Expansion questions
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  2. 4 Apr 2025, Shift 2 · Q31Consider a rectangular sheet of solid material of length l=9l=9 cm and width d=4d=4 cm. The coefficient of linear expansion is…MediumSingle correct
  3. 8 Apr 2023, Shift 2 · Q52A steel rod of length 1 m and cross sectional area 10−410^{-4} m2^2 is heated from 0∘0^\circC to 200∘200^\circC without being allowed to…EasyNumerical value
  4. 25 Jul 2022, Shift 1 · Q54A unit scale is to be prepared whose length does not change with temperature and remains 2020 cm, using a bimetallic strip made of brass…EasyNumerical value
  5. 16 Mar 2021, Shift 2 · Q13A bimetallic strip consists of metals A and B. It is mounted rigidly as shown. The metal A has higher coefficient of expansion compared to…EasyDiagram basedHas a figure
  6. 2 Apr 2017 (offline) · Q9An external pressure P is applied on a cube at 0°C so that it is equally compressed from all sides. K is the bulk modulus of the material…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 42 of the 174 JEE Main shifts held from 2017 to 2026.