AktiraAktira JEE
Subscribe
PhysicsJEE Main 21 Jan 2026, Shift 1·Q15·MCQ·Easy–moderate

Thermal Properties of Matter · Temperature and expansion

Aluminium and steel rods having same lengths and cross-sections are joined to make total length of 120 cm at 30∘30^\circC. The coefficients of linear expansion of aluminium and steel are 24×10−6/∘24\times10^{-6}/^\circC and 1.2×10−5/∘1.2\times10^{-5}/^\circC, respectively. The length of this composite rod when its temperature is raised to 100∘100^\circC, is cm.
  1. (1)120.20
  2. (2)120.15
  3. (3)120.03
  4. (4)120.06
We corrected a printing error in the original paper

Source printed “An aluminium and steel rods” and “The coefficient of linear expansion … are”.

Video solution coming soon

We're animating every PYQ step by step. Subscribe to get them first.

Subscribe

See the full 21 Jan 2026, Shift 1 paper

More on Temperature and expansion