JEE Main 2026 — Thermal Properties of Matter Question with Solution
JEE Main 2026 (21 January Shift 1)
Question
An aluminium and steel rods having same lengths and cross-sections are joined to make total length of 120 cm at . The coefficient of linear expansion of aluminium and steel are and , respectively. The length of this composite rod when its temperature is raised to , is cm.
Choose an option
Show full solutionCorrect option: B
Correct answer
B120.15
Step-by-step explanation
Total length at 30°C = 120 cm, each rod = 60 cm
/°C, /°C
°C
cm
cm
Total expansion cm
Final length cm
/°C, /°C
°C
cm
cm
Total expansion cm
Final length cm
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This is a previous-year question from JEE Main 2026, covering the Thermal Properties of Matter chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.