JEE Main 2020PhysicsThermal Properties of MatterMediumMCQ

JEE Main 2020 — Thermal Properties of Matter Question with Solution

JEE Main 2020 (02 Sep Shift 2)

Question

When the temperature of a metal wire is increased from 0ºC to 10ºC, its length increases by 0.02%.The percentage change in its mass density will be closed to:

Choose an option

Show full solutionCorrect option: A
Correct answer
A0.06

Step-by-step explanation

Δℓ=ℓαΔt
α=ΔℓℓΔT=0.02100×10;  α=2×10-5
γ=3α=6×10-5
ΔVV=γ×ΔT;  ΔVV×100=6×10-5×10×100=6×10-2
Volume increase by 0.06% therefore density decrease by 0.06%

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About this question

This is a previous-year question from JEE Main 2020, 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.