JEE Main 2021PhysicsThermal Properties of MatterMediumMCQ

JEE Main 2021 — Thermal Properties of Matter Question with Solution

JEE Main 2021 (27 Jul Shift 1)

Question

A body takes 4 min to cool from 61°C to 59°C. If the temperature of the surroundings is 30°C, the time taken by the body to cool from 51°C to 49°C is:

Choose an option

Show full solutionCorrect option: D
Correct answer
D6 min.

Step-by-step explanation

ΔTΔt=KTt-TS Tt= average temperature

TS= surrounding temperature

61-594=K61+592-30  ...(i)

51-49t=K51+492-30  ...ii

Divide (1) and (2)

t4=60-3050-30=3020

So, t=6 min

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Thermal Properties of Matter chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

About this question

This is a previous-year question from JEE Main 2021, 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.