JEE Main 2024PhysicsMechanical Properties of FluidsEasyMCQ

JEE Main 2024 — Mechanical Properties of Fluids Question with Solution

JEE Main 2024 (31 Jan Shift 2)

Question

A small spherical ball of radius r, falling through a viscous medium of negligible density has terminal velocity v. Another ball of the same mass but of radius 2r, falling through the same viscous medium will have terminal velocity:

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Show full solutionCorrect option: A
Correct answer
Av2

Step-by-step explanation

Ignoring buoyancy force, we can write terminal velocity as 

mg=6πηrv

⇒v∝1r (as mass is constant)

Now, vv'=r'r

As r'=2r

So v'=v2

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About this question

This is a previous-year question from JEE Main 2024, covering the Mechanical Properties of Fluids 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.