JEE Main 2019PhysicsMechanical Properties of FluidsMediumMCQ

JEE Main 2019 — Mechanical Properties of Fluids Question with Solution

JEE Main 2019 (08 Apr Shift 1)

Question

Water from a pipe is coming at a rate of 100 liters per minute. If the radius of the pipe is 5 cm, the Reynolds number for the flow is of the order of: (density of water = 100 kg/m3, coefficient of viscosity of water =1 mPa s)

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Show full solutionCorrect option: B
Correct answer
B104

Step-by-step explanation

Volume flow rate =πr2v=100 lmin
⇒πr2v=1600 m3/sec
⇒v=1600 πr2 m/sec
Reynolds number Re=ρvDη
=10001×10-3×1600 πr2×2r
=20000.6π5×10-2=21220.66=2.1×104

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About this question

This is a previous-year question from JEE Main 2019, 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.