JEE Main 2015PhysicsMechanical Properties of FluidsMediumMCQ

JEE Main 2015 — Mechanical Properties of Fluids Question with Solution

JEE Main 2015 (10 Apr Online)

Question

If it takes 5 minutes to fill a 15 litre bucket from a water tap of diameter 2π cm then the Reynolds number for the flow is (density of water = 103  kg/m3 and viscosity of water=10-3 Pa.s ) close to:

Choose an option

Show full solutionCorrect option: A
Correct answer
A5500

Step-by-step explanation

Reynolds number

R=ρvDη

D =  Diameter of litre

Also rate of flow = volumetime=A v

Vt= π D24×v ⇒v=4VπD2t

∴    R= ρ Dη×4 Vπ D2 t

=4 ρ Vπ η D t

=4×103×15×10-3π×10-3×2×5×60 π×102

=10000π ≈5500

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Mechanical Properties of Fluids 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 2015, 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.