JEE Main 2019PhysicsMechanical Properties of FluidsEasyMCQ

JEE Main 2019 — Mechanical Properties of Fluids Question with Solution

JEE Main 2019 (09 Jan Shift 2)

Question

The top of a water tank is open to air and its water level is maintained. It is giving out 0.74 m3 water per minute through a circular opening of 2 cm radius in its wall. The depth of the centre of the opening from the level of water in the tank is close to:

Choose an option

Show full solutionCorrect option: B
Correct answer
B4.8 m

Step-by-step explanation

Volume of water flowing out=Av, where A is area of opening and v is speed of water from the opening.

Volume=πr2v

0.74  m3min=3.14×2×10-22×2×10×H m3s×60 smin

⇒H=0.7460×3.14×4×10-42×120

⇒H=4.8 m

Hence, the height of water in the tank was 4.8 m from the bottom of the tank.

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 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.