Fluid Mechanics

JEE Main level, single correct, medium

120 of 192

Question 120 of 192

The height of liquid column raised in a capillary tube of certain radius when dipped in liquid AA vertically is, 5cm5cm. If the tube is dipped in a similar manner in another liquid BB of surface tension and density double the values of liquid AA, the height of liquid column raised in liquid B would be ______ mm.

Show answer and solution

Answer: (C) 0.050.05

The height hh through which a liquid will rise in a capillary tube of radius rr is given by,
h=2Tcos⁡θrρg∝Tρ∝2T2ρh=\dfrac{2T\cos \theta }{r\rho g}\propto \dfrac{T}{\rho }\propto \dfrac{2T}{2\rho }
As we can see in both cases, value of height will remain same. Therefore,
h′=h=5cm=0.05m{h}^{'}=h=5cm=0.05m

JEE Main question paper PDF

Open a shift to read the full paper on this page, or download it.

JEE Main 2025 Apr 2 Shift 1 question paper

Open Download PDF

Opening paper…

Explain it as a whiteboard videoStep-by-step, in Hinglish or English. Your first video needs no login.Solved it on paper but got it wrong?Upload a photo of your working. Mistake Doctor marks the exact line that broke.
See it move: Fluid mechanics simulationDrag the sliders and watch the numbers in this question change.

More Physics practice

JEE Main Physics practice question on Fluid Mechanics (Surface tension), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.