Download App

9.2 , surface tension — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics9.2 , surface tension1 Mark
MCQ
Along capillary tyube of radius $ ‘r’$ is initially just vertically completely imerged inside a liquid of angle of contact $0^o $. If the tube is slowly raised then relation between radius of curvature of of miniscus inside the capillary tube and displacement $(h)$ of tube can be represented by
  • A

  • ✓

  • C

  • D

✓

Answer

Correct option: B.

b
The curvature equation relating the radius of meniscus inside the capillary tube and the displacement of the tube is given by,

$H=\frac{1}{2} \times\left(\frac{1}{R_{1}}+\frac{1}{R_{2}}\right)$

For a hemispherical, meniscus (which is the case for $0^{\circ}$ contact angle liquid,

$R_{1}=R_{2}=r$

Substituting the values in the equation,

$\mathrm{H}=\frac{1}{r}$

Thus, the graph should resemble a hyperbolic parabola with a value r at a displacement

$\mathrm{h}$

Hence, option $B$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 9.2 , surface tension→9.2 , surface tension — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Two inclined frictionless tracks, one gradual and the other steep meet at a from where two stones are allowed to slide down from rest, one on each track as shown in which of the following statement is correct?
Image
→
Considere the thermodynamics cycle shown on $PV$ diagram. The process $A \rightarrow B$ is isobaric, $B \rightarrow C$ is isochoric and $C \rightarrow A$ is a straight line process. The following internal energy and heat are given $: \Delta U_{A \rightarrow B} = + 400\,\, kJ$ and $Q_{B \rightarrow C} = - 500\,\, kJ$ The heat flow in the process $Q_{C \rightarrow A}$ is  ...... $kJ$
→
Latent heat of ice is:
→
A massless rod of length $L$ is suspended by two identical strings $AB$ and $CD$ of equal length. A block of mass $m$ is suspended from point $O$ such that $BO$ is equal to $‘x’$. Further it is observed that the frequency of $1^{st}$ harmonic in $AB$ is equal to $2^{nd}$ harmonic frequency in $CD$. $‘x’$ is
→
The equation of a projectile is $y=\sqrt{3} x-\frac{ x^2}{2}$, the velocity of projection is
→
Temperature remaining constant, the pressure of gas is decreased by $20\%$. The percentage change in volume:
→
The unit of the coefficient of viscosity in $S.I.$ system is
→
A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by $1\,m/s$ so as to have same K.E. as that of the boy. The original speed of the man will be
→
A device used to measure very high temperature is
→
Elasticity of a material can be altered by:
→