Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Surface Tension, Exercise 2: Critical Thinking

Water rises to a height of $2\mathrm{cm}$ in a capillary tube. If the tube is tilted $60°$ from the vertical, water will rise in the tube to a length

A capillary tube when immersed vertically in a liquid records a rise of $6\mathrm{cm}$. If the tube is immersed inclined $30°$ with the vertical, then length of liquid column along the tube will be

Two tubes of same material but of different radii are dipped in a liquid. The height to which a liquid rises in one tube is $2.2\mathrm{cm}$ and in the other is $6.6\mathrm{cm}.$ The ratio of their radii is

There is a small hole in a hollow sphere. Water enters in it. When it is taken to a depth of $40\mathrm{cm}$ under water, the surface tension of water is $0.07\mathrm{N}/\mathrm{m}$. The diameter of the hole is

The excess pressure inside a soap bubble is twice the excess pressure inside a second soap bubble. The volume of the first bubble is $n$ times the volume of the second; where $n$ is

The surface tension of water is $7\times {10}^{-2} \mathrm{N} {\mathrm{m}}^{-1}$. The work required to break a drop of water of radius $0.5 \mathrm{cm}$ into identical drops, each of radius $1 \mathrm{mm}$ is

If a million tiny droplets of water of the same radius coalesce into one larger drop, then the ratio of the surface energy of the large drop to the total surface energy of all the droplets will be

A small air bubble of radius $0.1 \mathrm{mm}$ is situated at a depth of $20 \mathrm{m}$ below the free surface of the water. The external pressure on the bubble will be (atmospheric pressure $={10}^5 \mathrm{N} {\mathrm{m}}^{-2}, g=10 \mathrm{m} {\mathrm{s}}^{-2}$ and surface tension of water is$=72\times {10}^{-3} \mathrm{N} {\mathrm{m}}^{-1}$)