Odisha Board Solutions for Chapter: Surface Tension, Exercise 1: MODEL QUESTIONS

A liquid drop breaks into several droplets. Its surface energy

Calculate the pressure inside an air bubble of radius $0.01\mathrm{mm}$ situated at a depth of $30\mathrm{cm}$ below the free surface of a liquid of density $0.9\mathrm{kg}/{\mathrm{m}}^3$ and surface tension $72 \mathrm{dyne}/\mathrm{cm}$. Given atmospheric pressure$=76 \mathrm{cm} \mathrm{of} \mathrm{Hg}$.

A soap bubble has radius $5 \mathrm{cm}.$ If the soap solution has a surface tension $30\times {10}^{-3} \mathrm{N}/\mathrm{m},$ the gauge pressure within the bubble is _____ Pa.

When a soap bubble is charged it contracts.

If a drop of oil is placed on the surface of water, it will spread as a thin layer.

A liquid does not wet the surface of a solid if the angle of contact is an obtuse one.

Soap helps in cleaning the clothes because it reduces the surface tension of the solution.

When a drop of water breaks into two droplets of equal size, there is loss in surface energy.