Embibe Experts Solutions for Exercise 3: Assignment

Soap helps in cleaning clothes, because

On increasing temperature of a liquid, its surface tension generally

An iron needle slowly placed on the surface of water floats because

Two water droplets merge with each other to form a large droplet. In this process

The radius of a soap bubble is $r.$ The surface tension of soap solution is $\text{'}S\text{'}.$ Keeping temperature constant, the radius of the soap bubble is doubled. The energy necessary for this will be

The kerosene oil rises up in the wick of a lamp

A capillary tube of radius $r$ is immersed in a liquid and mass of liquid, which rises up in it is $M.$ If the radius of tube is doubled, then the mass of liquid which will rise in capillary tube will be

The height of mercury in the barometer tube is $70 \mathrm{cm}$ due to entrapped air in it as shown in figure. Now from this position tube is pulled up slightly, then length of the mercury column in the tube will