A thin liquid film formed between a U-shaped wire and a light slider supports a weight of $1.5 imes 10^{-2}$ N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is:

Two capillary tubes of radii 0.2 mm and 0.4 mm are dipped vertically in water. The difference in the heights of the water level in the two tubes is $h_1$. If the two tubes are dipped in a liquid of surface tension $\frac{2}{3}$ that of water and density twice that of water, the difference in height of the liquid in the two tubes is $h_2$. The ratio $\frac{h_1}{h_2}$ is:

A spherical drop of water has radius 1 mm if surface tension of water is $70 imes {10^{ - 3}}{\rm{N}}{{\rm{m}}^{ - 1}}$, difference of pressure between inside and outside of the spherical drop is

Two liquid drops have diameters of 1 cm and 1.5 cm. The ratio of excess of pressure inside them is

The radius of a soap bubble is increased from $\frac{1}{{\sqrt \pi }}\,cm\,\,to\,\,\frac{2}{{\sqrt \pi }}\,\,cm$. If the surface tension of water is 30 dynes per cm, then the work done will be

What is the ratio of surface energy of 1 small drop and 1 large drop if 1000 drops combined to form 1 large drop?

The surface energy of a liquid drop is $u$. It is sprayed into 1000 equal droplets. Then its surface energy becomes

The capillary rise of a liquid in a tube depends upon:

A mercury drop of radius 1 cm is broken into ${10^6}$ droplets of equal size. The work done is $\left( {S = 35 imes {{10}^{ - 2}}{\rm{N}}{{\rm{m}}^{ - 1}}} \right)$

A liquid rises to a height h in a capillary tube of radius r. If the angle of contact is $heta$, which of the following correctly expresses the surface tension of the liquid?

A capillary tube of radius $r$ is immersed in water, and water rises in it to a height $h$. The mass of the water in the capillary is $5g$. Another capillary tube of radius $3r$ is immersed in water. The mass of water that will rise in this tube is: