Area of liquid film is $6\times 10c{m}^2$ and surface tension is $T=20dyne/cm$, what is the work done to change area up to $12\times 10c{m}^2$:

When raindrops fall on a red-brick wall after dry and hot weather, hissing sounds are produced. Explain the phenomenon.

A rectangular film of liquid is extended from $(4cm\times 2cm)$ to $(5cm\times 4cm)$. If the work done is 3\times 10^{-4}J$$, the value of the surface tension of the liquid is

Explain why the free surface of some liquids in contact with a solid is not horizontal.

The following observation were taken for detrmining surface tension T of water by capillary rise method. Diameter of the capillary is $D=1.25\times {10}^{-2}m$
rise of water, $h=1.45\times {10}^{-2}m$
Using $g=9.80m/s^2$ and the simplified relation $T=\frac{rhg}{2}\times {10}^{3}N/m$, the possible error in T=(rhg2)103 N/m, the possible percentage error in surface tension is closest to :

The length of one edge of a glass plate of thickness 0.2 cm is 9.8 cm. If this edge of the glass plate touches the surface of a liquid of surface tension 60 dyne/cm, then it ispulled down with a force of (Assume that angle of contact to be zero)

A large tank is filled with water ( density$=10^{3}kg/m^3$ ) . a small hole is made at a depth 10m below the water surface the range of water issuing out of the hole is R on the ground. what extra pressure applied on water surface so that the range becomes 2R ( take 1 atm$=10^{5}Pa,g=10m/s^2$)

If the surface tension of a liquid is T and its surface are is increased by A, then the surface energy of that surface will be increased by :-

An iron needle sinks in water as its density is less than 1 $g/c{m}^3$.