Surface Tension...

The radius of a soap bubble is increased from R to 2 R. Work done in this process (T = surface tension) is

A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then

At which of the following temperatures, the value of surface tension of water is minimum ?

If a glass rod is dipped in mercury and withdrawn out, the mercury does not wet the rod because 

Mercury does not wet glass, wood or iron because

Surface tension of a liquid is found to be influenced by

When a drop of water is dropped on oil surface, then :

Small liquid drops assume spherical shape because

It is easy to wash clothes in hot water because its

The force required to separate two glass plates of area 10⁻²m² with a film of water 0.05 mm thick between them, is (Surface tension of water is 70×10⁻³ N/m)