Drops of liquid of density are floating half immersed in a liquid of density .  If the surface tension of the liquid is T, then the radius of drop will be :

PQRS is a rectangular frame of copper wire shown in figure. The side RS of the frame is movable.  If a soap film is formed on it then the diameter of the wire to maintain equilibrium will be (given surface tension of soap solution=0.045 N/m and density of copper = 8.96 x 10³ kg/m³  ). 

A water fountain on the ground sprinkles water all around it.  If the speed of water coming out of the fountain is v, the total area around the fountain that gets wet is

Work done to blow a bubble of volume V is W.  The work done in blowing a bubble of volume 2V will be :

Motion of a liquid in a tube is best described by

A bubble is at the bottom of the lake of depth h.  As the bubble comes to sea level, its radius increases three times.  If atmospheric pressure is equal to l metre of water column, then h is equal to

The rate of flow of liquids in a tube of radius r, length l, whose ends are maintained at a pressure difference P is

where η is coefficient of viscosity and Q is

A 20 cm long capillary tube is dipped in water.  The water rises up to 8 cm.  If the entire arrangement is put in a freely falling elevator the length of water column in the capillary tube will be

A man is sitting in a boat, which is floating on a pond.  If the man drinks some water from the pond, the level of water in the pond.

The potential energy possessed by a soap bubble, having surface tension equal to 0.04 Nm^-1 of diameter 1 cm, is