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

One large soap bubble of diameter D breaks into 27 bubbles having surface tension T.  The change in surface energy is

A metallic wire of density p floats horizontal in water.  The maximum radius of the wire so that the wire may not sink, will be (consider surface tension of water = T);

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 drop of water of volume 0.05 cm³  is pressed between two glass plates, as a consequence of which spreads and occupies an area of 40 cm² .  If the surface tension of water is 70 dyne/cm, then the normal force required to separate out the two glass plates will be :

Motion of a liquid in a tube is best described by

If for gas, R/C_v =0.67, this gas is made up of molecules which are 

A jar is filled with two non-mixing liquids 1 and 2 having densities ρ₁ and ρ₂ respectively.

A solid ball, made of a material of density ρ₃ , is dropped in the jar.  It comes to equilibrium in the position shown in the figure.  Which of the following is true for ρ₁ and ρ₂ and ρ₃ ?

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

From the following figures, the correct observation is