Three liquids of densities ${\rho }_1,$ ${\rho }_2$ $and$ $$ ${\rho }_3$ (with ${\rho }_1>{\rho }_2>{\rho }_3$), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact ${\theta }_1,{\theta }_2$ $and$ ${\theta }_3$ obey:

Water rises to a height h in capillary tube . If the length of capillary tube above the surface of water is made less than h, then

(1) water rises upto the tip of capillary tube and then starts overflowing like a fountain

(2) water rises upto the top of capillary tube and stays there without overflowing

(3) water rises upto a point a little below the top and stays there

(4) water does not rise at all

The rate of steady volume flow of water through a capillary tube of length 'l' and radius 'r' under a pressure difference of P is V. This tube is connected with another tube of the same length but half the radius in series. Then the rate of steady volume flow through them is (The pressure difference across the combination is P)

(1) $\frac{\mathrm{V}}{16}$                                     

(2) $\frac{\mathrm{V}}{17}$

(3) $\frac{16\mathrm{V}}{17}$                                   

(4) $\frac{17\mathrm{V}}{16}$

A liquid does not wet the sides of a solid if the angle of contact is

(1) Zero                                     

(2) Obtuse (More than 90°)

(3) Acute (Less than 90°)           

(4) 90°

The meniscus of mercury in the capillary tube is

(1) Convex           

(2) Concave

(3) Plane               

(4) Uncertain

The liquid meniscus in the capillary tube will be convex if the angle of contact is

(1) Greater than 90°

(2) Less than 90°

(3) Equal to 90°

(4) Equal to 0°

If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of the container is -

(1) Acute angle

(2) Obtuse angle

(3) 90°

(4) 0°

A long cylindrical glass vessel has a small hole of radius 'r' at its bottom. The depth to which the vessel can be lowered vertically in the deep water bath (surface tension T) without any water entering inside is

(1) $4\mathrm{T}/\mathrm{r\rho g}$

(2) $3\mathrm{T}/\mathrm{r\rho g}$

(3) $2\mathrm{T}/\mathrm{r\rho g}$

(4) $\mathrm{T}/\mathrm{r\rho g}$

In capillary tube, pressure below the curved surface of water will be 

(1) Equal to atmospheric

(2) Equal to upper side pressure

(3) More than upper side pressure

(4) Lesser than upper side pressure

Due to capillary action, a liquid will rise in a tube, if the angle of contact is 

(1) Acute

(2) Obtuse

(3) 90°

(4) Zero