Water rises in a capillary tube upto a height of 10 cm whereas mercury depresses in it by 3.42 cm.  If the angle of contact and density of mercury are 135^o and 13.6 gm/cc respectively, then the ratio of the surface tension of water and mercury 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 radii of two soap bubbles are R₁ and R₂ .  If they coaleasce, the radius of curvature of the common surface will be :

In old age arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure.  This follows from

Water from a tap emerges vertically downwards with an initial speed of 1.0 ms^-1 .  The cross-sectional area of the tap is 10^-4 m².  Assume that the pressure is constant throughout the stream of water, and that the flow is steady.  The cross-sectional area of the stream 0.15 m below the tap is

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

When the temperature is increased, the angle of contact of a liquid

There is a small hole in a hollow sphere.  The water enters in it when it is taken to a depth of 40 cm under water.  The surface tension of water is The diameter of hole is :

Two capillaries of lengths L and 2 L and of radii R and 2 R respectively are connected in series.  The net rate of flow of fluid through them will (Given, rate of the flow through single capillary, ) be

n small drops of radius r, combine to form a bigger drop of the radius R.  If the energy evolved provides K.E to the drop then the speed of the drop will be (density of drop = d and surface tension of liquid = T)