6.An ice cube containing a piece of lead floats in water. What would be the effect on the level of water if the ice cube melts ?

7.If two soap bubbles of different radii are connected by a tube:

8.The ratio of the diameter of an air bubble at the bottom and at the surface is 1 : 2. If 1 atmosphere is equal to pressure of 10 m long water column, then the depth of the lake is

9.A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in m/s) through a small hole on the side wall of the cylinder near its bottom is:

10.The weight of a wooden block of size 8 * 8 * 8 cm is 307.2 g . When it is floating in water, the height of the wooden block above water level is