Two capillaries of some materials are dipped into a liquid. If the height of liquid risen in them are 2.2 cm and 6.6 cm then the ratio of their radii is
3 : 1
1 : 3
9 : 1
1
Two drops of equal radius coalesce to form a bigger drop. What is ratio of surface energy of bigger drop to smaller one ?
21/2 : 1
1 : 1
22/3 : 1
none of these
The radii of two drops are in the ratio of 3 : 2, their terminal velocities are in the ratio
9 : 4
2 : 3
3 : 2
2 : 9
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
5.0×10-4 m2
1.0×10-5 m2
5.0×10-5 m2
2.0×10-5 m2
When the temperature is increased, the angle of contact of a liquid
increases
decreases
remains the same
first increases and then decreases
A 15 cm x 6 cm x 0.1 cm slide suspended with its longest side vertical. 10% part of this slide is dipped into the water. In this state its apparent weight is equal to its real weight. The surface tension of water will be :
72.3 N/m
723 N/m
Water is filled up to a height h in a beaker of radius R as shown in the figure. The density of water is , the surface tension of water is T and the atmospheric pressure is P0 . Consider a vertical section ABCD of the water column through a diameter of the beaker. The force on water on one side of this section by water on the other side of this section has magnitude.
A closed compartment containing gas is moving with some acceleration in horizontal direction. Neglect effect of gravity. Then the pressure in the compartment is
same everywhere
lower in the front side
lower in the rear side
lower in the upper side
