Advertisements
Advertisements
प्रश्न
For a surface molecule ______.
- the net force on it is zero.
- there is a net downward force.
- the potential energy is less than that of a molecule inside.
- the potential energy is more than that of a molecule inside.
उत्तर
b and d
Explanation:
Consider the diagram where two molecules of a liquid are shown. One is well inside the liquid and the other is on the surface. The molecule (A) which is well inside experiences equal forces from all directions, hence net force on it will be zero.
And molecules on the liquid surface have some extra energy as it surrounded surround by only the lower half side of the liquid molecules.
APPEARS IN
संबंधित प्रश्न
Show that the surface tension of a liquid is numerically equal to the surface energy per unit
area.
The contact angle between pure water and pure silver is 90°. If a capillary tube made of silver is dipped at one end in pure water, will the water rise in the capillary?
When water droplets merge to form a bigger drop
If two soap bubbles of different radii are connected by a tube,
The excess pressure inside a soap bubble is twice the excess pressure inside a second soap bubble. The volume of the first bubble is n times the volume of the second where n is
Viscosity is a property of
A cubical block of ice floating in water has to support a metal piece weighing 0.5 kg. Water can be the minimum edge of the block so that it does not sink in water? Specific gravity of ice = 0.9.
Why is the surface tension of paints and lubricating oils kept low?
A capillary of diameter d mm is dipped in water such that the water rises to a height of 30 mm. If the radius of the capillary is made `(2/3)` of its previous value, then compute the height up to which water will rise in the new capillary?
A molecule of water on the surface experiences a net ______.
