Question

Artificial rain is based on the principle of:
A. Coagulation
B. Electrophoretic effect
C. Emulsification
D. Tyndall effect

Answer 1

During artificial rain, silver iodide, potassium iodide and dry ice is spread over the clouds. The spreading of dry ice stimulates the growth of water droplets.

Complete step by step answer:
During artificial rain, silver iodide, potassium iodide and dry ice is spread over the clouds. This process is known as cloud seeding. The spreading of dry ice stimulates the growth of water droplets.
These water droplets collide with each other. The collision of water droplets causes coagulation of the droplets. After coagulation, the cloud breaks and the water droplets reach the earth.
The process in which chemicals are added and these chemicals cause the suspended particles in water to come and stick together is known as coagulation.
The coagulating agents used during artificial rain cause clumping of the water droplets which finally results in rain.
Thus, artificial rain is based on the principle of coagulation.

So, the correct answer is “Option A”.

Additional Information:
Some disadvantages of advantages of artificial rain are:
1. Chemicals used in artificial rain are harmful for the environment.
2. Climatic patterns can be changed due to artificial rain.

Note:
The effect the flow of electrons affects the mobility of ions in the solution is known as electrophoretic effect.
The process in which two liquids are mixed to form an emulsion is known as emulsification.
The scattering of a beam of light when it is passed through a medium that contains suspended particles is known as Tyndall effect.
These three effects cannot be the basis of artificial rain.