1.

The clouds consist of charged particles of water dispersed in air. Some of them are + vely charged, others are negatively charged. When + vely charged clouds come closer they have cause lightening and thundering whereas when + ve and –ve charged colloids closer they cuase heavy rain by aggregation of minute particles. It is possible to cause artificial rain by throwing electrified sand or silver iodide from an aeroplane and thus coagulation the mist hanging in air. Electrical chimneys are made on the principle of

Answer»

Electroosmosis
Electrophoresis
Coagulation
All of these

Answer :B


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