The process in which tiny water droplets collide, combine, grow, and eventually fall from clouds is based on which process?

Correct answer: संलयन और संघट्टन प्रक्रिया (Coalescence and collision process)

Correct answer: B, coalescence and collision. Clouds contain extremely small liquid droplets or ice particles suspended in air. Air currents make these particles move and collide. When two droplets join, the combined droplet is larger and heavier. Repeated collisions and coalescence can produce drops large enough for gravity to overcome the upward support of air, so they fall as precipitation. A is wrong because evaporation changes liquid water into vapour; it does not describe droplets joining and falling. C is wrong because osmotic pressure concerns the movement of water across a selectively permeable membrane due to differences in solute concentration, not cloud droplets. D is wrong because capillary force moves liquid through narrow spaces or pores and is not the main mechanism described here. In some clouds, ice-crystal growth also contributes to precipitation, but the wording specifically highlights droplets colliding and combining. Memory cue: collision plus joining equals coalescence; bigger drops can fall.