The correct answer is option 4: Flow of a liquid.
Surface tension is the property of a liquid that allows it to resist external forces and minimize its surface area. It is caused by the attraction between the molecules of the liquid.
Option 1: A nearly spherical drop of rain is a result of surface tension. Surface tension creates a force that pulls the liquid molecules together, making the shape of a raindrop as close to a sphere as possible.
Option 2: Capillary rise is also a result of surface tension. When a thin tube (capillary tube) is placed in a liquid, the liquid rises in the tube due to the cohesive forces between the liquid molecules.
Option 3: The removal of dirt by soap or detergent is achieved through the action of surface tension. Soap or detergent molecules have a hydrophilic (water-loving) end and a hydrophobic (water-repelling) end. When soap or detergent is added to water, it reduces the surface tension of the water, allowing it to penetrate and remove dirt particles.
Option 4: Alert - The flow of a liquid is not a result of surface tension. The flow of a liquid is primarily influenced by gravity, pressure, and viscosity, rather than surface tension