RRB RPF RPSF SI and CONS Model Papers 5 with solutions

(3) Surface tension is responsible for the spherical shape of the liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer that make them stick together. In the absence of other forces such as gravity, drops of virtually all liquids would be approximately spherical. The spherical shape minimizes the necessary "wall tension" of the surface layer according to Laplace's law.