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10 Question-answer on surface tension 1.        Surface tension of a liquid is due to: (a)     Gravitational force between molecules (b)    electrical force between molecules (c)     adhesive force between molecules (d)    cohesive force between molecules Ans: ( d) 2.        Surface tension may be defined as: (a)     The work done per unit area in increasing the surface area of a liquid under isothermal conditions (b)    The work done per unit area in increasing the surface area of a liquid under adiabatic conditions (c)     The work done per unit area in increasing the surface area of a liquid under adiabatic conditions (d)    Free surface energy per unit volume Ans: (a) 3.        Kerosene oil rises up in a wick of a lantern because of: (a)     Diffusion of t...