49. Rise of oil a wick is due to A.Density of the oil B.Viscosity of the oil C.Surface tension of the oil D.Pressure of the oil
Option C Solution: The phenomenon of rise or fall of liquid in a capillary tube is called capillarity. Oil rises through a wick due to capillarity. The narrow pores in the threads of a wick act like tiny capillaries, through which oil rises. Capillary action is the result of adhesion and surface tension.
