Question 4. Choose the wrong statement from the following. (a) Small droplets of a liquid are spherical due to surface tension (b) Oil rises through the wick due to capillarity (c) In drinking the cold drinks through a straw, we use the phenomenon of capillarity (d) Gum is used to stick two surfaces. In this process we use the property of Adhesion Answer
Correct option is C) For capillary action the diameter of tube should be very small. Liquid rises in the capillary tube due to surface tension. But while drinking cold drinks, we need to create low pressure closer to mouth and due to the pressure difference between the top and the bottom of the straw, cold drink rises. So the rise of cold drink in straw is not due to capillary action.
