Q. Oil rises up the wick in a lamp because__:
Answer: Of the capillary action phenomenon
Notes: It is because of the capillary action that oil rise up the wick in a lamp. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity. The effect can be seen in the drawing up of liquids between the hairs of a paint-brush, in a thin tube, in porous materials such as paper.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 22 in Physics GK 11 - Surface Tension & Capillarity in above course in App.