WBCS.LIVE practice question

The continuous rise of oil in the wick of an earthen lamp is primarily due to which physical phenomenon?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Surface tension
  2. Viscosity
  3. Capillary action
  4. Atmospheric pressure

Correct answer and explanation

Correct answer: Capillary action

Explanation: āœ… Correct Answer: C) Capillary action šŸ“š Explanation: Capillary action is the remarkable ability of a liquid to flow through narrow spaces or porous materials directly against the force of gravity. In an earthen lamp, the tightly woven cotton wick contains thousands of microscopic narrow tubes. The oil continuously rises through these tiny spaces due to the adhesive and cohesive forces of the liquid.