Q. The wettability of a surface by a liquid depends primarily on -
A) viscosity
B) surface tension
C) density
D) angle of contact between the surface and the liquid
Explanation
[Solution from source] Whether a liquid wets a surface is decided by the angle of contact: an acute angle means wetting, an obtuse angle means non-wetting. Surface tension alone does not decide this, since the contact angle depends on the balance of adhesive and cohesive forces. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.