NEET 2013 Physics question

The wettability of a surface by a liquid depends primarily on -

(1)viscosity
(2)surface tension
(3)density
(4)angle of contact between the surface and the liquidCorrect

Answer: (4)

Solution

Whether a liquid wets a solid surface is decided by the angle of contact between the liquid surface and the solid surface. If the liquid wets the surface (spreads, e.g. water on clean glass); if it does not wet it (e.g. mercury on

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Question ID VK-091307