The behavior of a liquid drop on a surface is determined by the balance between the liquid's cohesive forces (attraction between its own molecules) and the adhesive forces (attraction between the liquid molecules and the surface molecules).
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
Asked in KPSC KAS Prelims 2014 · Topic: Physical Properties of Materials (Viscosity and Surface Tension)
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Answer: B. Cohesive force for mercury is greater than adhesive force with glass.
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