Question

Concave (or) convex meniscus of liquids is due to _________.

• A. viscosity
• B. cohesive force only
• C. adhesive force only
• D. cohesive and adhesive forces.

Answer 1

The correct option is D

cohesive and adhesive forces.

The meniscus of water is

1. The meniscus of water is concave because the adhesive force between water molecules and glass is stronger than the cohesive force between water molecules.
2. Mercury has a convex meniscus because it tends to be drawn into the droplets by the cohesive force of liquid mercury. The cohesive force in the drop becomes stronger. The cohesive force between glass and strong ones is relatively weak. Therefore, Mercury has a convex meniscus.

Convex (or) concave meniscus of liquids is due to both cohesive and adhesive forces.
Hence, the correct option is (d).