Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

cohesion of water is greater than its adhesion with glass.
density of mercury is greater than that of water.
mercury is a metal.
cohesion of mercury is greater than its adhesion with glass.

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Physics
Why does the sea appear blue in colour?

Reflection of the sun light from water surface
Scattering of the sunlight by water molecules
Refraction of the sun light
Interference of the sun light from water surface

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