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:

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

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Physics
'Mirage' is an example of

Refraction of light only
Refraction and total internal reflection of light
Dispersion of light only
Total internal reflection of light only

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