Physics
Which one of the following processes is responsible for the glittering of air bubble rising through water?

Refraction of light
Total internal reflection of light
Scattering of light
Reflection of light

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

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