Physics
Velocity of sound in air does not depend on

Temperature of air
Humidity of air
Density of air
Pressure of air

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

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