Physics
Carbon Arc lamps are commonly used in

Cinema projectors
Photography
Domestic lighting
Vehicles

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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.
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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