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:

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

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Physics
Scalar Quantities are

Physical quantities which have magnitude only and direction
Physical quantities which have magnitude only and no direction
Physical quantities which have no magnitude and no direction
Physical quantities which have no magnitude only and only direction

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