Physics
Angle of friction and angle of repose are

Equal to each other
Proportional to each other
Not equal to each other
None of these

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

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