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

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Physics
Planets are

non-luminous heavenly bodies
luminous heavenly bodies revolving around a star
luminous heavenly bodies that do not twinkle
luminous heavenly bodies that twinkle

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