Physics
A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because

Stone is heavier than parachute
Special mechanisms are present in parachute
A parachute has a larger surface area and air resistance is more
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.
mercury is a metal.
cohesion of mercury is greater than its adhesion with glass.

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