Physics
A fresh egg when placed in salt water will

Burst
Float
Sink and go to the bottom
Sink but will not go to the bottom

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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:

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

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