Physics
Compressions and Rarefactions are characteristic of

Both A & B
Transverse waves
Neither of A & B
Longitudinal waves

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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:

mercury is a metal.
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.

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