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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Physics
Superconductors are substances which

conduct electricity at low temperature
conduct electricity at high temperatures
offer no resistance to the flow of electricity
offer high resistance to the flow of current

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