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

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Physics
The bats can fly in the dark because

They generate flashes of light
They can see the objects in darkness
They generate ultrasonic sound waves
They have weak legs and are likely to be attacked by predators

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Physics
The sky appears blue because

All colours interfere to produce blue
The atmosphere scatters blue colour more than the others
In white light, the blue component dominates
It is actually blue

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Physics
Superconductors are those elements

Which conduct electricity only at super-high temperatures
Whose conductivity is intermediate between metals and insulators
Which turn into insulators at very low temperatures
Whose resistance falls almost to zero at very low temperatures

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