Physics
Which microscope is often used to view metal surfaces?

Optical microscopes
Scanning tunneling microscopes
None of these
Electron microscopes

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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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Physics
Planets do not twinkle because

Their distance from the earth does not change with time
They are nearer to earth and hence we receive a greater amount of light.
They are very far away from the earth resulting in decrease in intensity of light
They emit light of a constant intensity

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