Physics
Superconductors are those elements

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

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Physics
What is a compound microscope?

A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are convex.
A microscope that has one lens.
A microscope whose lenses are concave.

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