Physics
Pieces of camphor placed on water move about rapidly. This is because of

Viscosity
Diffusion
Capillarity
Surface tension

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Physics
What is a compound microscope?

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

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