Physics
If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated?

Decreases
Depends upon the metal
Increases
Unchanged

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Physics
What is a compound microscope?

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

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