Physics
The wall of a dam is broader at the base

To withstand pressure that increases in a horizontal plane
To withstand pressure that increases with depth
Because streamlining is required
To withstand pressure that is increased with atmospheric pressure

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Physics
What is a compound microscope?

A microscope whose lenses are concave.
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.

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