Physics
The apparent weight of a man in a lift is less the real weight when :

The lift is going down with an acceleration
The lift is going down with uniform speed
The lift is going up with an acceleration
The lift is going up with uniform speed

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Physics
What is a compound microscope?

A microscope whose lenses are convex.
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.

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