Physics
What is a compound microscope?

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

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Egg absorbs salt from the solution and expands
The density of salt solution exceeds the density of eggs
Albumin dissolves in salt solution and egg becomes lighter
Water has high surface tension

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