Physics
The mass of a star is two times the mass of the Sun. How it will come to an end ?

Red Giant
White Dwarf
Black hole
Neutron Star

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Physics
What is a compound microscope?

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

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