Physics
What is a compound microscope?

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

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Physics
Pressure Cooker cooks faster because

Higher temperature is attained for cooking
The material of the cooker is a good conductor
It cooks the food at low pressure
Boiling point decreases with rise of pressure

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