Physics
The propagation of sound waves in a gas involves

Isobaric compression and rarefaction
Adiabatic compression and rarefaction
Isochoric compression and rarefaction
Isothermal compression and rarefaction

ANSWER DOWNLOAD EXAMIANS APP

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.

ANSWER DOWNLOAD EXAMIANS APP