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
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

mercury is a metal.
cohesion of mercury is greater than its adhesion with glass.
cohesion of water is greater than its adhesion with glass.
density of mercury is greater than that of water.

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Weighing will depend on their masses
The gold piece will weigh more
Both silver and gold pieces weigh equal
The silver piece will weigh more

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