Physics
What is a compound microscope?

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

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Physics
Planets are

luminous heavenly bodies that do not twinkle
luminous heavenly bodies revolving around a star
luminous heavenly bodies that twinkle
non-luminous heavenly bodies

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Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
The densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.
Both its limbs are of unequal length.

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