Physics
Isotopes of an element contain

the same number of neutrons but different number of protons
equal number of nucleons
the same number of protons but different number of neutrons
equal number of protons and electrons

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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:

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

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Physics
'Mirage' is an example of

Total internal reflection of light only
Refraction of light only
Dispersion of light only
Refraction and total internal reflection of light

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