Physics
The magnifying power of an astronomical telescope can be decreased by

None of these
Decreasing the focal length of the eyepiece
Increasing the focal length of the eyepiece
Increasing the focal length of the objective

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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:

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

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Physics
Isotopes of an element contain

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

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