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

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

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Physics
The term ''equinox' means

When the day and night are of equal duration
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
The path which the Earthtakes around the Sun
The axis of the Earth around which it rotates

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Physics
Rainbow is due to

ionisation of water deposits
absorption of sunlight in minute water droplets
refraction and reflection of sunlight by water droplets
diffusion of sunlight through water droplets

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