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 eyepiece
Increasing the focal length of the objective
None of these

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Physics
A drop of liquid assumes spherical shape because:

A sphere has the largest surface area for a given volume
Intermolecular forces are strong in liquids
Inter molecular forces are weak in liquids
A sphere has the least surface area for a given volume

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