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

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

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Physics
Ice is packed in saw dust because

Saw dust is a good conductor of heat.
Saw dust will not get melted easily.
Saw dust is poor conductor of heat.
Saw dust does not stick to the ice.

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