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

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

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

sand is soft and concreter is hard.
the friction between sand and feet is less than that between concrete and feet.
the friction between sand and feet is more than that between concrete and feet.
the sand is grainy but concrete is smooth.

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