Physics
The period of revolution of a geostationary satellite is

24 hours
365 days
30 days
Changing continuously

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Physics
Siphon will fail to work if:

The densities of the liquid in the two vessels are equal.
The temperature of the liquids in the two vessels are the same.
The level of the liquid in the two vessels are at the same height.
Both its limbs are of unequal length.

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