World Geography
The time interval from when the given star passes directly overhead to when it next passed directly overhead, is defined as

one solar day
both the terms are similar, so any of these may be used
one sidereal day
None of these

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World Geography
The periodic rise and fall of the sea level on the earth, gives rise to tides. This is related to

ultraviolet rays from the sun
None of these
the position of the moon with reference to the earth and the gravitational pull exerted mainly by the moon and partly by the sun
infrared rays from the sun

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