Surveying
If the altitudes of a star at its upper and lower transits are 60° 30' and 19° 30' respectively, the latitude of the place, is

35°
30°
45°
60°

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Surveying
Spring tides are caused when

Solar tidal force acts opposite to lunar tidal force
Solar tidal force and lunar tidal force both coincide
None of these
Sun and moon are in line with earth

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