Surveying
The displacement of the pictured position of a point of h elevation on a vertical photograph taken with a camera of 30 cm focal length, from an altitude of 3000 m, is

6.5 mm
5.5 mm
4.4 mm
7.5 mm

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Surveying
Spring tides are caused when

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

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