Surveying
The distance between the projection centre and the photograph, is called

Focal length
Principal distance
Principal line
Isocentric distance

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Surveying
Spring tides are caused when

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

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Surveying
Circumpolar stars

Remain always above the horizon
Rotate round the celestial pole
Rotate round the North Pole
Are seldom seen near the pole star

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