Surveying
If v, t and f/H are the ground speed of the aircraft, the shutter speed of the camera and the scale of the photograph respectively, then the amount of image displacement

i = v. t. H/f
i = t. H/v. f
i = v. f/t. H
i = v. t. (f/H)

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Surveying
Spring tides are caused when

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

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