Surveying
Spring tides are caused when

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

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Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to eccentricity of verniers
error due to imperfect graduations
error due to imperfect adjustment of plate levels
error due to line of collimation not being perpendicular to horizontal axis

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