Surveying
If ‘δ’ is the declination of the star and ‘φ’ is the latitude of the observer then the hour angle of the star at elongation is given by

sin H = tan φ . cot δ
None of these
cos H = tan φ . cot δ
tan H = tan φ . cot δ

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Surveying
Spring tides are caused when

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

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Surveying
A ’level line’ is a

line passing through the center of cross hairs and the center of eye piece
line passing through the objective lens and the eye-piece of a dumpy or tilting level
line parallel to the mean spheriodal surface of earth
horizontal line

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