Surveying
If α, H, A and δ be the altitude, hour angle, azimuth and declination of a circumpolar star at its elongation, in latitude λ, the following relation holds good

sin A = cos δ/cos λ
cos H = tan λ/tan δ
All listed here
sin α = sin λ/sin δ

ANSWER DOWNLOAD EXAMIANS APP

Surveying
Spring tides are caused when

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
None of these

ANSWER DOWNLOAD EXAMIANS APP