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

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

ANSWER DOWNLOAD EXAMIANS APP

Surveying
For a line AB

both (A) and (B) are correct
the forebearing of AB and back bearing of AB differ by 180°
none is correct
the forebearing of AB and back bearing of BA differ by 180°

ANSWER DOWNLOAD EXAMIANS APP