Surveying
A ’level line’ is a

horizontal line
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

ANSWER DOWNLOAD EXAMIANS APP

Surveying
Homologous points are

Plumb points of stereo pair of photographs
Opposite corners of a photograph
Corresponding points on the ground and photograph
Nodal points of the camera lens

ANSWER DOWNLOAD EXAMIANS APP

Surveying
Which of the following errors cannot be eliminated by taking both face observations ?

error due to non-parallelism of the axis of telescope level and line of collimation
error due to horizontal axis not being perpendicular to the vertical axis
index error i.e. error due to imperfect adjustment of the vertical circle vernier
None of these

ANSWER DOWNLOAD EXAMIANS APP