Surveying
The scale of a tilted photograph of focal length f taken from an altitude H, along the plate parallel through principal point is

f/H cos ½θ
f/H sec θ
f/H
f sec θ/H

ANSWER DOWNLOAD EXAMIANS APP

Surveying
Dumpy level is most suitable when

the instrument is to be shifted frequently
fly levelling is being done over long distance
many readings are to be taken from a single setting of the instrument
All of these

ANSWER DOWNLOAD EXAMIANS APP