Perpendicularity of an offset may be judged by eye, if the length of the offset is

Removal of parallax, may be achieved by focusing

A 'level line' is a

Which one of the following procedures for getting accurate orientation is the most distinctive feature of the art of pla…

Radiation plane table survey is the best suited when

Closed traverse is suitable in the survey of

The line normal to the plumb line is known as

Pick up the most accurate statement from the following.

The permissible limits of error in chaining for measurement on rough of hilly ground is