An invar tape is generally used for accurate measurement of distance because it possesses ............ coefficient of thermal expansion.

If the length of chain is found to be short on testing, it can be adjusted by ............

Diurnal variation of magnetic declination is ............

Number of links per metre length of a chain are ............

The difference between the sum of the angles of a spherical triangle on the earth's surface and the angles of the corres…

A well conditioned triangle has no angle less than ............

Straight, parallel and widely spaced contours represent ............

The angle of field of the telescope ............

Ranging is an operation of ............