An angle between the inclined line of sight and the horizontal is called ............

In leveling, the effect of refraction may be taken as ............ of that due to curvature.

The strength of fix is poor when ............

The magnetic meridian at any point, is the direction indicated by a freely suspended ............

Contours of different elevations may cross each other only in the case of ............

In chain surveying field work is limited to ............

The collimation method for obtaining the reduced levels of points does not provide a check on ............

Collimation method is use in ............

An axis about which the telescope can be rotated in a horizontal plane is called ............