In an internal focusing type of telescope, the lens provided is ............

Sensitiveness of a level tube depends upon ............

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

In order to determine the natural features such as valleys, rivers, lakes, etc., the surveying preferred is ............

Magnetic declination at any place ............

While measuring with a metallic tape of 30 m length pull should be applied ............

If the whole circle bearing of a line is 180°, its reduced bearing is ............

Point of tangency is the ............

The type of surveying which requires least office work is ............