The horizontal angle between true meridian and magnetic meridian, is known ............

In the double application of principle of reversion, the apparent error is ............

The two point problem and three point problem are methods of ............

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

Imaginary line passing through points having equal magnetic declination is termed as ............

The length of an engineer's chain is ............

A point determined by resection on a plane table is called ............

In Indian tangent clinometer is associated with ............

Ten readings were recorded in a level field book. If the instrument was shifted after 2nd and 6th readings, then the for…