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

Correction for refraction for a distance of 1 km = ............

Resolving power of a telescope depends on ............

When R is the radius of the curve (in metres), D is the degree of curve (in degrees) and length of the chord is 30 m, th…

It is more convenient and gives better results while measuring horizontal distance ............ by stepping method.

When the bubble of the level tube of level, remains central ............

If vertical angles of inclined sights do not exceed 10° and non-verticality of the staff remain within 1° stadia system …

q1 and q2 are the angles of elevation from A to the top and bottom of vertically held rod of length S at B. The horizont…

The instrument used for setting out an offset at a right angle, is called ............