The method generally preferred to for contouring an undulating area is,

The amount of correction due to local attraction at a place

A line normal to the plumb line at all points is known as

The error in measured length due to incorrect holding of chain is

Which of the following instruments can be used for the direct measurement of directions?

Magnetic bearing of a survey line at any place

Contour lines

Different types of EDM's are obtained on the basis of

The spacing of cross-sections in a hilly country is usually