In the double application of principle of reversion, the apparent error is _____ ?
A. two times the true error
B. four times the true error
C. equal to true error
D. half the true error
contouring
Contour interval is ____ ?
A. larger for accurate works
B. larger if the time available is more
C. inversely proportional to the scale of the map
D. directly proportional to the flatness of ground
Direct method of contouring is ___ ?
A. most accurate method
B. suitable for hilly terrains
C. a quick method
D. adopted for large surveys only
In direct method of contouring, the process of locating or identifying points lying on a contour is called _____ ?
A. centring
B. centring
C. vertical control
D. ranging