LEVELLING SURVEY - Quiz

1) What is the diameter of earth?

12842km 12742km 12724km 12785km

2) What is the curvature of earth correction?

0.1785D² 0.0857D² 0.0785D² 0.0787D²

3) Which level is that the line of sight remains horizontal once the operator has roughly levelled the instruments?

Dumpy level Modern level Wye level Auto level

4) How many level screws are used to level the instruments?

Two level screws Three level screws Four level screws Six level screws

5) How to eliminate parallel between the staff and reticle in auto level?

Turn the focusing knob Adjust the levelling screw Adjusting screw cover Setting of the tripod