LEVELLING SURVEY - Practice Mode

1) What is the diameter of earth?

12842km 12742km 12724km 12785km

Correct Answer: 12742km

2) What is the curvature of earth correction?

0.1785D<sup>2</sup> 0.0857D<sup>2</sup> 0.0785D<sup>2</sup> 0.0787D<sup>2</sup>

Correct Answer: 0.0785D<sup>2</sup>

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

Correct Answer: 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

Correct Answer: Three 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

Correct Answer: Turn the focusing knob

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