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?

0.1785D2 0.0857D2 0.0785D2 0.0787D2

Correct Answer: 0.0785D2

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

Explanation:

The factors that must be present in combination for a fire to continue to burn are Fuel, Heat and Oxygen. Isolating or removing any of these factors from the combination will extinguish the fire. There are three basic ways of achieving this.

*Starving: Starving is the method of extinguishing the fire by removing the fuel in the vicinity of fire.

*Smothering: Smothering is the method of extinguishing the fire by removing the oxygen with blanketing fire with foam, sand etc.

*Cooling: Cooling is the process of extinguishing the fire by using water to lower the temperature.

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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