Chapter 2

What is the definition of levelling?

• A method of measuring horizontal distances between points

• A technique used to measure temperature at different points on the earth

• A process of determining the height difference between two or more points relative to a reference datum

• A procedure for calculating the volume of land based on elevation changes

What is the correct definition of a level surface?

• A surface that is always perpendicular to the direction of gravity

• A curved surface where the direction of gravity is always perpendicular

• A flat surface that is parallel to the ground at all points

• A horizontal plane that does not change with altitude

Which of the following is the correct order of steps in the levelling procedure?

• Set up the instrument → Take Foresight (FS) → Take Back Sight (BS) → Calculate Reduced Level (RL)

• ake Back Sight (BS) → Set up the instrument → Take Foresight (FS) → Calculate Height of Collimation (HOC)

• Set up the instrument → Take Back Sight (BS) → Take Intermediate Sight (IS) → Take Foresight (FS) → Calculate Reduced Level (RL)

• Set up the instrument → Calculate Reduced Level (RL) → Take Back Sight (BS) → Take Foresight (FS)

What are the two main methods used for reducing levels in levelling?

• Rise and Fall Method and Total Station Method

• Height of Collimation Method and Triangulation Method

• Rise and Fall Method and GPS Method

• Rise and Fall Method and Height of Collimation Method

What is the key feature of the Height of Collimation (HOC) Method in levelling?

• It tracks the movement of the surveyor

• It uses a GPS to determine the elevation

• It calculates the height of the instrument at each point to determine elevation

• It measures the angle of the land surface

What is the purpose of adjusting the misclosure in levelling?

• To make sure all points are measured in the same unit

• To correct for errors and ensure accurate height measurements

• To adjust for the time of day during the survey

• To calculate the exact distance between points

What is the formula to calculate the correction/adjustment for misclosure?

• Number of station x (total number of station/error)

• Total number of station x (error/number of station)

• Number of station x error

• Number of station x (error/total number of station)

Identify the reading of level staff?

• 2.599m

• 2.596m

• 2.594m

• 2.598m

How do you calculate Loop Misclosure?

• Misclosure = Total Rise - Total Fall

• Misclosure = (Final RL + Initial RL) / 2

• Misclosure = Final RL + Initial RL

• Misclosure = Final RL - Initial RL

If the initial RL is 50.216m and the final RL after completing a loop is 50.221m, what is the misclosure?

• 0.006m/6mm

• 0.005m/5mm

• 0.021m/21mm

• 0.016m/16mm