NICET - Highway Construction Inspection Practice Exam

What is a survey rod used for?

1. To calculate angles between points

2. To record observed numbers for elevation determination

3. To transmit measurements electronically

4. To measure distances over large areas

The correct answer is: To record observed numbers for elevation determination

A survey rod is primarily used to facilitate the determination of elevation and topographical features. When personnel use a survey rod in conjunction with a leveling instrument, they are able to take precise measurements of difference in height between points. This measurement is essential in establishing ground levels in construction projects, ensuring that structures are built at the correct elevations and aligning with design specifications. The process typically involves placing the rod at a specific location on the ground and reading the measurement displayed on it, which indicates the vertical distance from a reference point, usually the line of sight from a leveling instrument. This ability to accurately record observed numbers related to elevation helps ensure the integrity and precision required in highway construction and other civil engineering projects. While calculating angles, transmitting measurements, and measuring long distances are important aspects of surveying, these tasks are commonly performed using different tools and techniques. The survey rod's main function remains closely linked to elevation determination, which directly impacts design and construction accuracy.