North Carolina Building Contractor License Practice Exam

A benchmark is the elevation of a fixed reference point like a catch basin lid or an existing what?

1. Concrete slab

2. Clegg hammer

3. Main sewer line

4. Fence post

The correct answer is: Clegg hammer

The correct answer relates to the concept of benchmarks in surveying and construction. A benchmark is a recognized point of reference with a known elevation used to measure heights and perform leveling in construction and civil engineering projects. In this context, a benchmark can be the elevation of any fixed, stable point that is easily identifiable and does not change over time. Among the options provided, the Clegg hammer is not relevant, as it is a tool used for measuring the hardness of soil rather than serving as a physical reference point like a catch basin lid or an existing elevation point. Instead, potential correct benchmarks would be structures or features that retain a consistent height and can be reliably used for leveling activities. Things like concrete slabs, main sewer lines, and even fence posts can be used as benchmarks provided they are stable and have a known elevation. However, since the answer given does not align well with the function of a benchmark, it points to a need for understanding specific terminology and tools related to construction and engineering measurements.