CST Level 1 Land Surveyor Certification Practice

What does a plumb bob do when there is slight wind?

1. Falls directly down without movement

2. Swings back and forth rapidly

3. Bounces slightly on the point being marked

4. Becomes unstable and unusable

The correct answer is: Bounces slightly on the point being marked

A plumb bob is a simple tool used in surveying that consists of a weight suspended from a string, allowing it to provide a vertical reference line. When there is slight wind, the plumb bob experiences minor disturbances in its stability. In this situation, the weight can be influenced by the wind, causing it to react, but since the weight is still heavy, it doesn't swing wildly; instead, it may bounce slightly on the point being marked. This behavior is a reflection of the plumb bob's tendency to return to its resting vertical position while being momentarily affected by the external force of the wind. This slight bouncing does not make the plumb bob unusable nor does it cause rapid swinging, as its mass helps dampen the effects of the wind. Understanding this behavior is crucial for surveyors, as it allows them to assess how environmental factors might affect measurements and ensure accuracy in their work.