NCIDQ IDFX Practice Exam

What type of connection is described as being rigid but adjustable?

1. A nail connection

2. A ledger screwed to a wall

3. A joint with no motion

4. A connection with added flexibility

The correct answer is: A ledger screwed to a wall

The description of a connection being rigid but adjustable is best exemplified by a ledger screwed to a wall. This type of connection provides structural support (making it rigid) while also allowing for some degree of adjustment. For instance, the ledger can be repositioned to ensure proper alignment or to accommodate changes in design or load requirements. This is particularly valuable in construction and interior design, as it allows for necessary modifications without sacrificing the strength and stability of the connection. In contrast, other options either indicate a lack of adjustability or flexibility. A nail connection typically does not offer significant adjustments once installed, as nails create a fixed connection. A joint with no motion inherently lacks adjustability because it signifies a completely rigid connection without provisions for repositioning. Lastly, a connection with added flexibility implies a design that allows for movement or bending, which contrasts with the specified rigidity of the connection in the question. Thus, the ledger option fits the criteria of being both rigid and adjustable.