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Which of the following is a nonadjustable, single-section ladder?
Correct Answer:
Wall ladder
Explanation:
The main idea is recognizing ladders by whether their length is fixed and whether they’re mounted or portable. A nonadjustable, single-section ladder stays the same height and isn’t meant to be moved or extended; it’s a single rigid piece. A wall ladder fits this description because it’s attached to a wall and has a fixed length with no telescoping or folding sections. The other options involve moving or changing height: extension ladders are designed to telescope to different lengths, and step or portable ladders are designed to be moved and often include hinges or multiple parts, so they’re not just a single fixed section. So the wall ladder is the one that is nonadjustable and single-section.

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