Which of the following conditions can lead to struck-by accidents?

Struck-by accidents often occur in construction environments, particularly when heavy materials or tools are being moved, assembled, or manipulated. Choosing to focus on constructing concrete and masonry walls highlights a scenario where workers may be at risk of being struck by falling objects or equipment.

During the construction of walls, items such as bricks, blocks, or scaffolding can be inadvertently dropped or knocked over, creating a danger for anyone in the vicinity. It's crucial in such situations to have proper safety measures in place, such as hard hats, barriers, and communication protocols to mitigate these risks.

While improper lifting techniques, excessive noise levels, and slippery surfaces are indeed safety concerns in construction environments, they do not directly relate to the specific mechanics of being struck by objects. Improper lifting techniques could lead to injuries but not necessarily relate to being struck; excessive noise might hinder communication but is not a direct cause of an object striking an individual; slippery surfaces create fall hazards rather than striking hazards.