Fall ProtectionCâu 54 / 100
How should a straight or extension ladder be positioned against a wall (the 4-to-1 rule)?
a.4 feet out for every 1 foot of height
b.Straight up vertically
c.1 foot out at the base for every 4 feet of working height
d.At a 90-degree angle
Giải thích
The 4-to-1 rule means the base of the ladder should be placed 1 foot away from the wall for every 4 feet of vertical working height. This angle provides stability and reduces the chance of the ladder sliding out. Setting the ladder too steep or too shallow increases fall risk.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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