SafetyCâu 660 / 700
A single portable ladder is used repeatedly to access an upper landing. Which combination of practices BEST reduces the risk of the ladder shifting or a worker falling?
a.Carry tools in both hands and climb quickly to spend less time on the ladder
b.Leave the base loose so the ladder can self-adjust, and slide down the rails to descend
c.Allow two workers on the ladder at once to pass materials
d.Secure the ladder at the top, block or tie the base against slipping, face the ladder, and keep three points of contact while climbing
Giải thích
Correct: securing the top, stabilizing the base against sliding, facing the ladder, and maintaining three points of contact are the core safe-climbing practices. Climbing with full hands, sliding the rails, leaving the base loose, or putting two workers on one ladder all defeat stability and three-point contact and are unsafe.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A ladder is stamped 'Type IA.' What MAXIMUM working load (duty rating) does this designation indicate?
- A crew must work near exposed energized electrical conductors. Which ladder choice is BEST for this task?
- A worker sets up a stepladder to reach a ceiling fixture. Which practice is correct?
- A competent person classifies excavation soil by unconfined compressive strength. Which value range correctly identifies Type B soil?
- CALCULATION: A 6-foot-deep trench in Type A soil will be protected by sloping instead of shoring. Type A allows a maximum slope of 3/4 horizontal to 1 vertical (about 53 degrees). Measured from the trench bottom, how far back from the edge (horizontal run on each side) must the top of the slope extend?
- A contractor wants to use a benched (stepped) excavation wall as the protective system. In which soil is benching NOT permitted?
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