If a crack appears in a trench wall, what is the correct scientific response?
Answer and explanation
Correct answer: Evacuate the area, assess the risk, and shore the wall
The governing concept is excavation-site safety and controlled risk assessment. A crack may show soil movement or impending trench-wall failure, so people must first leave the danger zone. The wall should then be examined by a competent person and stabilised with suitable shoring or another engineered measure before work resumes. Option B is correct. Recording the crack is useful, but continuing excavation, hiding it, or taking only a photograph leaves workers exposed to collapse.
Frequently asked questions
What is the correct answer to this question?
Evacuate the area, assess the risk, and shore the wall
Why is this the correct answer?
The governing concept is excavation-site safety and controlled risk assessment. A crack may show soil movement or impending trench-wall failure, so people must first leave the danger zone. The wall should then be examined by a competent person and stabilised with suitable shoring or another engineered measure before work resumes. Option B is correct. Recording the crack is useful, but continuing excavation, hiding it, or taking only a photograph leaves workers exposed to collapse.
Which subject and chapter does this question cover?
This is a Class 12 History question. Chapter: Bricks, Beads and Bones. Topic: excavation methods.
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