#1
What is the recommended slope angle for excavation walls to prevent collapse?
45 degrees
60 degrees
90 degrees
30 degrees
#2
Which of the following is a common hazard associated with excavation and trenching?
Excessive paperwork
Excessive noise
Trench collapse
Office politics
#3
What is the purpose of a trench safety checklist?
To list employee grievances
To assess the need for trenching
To identify hazards and control measures
To schedule equipment maintenance
#4
What is a common method to protect workers from cave-ins in trenching operations?
Using ladder cages
Installing trench boxes
Adding temporary lighting
Increasing noise barriers
#5
Which organization sets standards for trenching and excavation safety in the United States?
#6
Which of the following is a primary cause of trench collapses?
Excessive sunlight
High humidity
Heavy rain
Unprotected trench walls
#7
What is the minimum clearance required from an overhead power line when conducting excavation work?
5 feet
10 feet
15 feet
20 feet
#8
Which protective system involves the use of hydraulic pressure to brace trench walls?
Shoring
Sloping
Benching
Shielding
#9
What is the maximum allowable depth for a trench before a protective system is required?
5 feet
10 feet
15 feet
20 feet
#10
Which of the following is NOT a primary responsibility of the competent person on a trenching site?
Identifying hazards
Supervising workers
Designing trench layouts
Inspecting protective systems
#11
What is a common precautionary measure for workers inside a trench?
Wearing noise-canceling headphones
Standing near heavy equipment
Using fall protection equipment
Walking along the trench edge
#12
Which of the following soil types poses the highest risk of collapse in a trench?
Type A soil
Type B soil
Type C soil
Type D soil
#13
What is the primary purpose of a trench box or trench shield?
To provide a working platform
To provide oxygen supply
To protect workers from cave-ins
To protect against noise
#14
What is a potential hazard of improper soil classification?
Increased stability
Decreased trench depth
Decreased risk of collapse
Incorrect protective system selection
#15
What is the primary function of a trench safety stand-down?
To halt all trenching activities
To conduct safety training
To increase productivity
To assess equipment performance
#16
What is the primary purpose of a trench safety plan?
To increase project completion time
To ensure worker satisfaction
To mitigate risks and hazards
To decrease equipment maintenance costs