TRENCH SAFETY COMPETENT PERSON CERTIFICATION
PRACTICE EXAM NEWEST (2025 - 2026 UPDATE) FROM
REAL PAST PAPERS QUESTIONS – SET 100 MOST
COMMON EXAM FREQUENTLY TESTED QUESTIONS AND
ANSWERS IN DETAILS 100% VERIFIED EXAM HIGHLY
RECOMMENDABLE FOR GRADE A+
1. What is the primary responsibility of a competent person on a trenching
site?
A. Operate heavy machinery
B. Design excavation equipment
C. Identify hazards and take corrective action
D. Train all workers on-site
✔ Correct Answer: C. Identify hazards and take corrective action
The competent person must be capable of recognizing hazards and has
authority to eliminate them immediately to ensure worker safety.
2. At what depth is a protective system required in an excavation?
A. 3 feet
B. 4 feet
C. 5 feet
D. 6 feet
✔ Correct Answer: C. 5 feet
OSHA standards require protective systems in trenches 5 feet or deeper
unless excavation is entirely in stable rock.
3. Which soil type is the most stable?
A. Type A
B. Type B
C. Type C
D. Sandy soil
, ✔ Correct Answer: A. Type A
Type A soil has the highest compressive strength and is the most stable
classification.
4. Which protective system involves cutting back trench walls at an angle?
A. Shielding
B. Benching
C. Sloping
D. Shoring
✔ Correct Answer: C. Sloping
Sloping reduces the risk of collapse by angling trench walls away from the
excavation.
5. What is the minimum safe distance for spoil piles from the trench edge?
A. 1 foot
B. 2 feet
C. 3 feet
D. 4 feet
✔ Correct Answer: B. 2 feet
Keeping spoil piles at least 2 feet from the edge prevents added pressure
and potential cave-ins.
6. Which hazard is most likely to cause fatalities in trenching operations?
A. Equipment failure
B. Cave-ins
C. Noise exposure
D. Dust inhalation
✔ Correct Answer: B. Cave-ins
Cave-ins are the leading cause of death in trenching due to sudden soil
collapse.
7. When must trenches be inspected by a competent person?
A. Weekly
B. Before each shift and after hazards occur
, C. Monthly
D. Only after rain
✔ Correct Answer: B. Before each shift and after hazards occur
Frequent inspections ensure changing conditions do not introduce new
risks.
8. What is required for trenches deeper than 4 feet?
A. Guardrails
B. Ladders or safe access
C. Lighting
D. Fencing
✔ Correct Answer: B. Ladders or safe access
Safe entry and exit must be provided within 25 feet of workers.
9. Which soil type is the least stable?
A. Type A
B. Type B
C. Type C
D. Clay
✔ Correct Answer: C. Type C
Type C soil is the weakest and most prone to collapse.
10.What is benching NOT allowed in?
A. Type A soil
B. Type B soil
C. Type C soil
D. Dry soil
✔ Correct Answer: C. Type C soil
Type C soil is too unstable for benching methods.
11.A trench collapses after rainfall. What should the competent person do
first?
A. Resume work immediately
B. Reclassify soil and reassess protection
PRACTICE EXAM NEWEST (2025 - 2026 UPDATE) FROM
REAL PAST PAPERS QUESTIONS – SET 100 MOST
COMMON EXAM FREQUENTLY TESTED QUESTIONS AND
ANSWERS IN DETAILS 100% VERIFIED EXAM HIGHLY
RECOMMENDABLE FOR GRADE A+
1. What is the primary responsibility of a competent person on a trenching
site?
A. Operate heavy machinery
B. Design excavation equipment
C. Identify hazards and take corrective action
D. Train all workers on-site
✔ Correct Answer: C. Identify hazards and take corrective action
The competent person must be capable of recognizing hazards and has
authority to eliminate them immediately to ensure worker safety.
2. At what depth is a protective system required in an excavation?
A. 3 feet
B. 4 feet
C. 5 feet
D. 6 feet
✔ Correct Answer: C. 5 feet
OSHA standards require protective systems in trenches 5 feet or deeper
unless excavation is entirely in stable rock.
3. Which soil type is the most stable?
A. Type A
B. Type B
C. Type C
D. Sandy soil
, ✔ Correct Answer: A. Type A
Type A soil has the highest compressive strength and is the most stable
classification.
4. Which protective system involves cutting back trench walls at an angle?
A. Shielding
B. Benching
C. Sloping
D. Shoring
✔ Correct Answer: C. Sloping
Sloping reduces the risk of collapse by angling trench walls away from the
excavation.
5. What is the minimum safe distance for spoil piles from the trench edge?
A. 1 foot
B. 2 feet
C. 3 feet
D. 4 feet
✔ Correct Answer: B. 2 feet
Keeping spoil piles at least 2 feet from the edge prevents added pressure
and potential cave-ins.
6. Which hazard is most likely to cause fatalities in trenching operations?
A. Equipment failure
B. Cave-ins
C. Noise exposure
D. Dust inhalation
✔ Correct Answer: B. Cave-ins
Cave-ins are the leading cause of death in trenching due to sudden soil
collapse.
7. When must trenches be inspected by a competent person?
A. Weekly
B. Before each shift and after hazards occur
, C. Monthly
D. Only after rain
✔ Correct Answer: B. Before each shift and after hazards occur
Frequent inspections ensure changing conditions do not introduce new
risks.
8. What is required for trenches deeper than 4 feet?
A. Guardrails
B. Ladders or safe access
C. Lighting
D. Fencing
✔ Correct Answer: B. Ladders or safe access
Safe entry and exit must be provided within 25 feet of workers.
9. Which soil type is the least stable?
A. Type A
B. Type B
C. Type C
D. Clay
✔ Correct Answer: C. Type C
Type C soil is the weakest and most prone to collapse.
10.What is benching NOT allowed in?
A. Type A soil
B. Type B soil
C. Type C soil
D. Dry soil
✔ Correct Answer: C. Type C soil
Type C soil is too unstable for benching methods.
11.A trench collapses after rainfall. What should the competent person do
first?
A. Resume work immediately
B. Reclassify soil and reassess protection
