LATEST OSHA 30-HOUR CONSTRUCTION
SAFETY AND HEALTH CERTIFICATION
EXAM | Q&A WITH RATIONALES
1. Under OSHA, what is the minimum height at which
fall protection is required for construction workers?
A) 4 feet
B) 6 feet
C) 10 feet
D) 15 feet
Correct answer: B
Rationale: OSHA 1926.501 requires fall protection at
6 feet in construction.
2. The “Focus Four” hazards in construction account
for the majority of fatalities. Which of the following is
NOT one of the Focus Four?
A) Falls
B) Struck‑by
C) Caught‑in/between
D) Chemical exposure
Correct answer: D
,Rationale: The Focus Four are falls, struck‑by,
caught‑in/between, and electrocution.
3. A competent person for excavation must inspect
the trench daily and after every rainstorm. What is
the primary reason for this inspection?
A) To check for proper signage
B) To identify potential cave‑in hazards
C) To measure the width of the trench
D) To ensure workers are wearing hard hats
Correct answer: B
Rationale: Daily inspections identify soil changes,
water accumulation, or other conditions that could
lead to a cave‑in.
4. When using a ladder, the base should be placed 1
foot away from the wall for every 4 feet of ladder
height. This is known as the:
A) 1:4 rule
B) 4:1 rule
C) 1:1 rule
D) 2:1 rule
Correct answer: A
,Rationale: The 1:4 ratio (1 foot of setback for 4 feet of
rise) provides a safe climbing angle.
5. Which of the following is a required component of a
personal fall arrest system (PFAS)?
A) Body belt
B) Shock‑absorbing lanyard
C) Guardrail system
D) Safety net
Correct answer: B
Rationale: A PFAS includes a full body harness, a
connecting device (lanyard with shock absorber),
and an anchor point.
6. Before an employee enters a permit‑required
confined space, the employer must:
A) Issue a confined space entry permit
B) Post a warning sign outside the space
C) Provide a safety harness only
D) Notify OSHA of the entry
Correct answer: A
Rationale: A written entry permit is required for
permit‑required confined spaces.
, 7. What is the maximum allowed gap between a
scaffold platform and the building face?
A) 6 inches
B) 12 inches
C) 14 inches
D) 18 inches
Correct answer: C
Rationale: The gap must not exceed 14 inches to
prevent falls.
8. The OSHA standard requires that all excavations 5
feet or deeper be protected by a protective system
unless the excavation is made entirely in stable rock.
What are the three primary types of protective
systems?
A) Sloping, shoring, and shielding
B) Benching, barricading, and warning lines
C) Guardrails, safety nets, and personal fall arrest
D) Ventilation, illumination, and drainage
Correct answer: A
Rationale: Sloping, shoring, and shielding are the
accepted methods to prevent cave‑ins.
SAFETY AND HEALTH CERTIFICATION
EXAM | Q&A WITH RATIONALES
1. Under OSHA, what is the minimum height at which
fall protection is required for construction workers?
A) 4 feet
B) 6 feet
C) 10 feet
D) 15 feet
Correct answer: B
Rationale: OSHA 1926.501 requires fall protection at
6 feet in construction.
2. The “Focus Four” hazards in construction account
for the majority of fatalities. Which of the following is
NOT one of the Focus Four?
A) Falls
B) Struck‑by
C) Caught‑in/between
D) Chemical exposure
Correct answer: D
,Rationale: The Focus Four are falls, struck‑by,
caught‑in/between, and electrocution.
3. A competent person for excavation must inspect
the trench daily and after every rainstorm. What is
the primary reason for this inspection?
A) To check for proper signage
B) To identify potential cave‑in hazards
C) To measure the width of the trench
D) To ensure workers are wearing hard hats
Correct answer: B
Rationale: Daily inspections identify soil changes,
water accumulation, or other conditions that could
lead to a cave‑in.
4. When using a ladder, the base should be placed 1
foot away from the wall for every 4 feet of ladder
height. This is known as the:
A) 1:4 rule
B) 4:1 rule
C) 1:1 rule
D) 2:1 rule
Correct answer: A
,Rationale: The 1:4 ratio (1 foot of setback for 4 feet of
rise) provides a safe climbing angle.
5. Which of the following is a required component of a
personal fall arrest system (PFAS)?
A) Body belt
B) Shock‑absorbing lanyard
C) Guardrail system
D) Safety net
Correct answer: B
Rationale: A PFAS includes a full body harness, a
connecting device (lanyard with shock absorber),
and an anchor point.
6. Before an employee enters a permit‑required
confined space, the employer must:
A) Issue a confined space entry permit
B) Post a warning sign outside the space
C) Provide a safety harness only
D) Notify OSHA of the entry
Correct answer: A
Rationale: A written entry permit is required for
permit‑required confined spaces.
, 7. What is the maximum allowed gap between a
scaffold platform and the building face?
A) 6 inches
B) 12 inches
C) 14 inches
D) 18 inches
Correct answer: C
Rationale: The gap must not exceed 14 inches to
prevent falls.
8. The OSHA standard requires that all excavations 5
feet or deeper be protected by a protective system
unless the excavation is made entirely in stable rock.
What are the three primary types of protective
systems?
A) Sloping, shoring, and shielding
B) Benching, barricading, and warning lines
C) Guardrails, safety nets, and personal fall arrest
D) Ventilation, illumination, and drainage
Correct answer: A
Rationale: Sloping, shoring, and shielding are the
accepted methods to prevent cave‑ins.
