AR SF Scaffold Installation Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which type of scaffold is most suitable for uneven ground?
A. Suspended scaffold
B. Adjustable base scaffold
C. Cantilever scaffold
D. Supported scaffold
Rationale: Adjustable base scaffolds allow for leveling on uneven
surfaces, providing stability and safety.
2. OSHA requires scaffold platforms to support at least what percentage
of the maximum intended load?
A. 50%
B. 75%
C. 100%
D. 125%
Rationale: Scaffold platforms must support their maximum intended
load to prevent collapse.
3. Which of the following is NOT a common scaffold hazard?
A. Falls
B. Falling objects
C. Electrocution
D. Overheating
, Rationale: Overheating is not a typical scaffold hazard, whereas falls,
falling objects, and electrocution are significant risks.
4. How often should scaffolds be inspected?
A. Weekly
B. Monthly
C. Before each work shift
D. Only after installation
Rationale: OSHA requires scaffolds to be inspected before each shift
and after any event that could affect structural integrity.
5. Guardrails on a scaffold must be installed at what minimum height?
A. 20 inches
B. 28 inches
C. 42 inches
D. 60 inches
Rationale: OSHA specifies a standard guardrail height of 42 inches,
plus or minus 3 inches.
6. Which type of scaffold allows workers to suspend platforms from
overhead structures?
A. Supported scaffold
B. Rolling scaffold
C. Suspended scaffold
D. Ladder jack scaffold
Rationale: Suspended scaffolds are hung from structures, allowing
elevation without ground support.
7. What is the minimum platform width for a scaffold intended for one
worker?
A. 12 inches
B. 18 inches
C. 19 inches
D. 24 inches
Rationale: OSHA specifies a minimum platform width of 19 inches
for single-worker scaffolds.
8. Which scaffold component prevents lateral movement?
A. Toe board
B. Base plate
C. Cross-bracing
D. Guardrail
, Rationale: Cross-braces provide lateral stability, reducing the risk of
scaffold collapse.
9. What is the primary purpose of a toe board?
A. To support workers
B. To level the scaffold
C. To prevent tools or materials from falling
D. To attach guardrails
Rationale: Toe boards act as barriers along the edge of platforms to
stop objects from falling.
10. When using a mobile scaffold, which of the following is
essential?
A. Locking wheels
B. Excessive overloading
C. Using on slopes
D. Moving while loaded
Rationale: Mobile scaffolds must have wheels locked before use to
prevent accidental movement.
11. What is the maximum allowable span for a scaffold platform
without additional support?
A. 4 feet
B. 6 feet
C. 10 feet
D. 12 feet
Rationale: OSHA standards limit unsupported spans to 10 feet for
typical plank scaffolds.
12. Which scaffold requires a competent person to supervise erection
and dismantling?
A. Ladder scaffold
B. All scaffolds over 10 feet
C. Rolling scaffold under 6 feet
D. Masonry scaffold
Rationale: OSHA mandates competent supervision for any scaffold
over 10 feet to ensure safety.
13. The term “competent person” in scaffold work refers to someone
who:
A. Can climb scaffolds
B. Works as a laborer
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which type of scaffold is most suitable for uneven ground?
A. Suspended scaffold
B. Adjustable base scaffold
C. Cantilever scaffold
D. Supported scaffold
Rationale: Adjustable base scaffolds allow for leveling on uneven
surfaces, providing stability and safety.
2. OSHA requires scaffold platforms to support at least what percentage
of the maximum intended load?
A. 50%
B. 75%
C. 100%
D. 125%
Rationale: Scaffold platforms must support their maximum intended
load to prevent collapse.
3. Which of the following is NOT a common scaffold hazard?
A. Falls
B. Falling objects
C. Electrocution
D. Overheating
, Rationale: Overheating is not a typical scaffold hazard, whereas falls,
falling objects, and electrocution are significant risks.
4. How often should scaffolds be inspected?
A. Weekly
B. Monthly
C. Before each work shift
D. Only after installation
Rationale: OSHA requires scaffolds to be inspected before each shift
and after any event that could affect structural integrity.
5. Guardrails on a scaffold must be installed at what minimum height?
A. 20 inches
B. 28 inches
C. 42 inches
D. 60 inches
Rationale: OSHA specifies a standard guardrail height of 42 inches,
plus or minus 3 inches.
6. Which type of scaffold allows workers to suspend platforms from
overhead structures?
A. Supported scaffold
B. Rolling scaffold
C. Suspended scaffold
D. Ladder jack scaffold
Rationale: Suspended scaffolds are hung from structures, allowing
elevation without ground support.
7. What is the minimum platform width for a scaffold intended for one
worker?
A. 12 inches
B. 18 inches
C. 19 inches
D. 24 inches
Rationale: OSHA specifies a minimum platform width of 19 inches
for single-worker scaffolds.
8. Which scaffold component prevents lateral movement?
A. Toe board
B. Base plate
C. Cross-bracing
D. Guardrail
, Rationale: Cross-braces provide lateral stability, reducing the risk of
scaffold collapse.
9. What is the primary purpose of a toe board?
A. To support workers
B. To level the scaffold
C. To prevent tools or materials from falling
D. To attach guardrails
Rationale: Toe boards act as barriers along the edge of platforms to
stop objects from falling.
10. When using a mobile scaffold, which of the following is
essential?
A. Locking wheels
B. Excessive overloading
C. Using on slopes
D. Moving while loaded
Rationale: Mobile scaffolds must have wheels locked before use to
prevent accidental movement.
11. What is the maximum allowable span for a scaffold platform
without additional support?
A. 4 feet
B. 6 feet
C. 10 feet
D. 12 feet
Rationale: OSHA standards limit unsupported spans to 10 feet for
typical plank scaffolds.
12. Which scaffold requires a competent person to supervise erection
and dismantling?
A. Ladder scaffold
B. All scaffolds over 10 feet
C. Rolling scaffold under 6 feet
D. Masonry scaffold
Rationale: OSHA mandates competent supervision for any scaffold
over 10 feet to ensure safety.
13. The term “competent person” in scaffold work refers to someone
who:
A. Can climb scaffolds
B. Works as a laborer
