CA D39 SCAFFOLDING - And Correct Answers (Verified Answers) Plus Rat...

CA D39 SCAFFOLDING

CONTRACTOR EXAM Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

What is the maximum allowable load for a standard scaffolding platform?

• 100 lbs per square foot
• 200 lbs per square foot
• 250 lbs per square foot
• 300 lbs per square foot

Rationale: Scaffolding platforms are typically designed to support a

maximum load of 250 lbs per square foot to ensure safety.

• Which type of scaffold is most suitable for painting large exterior

walls?

• Suspended scaffold
• Frame scaffold
• Cantilever scaffold
• Mobile scaffold

Rationale: Frame scaffolds provide a wide platform and stable

structure, ideal for painting large areas.

• How often must scaffolding inspections be conducted?
• Weekly
• Before each work shift
• Monthly
• Only after adverse weather conditions 1 / 3

Rationale: OSHA requires scaffolds to be inspected for safety before

each work shift by a competent person.

• What is the minimum width of a scaffolding platform?
• 12 inches
• 18 inches
• 24 inches
• 36 inches

Rationale: A minimum of 18 inches is required to provide adequate

working space and reduce fall risk.

• Which scaffold component prevents tipping?
• Ledger
• Brace
• Base plate
• Coupler

Rationale: Base plates distribute the load and stabilize the scaffold,

preventing tipping.

• Guardrails must be installed at what height on a scaffolding platform?
• 18 inches
• 30 inches
• 42 inches
• 48 inches

Rationale: OSHA mandates guardrails at 42 inches to protect

workers from falls.

• When using suspended scaffolds, which of the following is required?
• Safety harness with lifeline
• Independent support system
• Only base plates
• Ladder access is optional

Rationale: Suspended scaffolds must have independent support

systems to safely carry workers and materials.

• What is the primary purpose of a scaffold tie?
• Increase platform width
• Secure the scaffold to a building or structure
• Support guardrails
• Stabilize base plates

Rationale: Scaffold ties prevent scaffolds from tipping or moving

away from the structure. 2 / 3

• What type of scaffold is most suitable for uneven terrain?
• Suspended scaffold
• Adjustable-frame scaffold
• Cantilever scaffold
• Rolling scaffold

Rationale: Adjustable-frame scaffolds allow height adjustments to

compensate for uneven surfaces.

• Which scaffold type is supported by the ground and not attached to a

building?

• Suspended scaffold
• Cantilever scaffold
• Supported scaffold
• Pump jack scaffold

Rationale: Supported scaffolds rest on the ground or a solid structure

and are not suspended.

• What is the maximum vertical distance between scaffold

platforms?

• 6 feet
• 8 feet
• 10 feet
• 12 feet

Rationale: OSHA allows platforms to be no more than 10 feet apart

vertically to maintain safety.

• Which component connects the scaffold to prevent swaying?
• Base plate
• Diagonal brace
• Ledger
• Coupler

Rationale: Diagonal braces provide lateral stability and prevent

swaying.

12. The minimum overlap of scaffold planks is:

• 3 inches
• 6 inches
• 12 inches
• 18 inches

Rationale: A 12-inch minimum overlap ensures planks are properly

supported and stable.

• / 3