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CSCS Scaffolding Basic practice questions

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Question 1Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Under OSHA scaffolding rules, at what minimum height above a lower level must a scaffold be equipped with guardrails, midrails, and toeboards?

  1. 15 feet
  2. 10 feet Correct answer.
  3. 4 feet
  4. 6 feet

Explanation

OSHA requires fall protection, including guardrail systems with midrails and toeboards, on scaffolds where the platform is 10 feet or more above a lower level. Below that height, other hazards may still require protection.

Question 2Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the maximum intended load capacity of a light-duty scaffold?

  1. 50 pounds per square foot
  2. 100 pounds per square foot
  3. 25 pounds per square foot Correct answer.
  4. 75 pounds per square foot

Explanation

Scaffold duty ratings are expressed in pounds per square foot of platform area: light duty is 25 psf, medium duty is 50 psf, and heavy duty is 75 psf.

Question 3Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which term describes the horizontal structural member that supports the scaffold platform?

  1. Standard
  2. Transom Correct answer.
  3. Ledger
  4. Sole board

Explanation

A transom is a horizontal member placed across the width of the scaffold that directly supports the platform. Ledgers run lengthwise, standards are the vertical posts, and sole boards distribute load at the base.

Question 4Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the standard spacing for scaffold tie-ins in both horizontal and vertical directions when no engineering design specifies otherwise?

  1. Every 10 feet horizontally and 10 feet vertically
  2. Every 25 feet horizontally and 15 feet vertically
  3. Every 20 feet horizontally and 20 feet vertically
  4. Every 30 feet horizontally and 26 feet vertically Correct answer.

Explanation

OSHA requires ties to be installed at horizontal intervals of 30 feet and vertical intervals of 26 feet or less when the scaffold is not engineered otherwise. Closer spacing is required for taller or exposed scaffolds.

Question 5Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which footing condition is acceptable for placing a scaffold base plate?

  1. Frozen ground that will thaw during the shift
  2. A firm, level surface capable of supporting the loaded legs Correct answer.
  3. Loose fill that has been hand tamped
  4. A sloped surface with the base plate wedged on one side

Explanation

Scaffold legs must bear on base plates or screw jacks resting on a firm, level foundation that can carry the maximum intended load. Unstable or sloped surfaces require adjustment or engineered support before erection.

Question 6Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the maximum allowable gap between a scaffold platform and the structure it is erected against?

  1. 24 inches
  2. 18 inches Correct answer.
  3. 6 inches
  4. 12 inches

Explanation

Platforms must be no more than 18 inches from the face of the work unless guardrails or personal fall arrest systems protect the open side. Larger gaps create fall and material-drop hazards.

Question 7Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the minimum full plank thickness for scaffold platforms constructed of solid sawn lumber?

  1. 1-1/4 inches
  2. 2-1/2 inches
  3. 1 inch
  4. 2 inches Correct answer.

Explanation

OSHA requires platform planks to be at least 2 inches thick (nominal 2-inch lumber) when using solid sawn wood, and the span must be appropriate for the plank grade and load.

Question 8Scaffolding Fundamentals, Terminology, and Regulatory Requirements

How should scaffold platforms be overlapped when planks are placed end to end?

  1. Planks must overlap at least 6 inches and rest on a single support
  2. Planks must overlap at least 12 inches and be secured against movement Correct answer.
  3. Planks may be spliced with nails driven through the ends
  4. Planks must be butted tightly with no overlap

Explanation

End-to-end planks must overlap a minimum of 12 inches and be restrained from movement, or be secured by cleats, so that the platform cannot shift or separate under load.

Question 9Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which access method is permitted for a scaffold?

  1. Climbing the end frames
  2. A ladder or stairway designed into the scaffold system Correct answer.
  3. Climbing the crossbraces
  4. A portable ladder placed on the platform

Explanation

Workers must use a ladder, stairway, ramp, or walkway intended for access, and the access must be within the scaffold or attached to it. Climbing structural members is prohibited.

Question 10Scaffolding Fundamentals, Terminology, and Regulatory Requirements

When a scaffold platform is more than 10 feet above a lower level, what must be provided along the open sides?

  1. A guardrail system with toprail, midrail, and toeboard Correct answer.
  2. A warning line only
  3. A personal fall arrest system with no guardrail
  4. A safety net under the platform

Explanation

Open sides and ends of scaffold platforms at or above the 10-foot threshold require a complete guardrail system including toprail, midrail, and toeboard. Personal fall arrest alone is not a substitute where guardrails are feasible.

Question 11Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the minimum height above the platform for the toprail of a scaffold guardrail system?

  1. 30 inches
  2. 42 inches Correct answer.
  3. 48 inches
  4. 36 inches

Explanation

Scaffold toprails must be installed between 38 and 45 inches above the platform surface, with 42 inches as the standard target height. Midrails are placed midway between the toprail and the platform.

Question 12Scaffolding Fundamentals, Terminology, and Regulatory Requirements

How much vertical clearance must be maintained between the scaffold platform and energized power lines rated up to 50 kV?

  1. 3 feet
  2. 10 feet Correct answer.
  3. 15 feet
  4. 5 feet

Explanation

OSHA requires a minimum 10-foot clearance from energized lines rated up to 50 kV, with additional clearance for higher voltages. Scaffolds must be relocated or lines de-energized if clearance cannot be met.

Question 13Scaffolding Fundamentals, Terminology, and Regulatory Requirements

A scaffold is to be moved horizontally on casters while workers remain on the platform. Which condition must be met?

  1. The scaffold must be moved only by one person at the base
  2. The scaffold must be moved only on a level surface with the workers remaining aboard Correct answer.
  3. The scaffold must be moved at walking speed with no special precautions
  4. The scaffold must have outriggers removed to reduce weight

Explanation

Mobile scaffolds may be moved with workers aboard only on level, smooth surfaces, and the surface must be capable of supporting the load. The scaffold must be braced and casters locked before work resumes.

Question 14Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the maximum height-to-base-width ratio for a freestanding, non-tied scaffold?

  1. 2 to 1
  2. 3 to 1
  3. 4 to 1 Correct answer.
  4. 6 to 1

Explanation

A freestanding scaffold must not exceed a 4-to-1 height-to-base ratio unless it is restrained by guying, tying, or outriggers. Exceeding the ratio creates an overturning hazard.

Question 15Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which component is designed to prevent a scaffold from tipping outward away from the structure?

  1. Toeboard
  2. Tie or guy Correct answer.
  3. Guardrail
  4. Sole board

Explanation

Ties and guys anchor the scaffold to the structure or to the ground to resist horizontal and overturning forces. Sole boards, guardrails, and toeboards serve other functions.

Question 16Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the purpose of a scaffold's base plate or screw jack?

  1. To connect the standards to the ledgers
  2. To support the toeboard
  3. To anchor the guardrail posts
  4. To level the scaffold and distribute load to the foundation Correct answer.

Explanation

Base plates and screw jacks bear on the foundation, allow the scaffold to be leveled, and spread the leg load over a larger area. They are used together with sole boards when needed.

Question 17Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which statement accurately describes the difference between a putlog scaffold and an independent scaffold?

  1. A putlog scaffold has no standards; an independent scaffold has no ledgers
  2. A putlog scaffold is used only indoors; an independent scaffold is used only outdoors
  3. A putlog scaffold relies on the structure for support; an independent scaffold is self-supporting Correct answer.
  4. A putlog scaffold is always made of steel; an independent scaffold is always wood

Explanation

Putlog scaffolds use putlogs that bear in the wall to support the platform, so the structure carries part of the load. Independent scaffolds stand on their own standards and base plates and do not rely on the building for support.

Question 18Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the minimum number of points at which a scaffold must be tied to a structure?

  1. Two points, one at each end Correct answer.
  2. Three points
  3. One point
  4. Four points

Explanation

A scaffold must be tied to the structure at a minimum of two points, one near each end, to resist horizontal displacement. Additional ties are required at the spacing intervals set by the standard.

Question 19Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which of these is the correct description of a 'standard' in scaffold terminology?

  1. A platform plank
  2. A vertical load-bearing member Correct answer.
  3. A diagonal member providing rigidity
  4. A horizontal member supporting the platform

Explanation

A standard is a vertical post that transmits the platform load to the base and foundation. Horizontal members are ledgers and transoms, diagonal members are braces, and planks form the platform.

Question 20Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the required minimum height for a toeboard on a scaffold platform?

  1. 2 inches
  2. 8 inches
  3. 4 inches Correct answer.
  4. 6 inches

Explanation

Toeboards must be at least 4 inches high, with no more than a 1/4-inch gap above the platform, to prevent tools and materials from falling off the edge.

Question 21Scaffolding Fundamentals, Terminology, and Regulatory Requirements

A scaffold platform is 14 feet above the ground and has a 20-inch gap between the platform edge and the building. Which corrective action is required?

  1. No action is needed because the gap is less than 2 feet
  2. Add a second toeboard
  3. Reduce the gap to 24 inches
  4. Install a guardrail or personal fall arrest system on the open side Correct answer.

Explanation

Platforms more than 18 inches from the work face require guardrails or personal fall arrest on the open side. A 20-inch gap exceeds the 18-inch limit, so fall protection must be provided.

Question 22Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which factor most directly determines the maximum span of a scaffold plank between supports?

  1. The height of the scaffold
  2. The number of workers on the platform
  3. The color of the plank
  4. The plank material, thickness, and grade Correct answer.

Explanation

Plank span capacity depends on the material, thickness, grade, and the load it must carry. Manufacturer tables and the scaffold standard set allowable spans for each plank type.

Question 23Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is required before a scaffold is first used on a job site?

  1. It must be inspected only after the first shift of use
  2. It must be painted to improve visibility
  3. It must be approved by the general contractor's insurance carrier
  4. It must be inspected by a competent person and tagged or documented as safe Correct answer.

Explanation

A competent person must inspect the scaffold before each work shift and after any event that could affect its integrity, and the results must be documented. Unsafe scaffolds must be tagged and removed from service.

Question 24Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Under OSHA, who is qualified to design a scaffold and determine its load capacity?

  1. A qualified person such as an engineer or trained designer Correct answer.
  2. The site superintendent
  3. Any worker with more than one year of experience
  4. A competent person only

Explanation

Scaffold design and load determinations must be made by a qualified person with the training, experience, and knowledge to evaluate the structure. A competent person performs inspections and on-site hazard recognition.

Question 25Scaffolding Fundamentals, Terminology, and Regulatory Requirements

A worker must cross a scaffold platform where a gap exists between two sections. What is the acceptable practice?

  1. Use a toeboard laid flat across the gap
  2. Step across the gap while holding the guardrail
  3. Jump over the gap if it is less than 12 inches
  4. Place a secured plank or platform section to span the gap Correct answer.

Explanation

Platforms must be complete and free of openings that could cause a fall. Gaps must be covered with a secured plank or platform section that can carry the load.

Question 26Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the primary purpose of a scaffold's ledger?

  1. To provide lateral stability by tying the scaffold to the structure
  2. To transfer the scaffold load to the ground
  3. To support the platform planks directly
  4. To connect the standards horizontally and support the putlogs or transoms Correct answer.

Explanation

A ledger is a horizontal member that runs parallel to the building face and connects the vertical standards. It supports the transoms or putlogs, which in turn support the platform.

Question 27Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the maximum allowable spacing between scaffold standards for a medium-duty scaffold?

  1. 3.0 meters (10 feet)
  2. 2.7 meters (9 feet)
  3. 1.5 meters (5 feet)
  4. 2.1 meters (7 feet) Correct answer.

Explanation

For a medium-duty scaffold, standards are typically spaced at a maximum of 2.1 meters (7 feet) on center, depending on the design and load requirements. This spacing ensures adequate support for the intended loads.

Question 28Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which type of scaffold is suspended from an overhead structure by ropes or cables?

  1. Suspended scaffold Correct answer.
  2. Putlog scaffold
  3. Birdcage scaffold
  4. Mobile scaffold

Explanation

A suspended scaffold is hung from an overhead structure using ropes or cables, allowing work to be performed at heights without a ground-supported base. This type is commonly used for facade work and maintenance.

Question 29Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the minimum design load that a light-duty scaffold platform must support?

  1. 1.5 kN/m² (30 psf)
  2. 2.0 kN/m² (40 psf)
  3. 1.0 kN/m² (20 psf)
  4. 2.5 kN/m² (50 psf) Correct answer.

Explanation

Light-duty scaffolds are designed for a uniformly distributed load of at least 2.5 kN/m² (50 psf) to accommodate workers and light tools. This load rating ensures safety for the intended light work.

Question 30Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the minimum height of a toeboard on a scaffold platform?

  1. 10 inches (25 cm)
  2. 4 inches (10 cm) Correct answer.
  3. 8 inches (20 cm)
  4. 6 inches (15 cm)

Explanation

OSHA requires toeboards to be at least 4 inches (10 cm) in height to prevent tools and materials from falling off the platform. This minimum helps contain small objects.

Question 31Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which of the following is a required component of a scaffold's foundation?

  1. Guardrails
  2. Screw jacks
  3. Base plates
  4. Mudsills Correct answer.

Explanation

Mudsills are required to distribute the scaffold load over a larger area when the scaffold is erected on soil or other uneven surfaces. They prevent the base plates from sinking.

Question 32Scaffolding Fundamentals, Terminology, and Regulatory Requirements

A scaffold is to be erected on a concrete slab. What is the minimum required compressive strength of the concrete to support the scaffold's base plates?

  1. 1,000 psi
  2. 3,000 psi Correct answer.
  3. 4,000 psi
  4. 2,000 psi

Explanation

Concrete must have a minimum compressive strength of 3,000 psi to support scaffold base plates without risk of crushing or settlement. This ensures a stable foundation.

Question 33Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the maximum allowable deflection for a scaffold platform plank under load?

  1. 1/60 of the span Correct answer.
  2. 1/100 of the span
  3. 1/120 of the span
  4. 1/150 of the span

Explanation

Scaffold planks should not deflect more than 1/60 of the span to maintain a safe and stable walking surface. Excessive deflection can cause tripping and structural issues.

Question 34Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which of the following is a safe practice when erecting a scaffold near a public sidewalk?

  1. Erect the scaffold without any overhead protection
  2. Use warning signs only, without physical barriers
  3. Allow pedestrians to walk under the scaffold during erection
  4. Install a protective canopy or barricade to divert pedestrians Correct answer.

Explanation

When scaffolds are erected near public areas, a protective canopy or barricade must be installed to protect pedestrians from falling objects. This is a standard safety requirement.

Question 35Scaffolding Fundamentals, Terminology, and Regulatory Requirements

What is the minimum number of ladders required for a scaffold that is 30 feet high?

  1. Three
  2. Two
  3. Four
  4. One Correct answer.

Explanation

A single ladder is sufficient for a 30-foot scaffold as long as it is properly secured and extends at least 3 feet above the platform. The number of ladders is not determined by height alone.

Question 36Scaffolding Fundamentals, Terminology, and Regulatory Requirements

Which factor is most critical in determining the safe working load of a scaffold?

  1. The type of base plates used
  2. The color of the scaffold components
  3. The number of workers on the platform
  4. The spacing of the standards and ledgers Correct answer.

Explanation

The spacing of standards and ledgers directly affects the load-carrying capacity of the scaffold. Closer spacing increases strength and allows for higher loads.

Question 37Scaffold Loads, Structural Analysis, and Design Considerations

What is the standard design live load for a light-duty scaffold used by workers and hand tools only?

  1. 50 psf (2.4 kN/m²)
  2. 75 psf (3.6 kN/m²)
  3. 100 psf (4.8 kN/m²)
  4. 25 psf (1.2 kN/m²) Correct answer.

Explanation

Light-duty scaffolds are intended for workers and small hand tools, and the recognized design live load for this duty rating is 25 psf. Higher values correspond to heavier duty classifications.

Question 38Scaffold Loads, Structural Analysis, and Design Considerations

Dead load in a scaffold design refers to which of the following?

  1. The self-weight of the scaffold components and any permanently attached items Correct answer.
  2. Wind pressure acting on the scaffold sheeting
  3. Impact forces from dropped materials
  4. The weight of workers and their tools

Explanation

Dead load is the permanent, static weight of the structure itself, including planks, frames, and attached items. Worker and tool weight is live load, and wind is a separate environmental load case.

Question 39Scaffold Loads, Structural Analysis, and Design Considerations

Why must scaffold legs be set on base plates and mudsills on firm ground?

  1. To comply with fall-protection anchorage rules
  2. To provide a mounting point for outriggers
  3. To distribute the leg load over a larger bearing area and limit settlement Correct answer.
  4. To increase the working height of the scaffold

Explanation

Base plates and mudsills spread the concentrated leg load over a larger soil area, reducing bearing pressure and preventing differential settlement. Settlement can induce unintended forces and instability.

Question 40Scaffold Loads, Structural Analysis, and Design Considerations

A scaffold is to be used for bricklaying with masonry units and mortar stored on the platform. Which duty rating applies?

  1. Heavy duty Correct answer.
  2. Medium duty
  3. Light duty
  4. Special duty

Explanation

Heavy-duty scaffolds are rated for masonry work where materials are stockpiled on the platform, corresponding to a 75 psf live load. Medium duty is for bricklaying without significant stockpiling.

Question 41Scaffold Loads, Structural Analysis, and Design Considerations

Which load type is most commonly the governing lateral load in the design of a freestanding scaffold?

  1. Seismic load
  2. Thermal expansion
  3. Wind load Correct answer.
  4. Live load from workers

Explanation

Wind produces significant lateral pressure on scaffold sheeting and framing and typically governs lateral design for freestanding scaffolds. Seismic and thermal effects are usually secondary for temporary structures.

Question 42Scaffold Loads, Structural Analysis, and Design Considerations

What is the primary purpose of cross-bracing in a scaffold bay?

  1. To carry the vertical leg loads to the ground
  2. To provide lateral stability and resist racking of the frame Correct answer.
  3. To support the toe boards
  4. To increase the platform's live load rating

Explanation

Cross-bracing forms a triangulated system that resists racking and provides lateral stiffness. Vertical loads are carried by the legs, not the bracing.

Question 43Scaffold Loads, Structural Analysis, and Design Considerations

Which factor most directly reduces the load-carrying capacity of a scaffold leg?

  1. Painting the leg
  2. Increasing the leg's unsupported length Correct answer.
  3. Increasing the platform width
  4. Adding toe boards

Explanation

A longer unsupported length increases the slenderness of a compression member and reduces its buckling capacity. Coatings, platform width, and toe boards do not materially change leg capacity.

Question 44Scaffold Loads, Structural Analysis, and Design Considerations

What does a factor of safety in scaffold design account for?

  1. Only the cost of materials
  2. The number of workers on the platform
  3. The color coding of scaffold components
  4. Uncertainties in loads, material strength, and construction tolerances Correct answer.

Explanation

A factor of safety provides margin against uncertainties in loading, material behavior, workmanship, and analysis assumptions. It is not tied to cost, occupancy, or component identification.

Question 45Scaffold Loads, Structural Analysis, and Design Considerations

A scaffold bay is 7 ft wide and 5 ft deep, and is rated light duty. What total live load should the platform be designed to carry?

  1. 2,450 lb
  2. 1,750 lb
  3. 1,225 lb
  4. 875 lb Correct answer.

Explanation

Light duty corresponds to 25 psf. The platform area is 7 ft × 5 ft = 35 ft², so the design live load is 25 × 35 = 875 lb.

Question 46Scaffold Loads, Structural Analysis, and Design Considerations

A scaffold leg carries a factored axial load of 4,000 lb. If the leg's allowable compressive capacity is 8,000 lb, what is the utilization ratio?

  1. 0.75
  2. 0.50 Correct answer.
  3. 0.25
  4. 2.00

Explanation

The utilization ratio is the applied load divided by capacity: 4,000 / 8,000 = 0.50. A ratio at or below 1.0 indicates the member is adequate.

Question 47Scaffold Loads, Structural Analysis, and Design Considerations

Why is a scaffold tie to a structure important on a tall, sheeted scaffold?

  1. It transfers lateral wind loads to the building and prevents overturning Correct answer.
  2. It increases the platform's live load rating
  3. It allows the scaffold to be moved without dismantling
  4. It supports the mudsills

Explanation

Ties anchor the scaffold to the structure, transferring lateral wind forces into the building and preventing overturning or instability. Ties do not change duty ratings or support foundations.

Question 48Scaffold Loads, Structural Analysis, and Design Considerations

A scaffold platform spans between supports. If the span is doubled with the same uniformly distributed load, how does the bending moment at midspan change?

  1. It quadruples Correct answer.
  2. It doubles
  3. It halves
  4. It stays the same

Explanation

For a simply supported beam, midspan moment under uniform load is wL²/8. Doubling L increases the moment by a factor of four.

Question 49Scaffold Loads, Structural Analysis, and Design Considerations

What is the purpose of a guardrail system on a scaffold?

  1. To resist wind uplift on the scaffold
  2. To carry the platform live load
  3. To support the scaffold ties
  4. To prevent workers and materials from falling from the platform Correct answer.

Explanation

Guardrails provide fall protection by containing workers and preventing materials from falling off the platform. They are not primary structural members for load or wind resistance.

Question 50Scaffold Loads, Structural Analysis, and Design Considerations

Why does the design of a scaffold account for the eccentricity of platform loads relative to the legs?

  1. Because eccentric loads create additional bending moments in the legs and frames Correct answer.
  2. Because it eliminates the need for bracing
  3. Because eccentricity reduces the dead load
  4. Because it changes the duty rating

Explanation

Loads applied away from the leg axis create moments that must be resisted by the frame and bracing. Ignoring eccentricity can underestimate member forces.