CSCS High-Risk Activities 5 — Questions and Answers
Question 1: What does a red exclusion zone tag on a scaffold mean?
- The scaffold is complete and fully safe for use
- The scaffold is under construction or has a defect and must not be used (Correct answer)
- Only supervisors are permitted to use the scaffold
- The scaffold requires a harness to be worn at all times
Correct answer: The scaffold is under construction or has a defect and must not be used
A red tag indicates the scaffold is not safe for use due to it being incomplete, damaged, or under inspection.
Question 2: Which document must a worker on a construction site carry to prove competence for high-risk tasks under CSCS requirements?
- A personal identification card issued by their employer
- A CSCS card relevant to their occupation and level of qualification (Correct answer)
- A printed copy of their training certificates
- An OSHA 10-hour course completion card
Correct answer: A CSCS card relevant to their occupation and level of qualification
The CSCS card demonstrates that the holder has the required training and qualifications for their specific construction role.
Question 3: What is the main purpose of a pre-task hazard analysis (also called a Job Hazard Analysis or JHA)?
- To document who performed the work for liability purposes
- To identify hazards and establish controls before a specific task begins (Correct answer)
- To list the tools required for a job
- To record the time workers spend on each activity
Correct answer: To identify hazards and establish controls before a specific task begins
A JHA systematically examines each step of a task to identify hazards and implement controls before work starts, reducing injury risk.
Question 4: When working with power tools near flammable vapors, what type of tool must be used?
- Standard corded electric tools with a ground fault circuit interrupter
- Air-powered (pneumatic) or intrinsically safe explosion-proof tools (Correct answer)
- Battery-operated tools at low speed settings
- Tools rated for outdoor use only
Correct answer: Air-powered (pneumatic) or intrinsically safe explosion-proof tools
In atmospheres containing flammable vapors, only intrinsically safe or explosion-proof tools may be used, as standard electric tools can generate sparks that ignite vapors.
Question 5: A worker discovers a previously unknown underground fuel tank while excavating. What is the correct immediate action?
- Continue digging carefully to expose the tank fully before reporting
- Stop work immediately, clear the area, and report to the supervisor and relevant authorities (Correct answer)
- Probe the tank with a metal rod to assess its condition
- Mark the location with a cone and continue work in adjacent areas
Correct answer: Stop work immediately, clear the area, and report to the supervisor and relevant authorities
An unknown buried fuel tank creates explosion, fire, and contamination risks; work must stop immediately and the hazard reported for specialist assessment.
Question 6: What is the correct sequence when donning (putting on) a full-body fall arrest harness?
- Legs first, then torso, then chest strap, then connect lanyard
- Connect lanyard first, then fit the harness around the body
- Put on the harness, adjust all straps for fit, then inspect and connect the lanyard at the anchor point (Correct answer)
- Inspect the lanyard, then put the harness on without adjusting until at the work location
Correct answer: Put on the harness, adjust all straps for fit, then inspect and connect the lanyard at the anchor point
The correct sequence is to don and adjust the harness for a secure fit on the ground, inspect it, then connect the lanyard to a rated anchor point before working at height.
Question 7: Under what circumstance is it acceptable to override an interlock device on a piece of construction equipment?
- When the task cannot be completed without bypassing it
- When a supervisor verbally authorizes it for a single operation
- It is never acceptable to override a safety interlock device (Correct answer)
- When the interlock is known to be faulty and replacement parts are on order
Correct answer: It is never acceptable to override a safety interlock device
Safety interlocks are engineered barriers that prevent hazardous machine states; bypassing them under any circumstance removes a critical layer of protection and is prohibited.
CSCS High-Risk Activities 5
What does a red exclusion zone tag on a scaffold mean?