CSCS High-Risk Activities 4 — Questions and Answers
Question 1: What is the minimum height at which OSHA requires fall protection for general construction workers?
- 4 feet
- 6 feet (Correct answer)
- 8 feet
- 10 feet
Correct answer: 6 feet
OSHA 29 CFR 1926.502 requires fall protection for construction workers when working at heights of 6 feet or more above a lower level.
Question 2: Which of the following is a leading indicator of risk on a demolition project?
- Number of injuries recorded last quarter
- Presence of unidentified structures not on the demolition plan (Correct answer)
- Time elapsed since the last incident
- Worker compensation claim frequency
Correct answer: Presence of unidentified structures not on the demolition plan
Unidentified structural elements pose unpredictable collapse hazards; identifying them before demolition begins is a critical proactive risk control.
Question 3: What does a Safety Data Sheet (SDS) Section 4 cover for a hazardous substance used in construction?
- First aid measures (Correct answer)
- Fire-fighting measures
- Physical and chemical properties
- Exposure controls
Correct answer: First aid measures
Section 4 of an SDS is dedicated to first aid measures, describing actions to take if a worker is exposed to the substance.
Question 4: A worker is instructed to enter a manhole with no ventilation equipment available. What should the worker do?
- Enter quickly and complete the work before gas builds up
- Refuse entry and report the lack of adequate controls to a supervisor (Correct answer)
- Hold their breath and enter for short periods only
- Prop the cover partially open for natural ventilation
Correct answer: Refuse entry and report the lack of adequate controls to a supervisor
Entering a confined space without proper atmospheric testing and ventilation is life-threatening; workers have the right and responsibility to refuse unsafe work.
Question 5: What is the purpose of exclusion zones during crane operations?
- To designate areas where crane operators must rest
- To prevent unauthorized personnel from entering the area of potential load drop or crane failure (Correct answer)
- To mark where the crane outriggers are positioned
- To identify where workers should stand to watch the lift
Correct answer: To prevent unauthorized personnel from entering the area of potential load drop or crane failure
Exclusion zones protect workers from the risk of a dropped load, rope failure, or crane collapse during lifting operations.
Question 6: Which type of extinguisher is appropriate for a fire involving live electrical equipment on a construction site?
- Class A water extinguisher
- CO2 (carbon dioxide) extinguisher (Correct answer)
- Class B foam extinguisher
- Wet chemical extinguisher
Correct answer: CO2 (carbon dioxide) extinguisher
CO2 extinguishers are non-conductive and safe to use on live electrical fires; water and foam conduct electricity and are dangerous near live equipment.
Question 7: Before lifting a load manually on a construction site, which factor should be assessed FIRST?
- Whether gloves are available
- The weight, shape, and stability of the load and the path of travel (Correct answer)
- How long the task is expected to take
- Whether a coworker is nearby to watch
Correct answer: The weight, shape, and stability of the load and the path of travel
A manual handling risk assessment must evaluate the load's weight, bulk, and grip points, along with the route, to determine the safest method of handling.
CSCS High-Risk Activities 4
What is the minimum height at which OSHA requires fall protection for general construction workers?