Certified Safety Professional Exam Ergonomics and Human Factors 1 — Questions and Answers
Question 1: Which risk factor is most commonly associated with the development of work-related musculoskeletal disorders (WMSDs)?
- High illuminance levels
- Repetitive motion, forceful exertion, and awkward postures (Correct answer)
- Excessive noise exposure above 85 dBA
- Prolonged exposure to vibration above 100 Hz
Correct answer: Repetitive motion, forceful exertion, and awkward postures
Repetition, force, and awkward posture are the primary ergonomic risk factors that contribute to musculoskeletal disorders such as carpal tunnel syndrome and tendinitis.
Question 2: What ergonomic tool does NIOSH provide to assess manual material handling tasks and determine a recommended weight limit (RWL)?
- Rapid Upper Limb Assessment (RULA)
- The NIOSH Lifting Equation (Correct answer)
- Rapid Entire Body Assessment (REBA)
- Strain Index (SI)
Correct answer: The NIOSH Lifting Equation
The revised NIOSH Lifting Equation calculates a Recommended Weight Limit and Lifting Index to evaluate two-handed manual lifting tasks.
Question 3: What does a Lifting Index (LI) greater than 1.0 indicate when using the NIOSH Lifting Equation?
- The task is within safe lifting limits
- The task poses an increased risk of low back injury for some workers (Correct answer)
- The task is classified as light work
- Mechanical assists are legally required
Correct answer: The task poses an increased risk of low back injury for some workers
An LI > 1.0 means the load exceeds the recommended weight limit, indicating elevated musculoskeletal injury risk that warrants job redesign.
Question 4: Which type of vibration is associated with Raynaud's phenomenon (vibration white finger) in workers?
- Whole-body vibration (WBV)
- Hand-arm vibration (HAV) (Correct answer)
- Rotational vibration
- Infrasonic vibration
Correct answer: Hand-arm vibration (HAV)
Hand-arm vibration from power tools causes vibration-induced white finger (VWF) by damaging peripheral blood vessels and nerves in the hands.
Question 5: In ergonomic workstation design, what is the recommended monitor height to reduce neck strain?
- Monitor top at eye level or slightly below (Correct answer)
- Monitor centered 10 inches above eye level
- Monitor at desktop level
- Monitor top 12 inches above the crown of the head
Correct answer: Monitor top at eye level or slightly below
The top of the monitor screen should be at or slightly below eye level so the user maintains a neutral head and neck posture while working.
Question 6: What is the primary goal of participatory ergonomics programs?
- To replace all workers with automated machinery
- To involve employees in identifying hazards and designing ergonomic solutions (Correct answer)
- To mandate PPE use for all physical tasks
- To conduct annual physical fitness testing
Correct answer: To involve employees in identifying hazards and designing ergonomic solutions
Participatory ergonomics engages workers who perform the tasks in hazard identification and solution development, improving both effectiveness and acceptance of changes.
Certified Safety Professional Exam Ergonomics and Human Factors 1
Which risk factor is most commonly associated with the development of work-related musculoskeletal disorders (WMSDs)?