Certified Safety Professional Exam Ergonomics and Human Factors 3

Question 1

Which cognitive human factors concept explains why workers make errors even when they know the correct procedure?

Accepted Answer

Skill-based behavior slips and lapses

Answer

Knowledge-based mistakes

Answer

Violation of written procedures

Answer

Fatigue-induced negligence

Question 2

What is the recommended maximum sustained force for a pushing or pulling task to stay within acceptable ergonomic limits for most workers?

Accepted Answer

50 lbs initial/35 lbs sustained

Answer

10 lbs initial/7 lbs sustained

Answer

100 lbs initial/75 lbs sustained

Answer

25 lbs initial/15 lbs sustained

Question 3

In ergonomic risk assessment, what does the Strain Index (SI) specifically evaluate?

Accepted Answer

Distal upper extremity disorders associated with hand-intensive jobs

Answer

Whole-body posture during lifting tasks

Answer

Lower extremity fatigue in standing workers

Answer

Spinal compressive forces during pulling tasks

Question 4

What is the relationship between keyboard height and carpal tunnel syndrome prevention?

Accepted Answer

Keyboards at or slightly below elbow height promote neutral wrist posture

Answer

Higher keyboards reduce wrist extension strain

Answer

Keyboard height has no effect on wrist position

Answer

Wrist rests eliminate the need for proper keyboard height

Question 5

Which ergonomic intervention is most appropriate when the weight of parts in an assembly task exceeds safe manual handling limits?

Accepted Answer

Installation of mechanical assists such as balancers, hoists, or lift tables

Answer

Mandatory wrist braces for all workers

Answer

Job rotation every 30 minutes

Answer

Administrative limit of 2-hour maximum shifts

Question 6

What is 'neutral posture' in ergonomics?

Accepted Answer

The body position that places minimum stress on joints, muscles, and tendons

Answer

The position in which a joint is at maximum extension

Answer

A completely relaxed, stationary body position

Answer

The posture adopted during maximum-effort exertion