NSC Ergonomics 3

Question 1

Which muscle group is MOST often affected by prolonged static loading during computer work?

Accepted Answer

Trapezius and neck muscles

Answer

The trapezius and cervical muscles sustain prolonged low-level static contraction to hold the head and shoulders in position during desk work.

Question 2

What ergonomic risk factor is associated with using a vibrating tool for extended periods?

Accepted Answer

Hand-arm vibration syndrome (HAVS)

Answer

Hand-arm vibration syndrome (HAVS) causes vascular and neurological damage in the hands and arms from prolonged exposure to vibrating tools.

Question 3

In ergonomic workstation design, what is the recommended distance between the eyes and a computer monitor?

Accepted Answer

20–40 inches

Answer

OSHA and NSC guidelines recommend placing the monitor approximately 20–40 inches from the eyes to reduce eyestrain and neck strain.

Question 4

Which ergonomic hazard category does 'whole-body vibration' (WBV) fall under?

Accepted Answer

Physical ergonomic hazard

Answer

Whole-body vibration is classified as a physical ergonomic hazard, commonly affecting forklift operators and truck drivers.

Question 5

A grocery cashier develops wrist pain after months of scanning products. Which control measure is MOST effective at reducing cumulative trauma?

Accepted Answer

Redesigning the checkout station to reduce reach and wrist angles

Answer

Engineering controls like workstation redesign address the root cause of awkward postures and are more effective than personal protective devices.

NSC Practice Test