Certified Ergonomic Specialist (CES) — Questions and Answers

Question 1: Why is posture evaluation important in ergonomics?

To reduce equipment use
To encourage rigid movement
To increase chair height
To assess strain and injury risks (Correct answer)

Correct answer: To assess strain and injury risks

Evaluating posture is crucial in ergonomics because poor or sustained awkward postures are significant contributors to musculoskeletal strain and injuries. By analyzing how a worker holds their body during tasks, ergonomists can identify positions that place undue stress on muscles, joints, and ligaments. This assessment helps in recommending adjustments to workstations or work methods to promote neutral postures, thereby reducing the risk of discomfort, fatigue, and long-term health issues.

Question 2: Which ANSI standard specifically addresses ergonomics for video display terminal (VDT) workstations?

ANSI A10.32
ANSI Z10
ANSI/AIHA Z9.7
ANSI/HFES 100 (Correct answer)

Correct answer: ANSI/HFES 100

ANSI/HFES 100 (Human Factors Engineering of Computer Workstations) provides standards and guidelines for VDT workstation design including visual, hardware, and environmental elements.

Question 3: Which factor most determines whether a worker requires a headset rather than a standard telephone handset?

Duration and frequency of phone use combined with simultaneous keyboard or writing tasks (Correct answer)
Personal preference for audio quality
Number of employees sharing the phone
Department budget for equipment

Correct answer: Duration and frequency of phone use combined with simultaneous keyboard or writing tasks

Workers who use the phone frequently while simultaneously performing keyboard or writing tasks are at high risk for awkward neck postures and should use a headset.

Question 4: Under OSHA's General Duty Clause, employers are required to:

Follow only published OSHA standards
Hire a certified ergonomist for all facilities
Conduct annual ergonomic assessments
Provide a workplace free from recognized serious hazards, even if no specific standard exists (Correct answer)

Correct answer: Provide a workplace free from recognized serious hazards, even if no specific standard exists

Section 5(a)(1) of the OSH Act requires employers to protect workers from recognized serious hazards, which OSHA uses to address ergonomic risk in the absence of a specific standard.

Question 5: What is a common ergonomic injury?

Sprained ankle
Fracture from fall
Skin irritation
Carpal tunnel syndrome (Correct answer)

Correct answer: Carpal tunnel syndrome

Carpal tunnel syndrome is a classic example of a work-related musculoskeletal disorder (MSD) commonly associated with ergonomic risk factors. It results from compression of the median nerve in the wrist, often caused by repetitive hand and wrist movements, forceful exertions, or prolonged awkward wrist postures. While other options like sprained ankles or fractures are injuries, carpal tunnel syndrome is directly linked to ergonomic stressors in the workplace.

Question 6: The recommended elbow angle when typing at a keyboard is approximately:

90–110° (Correct answer)
70°
45°
130°

Correct answer: 90–110°

Elbows bent at 90–110° with upper arms close to the body and wrists neutral minimizes static shoulder and forearm loading.

Question 7: Participatory ergonomics programs involve workers in the process primarily because:

It reduces the need for certified ergonomists
It is required by federal law
Management prefers not to be involved
Workers have direct knowledge of task demands and practical constraints that improve intervention quality (Correct answer)

Correct answer: Workers have direct knowledge of task demands and practical constraints that improve intervention quality

Workers performing the tasks have firsthand knowledge of variability, workarounds, and practical barriers that ergonomists may not observe, leading to more effective and accepted solutions.

Question 8: A job involves several distinct lifting tasks with different geometries. Which NIOSH metric estimates the overall physical stress of the combined job?

Composite Lifting Index (CLI) (Correct answer)
Strain Index
Frequency-Independent RWL only
Single-task Lifting Index

Correct answer: Composite Lifting Index (CLI)

The Composite Lifting Index combines the indexes of multiple lifting tasks to reflect the overall demand of a multi-task job.

Question 9: Which workstation adjustment is most important for workers whose feet cannot reach the floor when seated at the correct desk height?

Recommend standing instead of sitting
Lower the desk below recommended keyboard height
Provide a footrest to support the feet and reduce lower leg pressure (Correct answer)
Have the worker sit on the front edge of the chair only

Correct answer: Provide a footrest to support the feet and reduce lower leg pressure

A footrest provides stable foot support when the chair must be raised to achieve proper keyboard height, preventing the dangling legs that cause popliteal pressure and poor posture.

Question 10: The 20-20-20 rule for computer users recommends:

20 minutes seated, 20 minutes standing, 20 minute walk
20 pound weight limit every 20 minutes for 20 seconds
20 minutes work, 20 second stretch, 20 reps
Every 20 minutes look at something 20 feet away for 20 seconds (Correct answer)

Correct answer: Every 20 minutes look at something 20 feet away for 20 seconds

The 20-20-20 rule helps reduce digital eye strain by giving the ciliary muscles a rest through distant focusing every 20 minutes.

Question 11: Which metric is most useful for evaluating the effectiveness of an ergonomic intervention program over time?

Amount spent on ergonomic equipment
Number of employees trained in ergonomics
Number of ergonomic assessments completed per year
Trend in MSD incidence rates, severity rates, and associated costs before and after intervention (Correct answer)

Correct answer: Trend in MSD incidence rates, severity rates, and associated costs before and after intervention

Tracking MSD incidence and severity rates over time provides the most direct evidence of whether ergonomic interventions are reducing actual worker harm.

Question 12: Which type of office lighting arrangement best reduces veiling reflections on monitor screens?

Overhead fluorescent lights directly above the monitor
Natural light behind the monitor
Luminaires placed parallel to and between workstations (Correct answer)
Desk lamp aimed at the screen

Correct answer: Luminaires placed parallel to and between workstations

Placing overhead luminaires parallel to workstation rows and between workstations prevents direct overhead light from reflecting off monitor screens into the user's eyes.

Question 13: What is the primary purpose of a return-to-work (RTW) program in the context of ergonomics?

Providing temporary replacement workers during recovery
Documenting injuries for legal and insurance purposes
Delaying return until full medical release is obtained
Facilitating early, modified-duty return to work to speed recovery and reduce disability costs (Correct answer)

Correct answer: Facilitating early, modified-duty return to work to speed recovery and reduce disability costs

RTW programs provide modified or light duty work that keeps injured employees productive and engaged while allowing recovery, reducing disability duration and associated costs.

Question 14: The rotator cuff consists of how many muscles?

2
3
6
4 (Correct answer)

Correct answer: 4

The rotator cuff is made up of four muscles — supraspinatus, infraspinatus, teres minor, and subscapularis — that stabilize the glenohumeral joint.

Question 15: Under the Revised NIOSH Lifting Equation, a Lifting Index greater than which value means the task carries increased risk of low back pain for some workers?

1.0 (Correct answer)
0.5
2.0
3.0

Correct answer: 1.0

An LI above 1.0 indicates elevated risk for some of the workforce, and the risk keeps rising as the LI increases.

Question 16: A plant recorded 10 OSHA-recordable injuries over 400,000 employee hours worked. What is its Total Recordable Incidence Rate?

2.5
20.0
5.0 (Correct answer)
10.0

Correct answer: 5.0

Incidence rate = (10 × 200,000) / 400,000 = 5.0 per 100 full-time workers.

Question 17: What is the correct elbow angle for a seated computer worker using a keyboard at the correct height?

140 degrees (widely open)
Full extension at 180 degrees
Approximately 90-110 degrees (right angle or slightly open) (Correct answer)
60 degrees (acute angle)

Correct answer: Approximately 90-110 degrees (right angle or slightly open)

A 90-110 degree elbow angle allows the forearms to rest near horizontal with relaxed shoulder muscles, reducing upper extremity loading during keyboard use.

Question 18: Which material handling aid most effectively reduces lower back injury risk when moving pallets?

Powered pallet jack or forklift (Correct answer)
Anti-fatigue mat
Back belt
Lighter-colored packaging

Correct answer: Powered pallet jack or forklift

Powered pallet jacks and forklifts eliminate manual lifting entirely, which is the most effective control versus administrative measures like back belts.

Question 19: Keyboard trays that slope negatively (front edge higher than back) are intended to promote:

Ulnar deviation
Wrist flexion
Neutral to slight wrist extension (Correct answer)
Wrist extension

Correct answer: Neutral to slight wrist extension

A negative tilt positions the keyboard so fingers reach forward and slightly downward, promoting a neutral or mildly extended wrist aligned with the forearm.

Question 20: Which mouse design feature most effectively reduces ulnar deviation during cursor control?

A vertical or angled mouse that keeps the forearm in a handshake orientation (Correct answer)
A wireless mouse with extended range
A mouse with extra buttons on the side
A larger mouse requiring a wider grip

Correct answer: A vertical or angled mouse that keeps the forearm in a handshake orientation

Vertical and angled mice position the forearm in a neutral pronation posture, eliminating the forearm pronation and ulnar deviation associated with standard flat mice.

Question 21: What do the Liberty Mutual (Snook and Ciriello) manual material handling tables provide?

Maximum acceptable weights and forces for given percentages of the male and female population (Correct answer)
Maximum spinal compression forces measured with biomechanical models
OSHA-enforceable weight limits for workers of each gender
Recommended rest-break durations for each lifting frequency

Correct answer: Maximum acceptable weights and forces for given percentages of the male and female population

The psychophysical tables list acceptable loads for lifting, lowering, pushing, pulling, and carrying that a given percentage of workers can handle.

Question 22: Why is early symptom reporting critical to an effective ergonomic program?

It triggers automatic workers' compensation claims
Early intervention prevents minor discomfort from progressing to disabling musculoskeletal disorders (Correct answer)
It is required by OSHA recordkeeping rules for all symptoms
It allows supervisors to reassign workers before injury occurs

Correct answer: Early intervention prevents minor discomfort from progressing to disabling musculoskeletal disorders

Catching musculoskeletal symptoms early allows ergonomic and medical interventions before conditions become chronic or disabling, significantly improving outcomes and reducing costs.

Question 23: The recommended minimum aisle width for pedestrian walkways in an industrial facility where forklifts operate is approximately:

10 feet
At least 3 feet (36 inches) for pedestrians, wider for mixed traffic (Correct answer)
30 inches
18 inches

Correct answer: At least 3 feet (36 inches) for pedestrians, wider for mixed traffic

OSHA 1910.22 requires aisles to be at least 3 feet wider than the largest equipment used or at minimum 36 inches for pedestrian-only aisles.

Question 24: Which state currently has an enforceable ergonomics standard for general industry?

New York
Texas
Florida
California (Correct answer)

Correct answer: California

California's Division of Occupational Safety and Health (Cal/OSHA) enforces Title 8 regulations that include ergonomics program requirements for employers with recurring MSDs.

Question 25: Ergonomics program effectiveness is best evaluated by tracking trends in:

Square footage of standing mats purchased
Injury rates, symptom surveys, and productivity metrics over time (Correct answer)
Number of ergonomic posters displayed
Number of ergonomics-related emails sent

Correct answer: Injury rates, symptom surveys, and productivity metrics over time

Tracking injury incidence, symptom survey results, and operational productivity metrics over time provides objective evidence of whether interventions are working.

Question 26: Federal OSHA has no specific ergonomics standard. Under what provision can it cite employers for serious ergonomic hazards?

The Respiratory Protection Standard
The Hazard Communication Standard
The General Duty Clause, Section 5(a)(1) of the OSH Act (Correct answer)
The Walking-Working Surfaces Standard

Correct answer: The General Duty Clause, Section 5(a)(1) of the OSH Act

OSHA uses the General Duty Clause to cite recognized serious hazards, including ergonomic ones, that have no specific standard.

Question 27: A task analysis reveals workers bend forward more than 30° at the waist frequently. This is best classified as which type of exposure?

High contact stress
Segmental vibration
High-frequency repetition
Awkward posture — trunk flexion (Correct answer)

Correct answer: Awkward posture — trunk flexion

Forward trunk flexion beyond 30° significantly increases lumbar disc compression and shear forces and is classified as an awkward posture ergonomic risk factor.

Question 28: How should an ergonomist prioritize interventions when multiple high-risk jobs are identified simultaneously?

By combining risk severity, injury frequency, number of workers exposed, and feasibility of control implementation (Correct answer)
By alphabetical order of job titles
By starting with the cheapest interventions first regardless of risk level
By addressing supervisor-reported concerns before worker-reported concerns

Correct answer: By combining risk severity, injury frequency, number of workers exposed, and feasibility of control implementation

Prioritization should weigh the severity and frequency of current injuries, the number of workers at risk, and the practical feasibility of implementing effective controls to maximize program impact.

Question 29: How do rest breaks help prevent injury?

They reduce concentration
They limit productivity
They increase strain
They support recovery and prevent fatigue (Correct answer)

Correct answer: They support recovery and prevent fatigue

Rest breaks are a critical component of ergonomic injury prevention, especially for tasks involving repetitive motions, sustained postures, or high physical demands. These breaks allow muscles and joints to recover from exertion, reducing the accumulation of fatigue and strain that can lead to musculoskeletal injuries. By interrupting continuous work, rest breaks help to restore physical and mental capacity, thereby preventing overuse injuries and maintaining performance.

Question 30: According to the revised NIOSH Lifting Equation, what is the load constant (maximum RWL) under ideal lifting conditions?

25 pounds (11 kg)
75 pounds (34 kg)
35 pounds (16 kg)
51 pounds (23 kg) (Correct answer)

Correct answer: 51 pounds (23 kg)

Under ideal conditions where all multipliers equal 1.0, the NIOSH load constant is 51 lbs (23 kg), representing the maximum safe lift achievable in the best possible scenario.

Question 31: The Americans with Disabilities Act (ADA) requires employers with 15 or more employees to provide:

Reasonable accommodations for qualified individuals with disabilities (Correct answer)
Written ergonomics programs
Free ergonomic assessments to all staff
Ergonomic chairs for all workers

Correct answer: Reasonable accommodations for qualified individuals with disabilities

The ADA mandates reasonable accommodations — which may include ergonomic modifications — for qualified employees with disabilities, unless it causes undue hardship.

Question 32: Which grip type places the most stress on the tendons of the forearm?

Cylindrical grip
Power grip
Pinch grip (Correct answer)
Hook grip

Correct answer: Pinch grip

Pinch grip requires the finger flexors to generate high force across a small contact area, producing greater tendon load per unit of force than a power grip.

Question 33: Where should the top of a computer monitor be positioned relative to eye level?

At chin level
10 inches above eye level
At or slightly below eye level (Correct answer)
10 inches below eye level

Correct answer: At or slightly below eye level

Placing the monitor top at or slightly below eye level allows the eyes to gaze slightly downward, reducing neck extension and eye fatigue.

Question 34: What percentage of the workday does OSHA suggest as a maximum continuous seated computer work before a break is recommended?

75%
50%
25%
No more than 100% with microbreaks every hour (Correct answer)

Correct answer: No more than 100% with microbreaks every hour

OSHA recommends short, frequent micro-breaks (5 minutes per hour) rather than limiting total proportion, to address cumulative static loading.

Question 35: Which assessment tool uses six subscales, including mental demand, temporal demand, and frustration, to measure subjective workload?

Quick Exposure Check
OWAS
NASA Task Load Index (Correct answer)
Rapid Office Strain Assessment

Correct answer: NASA Task Load Index

NASA-TLX rates mental, physical, and temporal demand, performance, effort, and frustration to give an overall workload score.

Question 36: A footrest is most beneficial when:

The floor surface is carpeted
The worker prefers standing
The worker uses a sit-stand desk
The chair cannot be raised enough to support neutral posture without leaving feet dangling (Correct answer)

Correct answer: The chair cannot be raised enough to support neutral posture without leaving feet dangling

When desk height is fixed and the chair must be raised to reach the keyboard, a footrest supports the feet and restores thigh-to-torso angle.

Question 37: Which U.S. federal agency has primary authority over workplace ergonomic hazards in general industry?

ANSI (American National Standards Institute)
NIOSH (National Institute for Occupational Safety and Health)
EPA (Environmental Protection Agency)
OSHA (Occupational Safety and Health Administration) (Correct answer)

Correct answer: OSHA (Occupational Safety and Health Administration)

OSHA enforces workplace safety regulations under the OSH Act, including ergonomic hazards through the General Duty Clause when specific standards are absent.

Question 38: An ergonomist needs a whole-body postural assessment for unpredictable patient-handling tasks in a hospital. Which tool was developed specifically for this purpose?

OCRA Checklist
RULA
Strain Index
REBA (Correct answer)

Correct answer: REBA

REBA (Rapid Entire Body Assessment) was developed to assess whole-body postures in unpredictable work such as healthcare.

Question 39: Which keyboard feature is most effective at reducing ulnar deviation during typing?

Negative tilt (front raised)
Split ergonomic design (Correct answer)
Mechanical switches
Numeric keypad on the right

Correct answer: Split ergonomic design

Split keyboards angle each half outward, allowing the wrists to remain in a more neutral alignment and reducing ulnar deviation.

Question 40: What does the 'frequency multiplier' in the NIOSH Lifting Equation adjust for?

The worker's lifting frequency preference
The number of workers performing the task
The frequency of supervisor observations
The number of lifts per minute and duration of the lifting task (Correct answer)

Correct answer: The number of lifts per minute and duration of the lifting task

The frequency multiplier reduces the RWL as lifting frequency and task duration increase, accounting for the cumulative metabolic and biomechanical fatigue associated with repeated lifts.

Question 41: How should ergonomic training content differ between workers and supervisors?

Supervisors need only policy training, workers need only equipment training
Workers need more training hours than supervisors in all topics
Both groups require identical training content
Workers need task-specific hazard recognition and body mechanics; supervisors need program administration, early symptom response, and accommodation processes (Correct answer)

Correct answer: Workers need task-specific hazard recognition and body mechanics; supervisors need program administration, early symptom response, and accommodation processes

Workers need practical training on recognizing hazards and performing their specific tasks safely; supervisors need to understand program management, how to respond to symptom reports, and accommodation options.

Question 42: What is 'ulnar deviation' of the wrist?

Rotating the forearm palm-down
Bending wrist upward
Bending wrist toward the pinky side (Correct answer)
Bending wrist toward the thumb side

Correct answer: Bending wrist toward the pinky side

Ulnar deviation is lateral flexion of the wrist toward the ulna (pinky side) and is a common risk factor for carpal tunnel syndrome.

Question 43: The Rodgers Muscle Fatigue Analysis rates each body region on which three factors?

Force, posture, and vibration
Load weight, horizontal distance, and frequency
Effort level, effort duration, and effort frequency (Correct answer)
Heart rate, oxygen uptake, and recovery time

Correct answer: Effort level, effort duration, and effort frequency

Rodgers MFA scores effort intensity, how long each effort lasts, and efforts per minute to predict fatigue and set improvement priorities.

Question 44: Hand-arm vibration (HAV) exposure is most closely associated with which occupational health condition?

Thoracic outlet syndrome
Carpal tunnel syndrome
Lateral epicondylitis
Raynaud's phenomenon (vibration white finger) (Correct answer)

Correct answer: Raynaud's phenomenon (vibration white finger)

Prolonged HAV exposure causes damage to blood vessels and nerves in the fingers, leading to Raynaud's phenomenon (vibration white finger) characterized by episodic blanching.

Question 45: In a typical risk matrix used to prioritize ergonomic hazards, risk level is determined by combining which two factors?

Number of workers and shift length
Worker age and job tenure
Severity of potential harm and likelihood of occurrence (Correct answer)
Cost of the fix and time to implement

Correct answer: Severity of potential harm and likelihood of occurrence

Risk matrices rank hazards by how bad the consequence could be and how likely it is to happen.

Question 46: Job rotation is classified as which type of ergonomic control?

Elimination control
PPE
Engineering control
Administrative control (Correct answer)

Correct answer: Administrative control

Job rotation is an administrative control that limits each worker's cumulative exposure to a specific ergonomic stressor by rotating tasks, but it does not eliminate the hazard.

Question 47: What does 'moment arm' refer to in biomechanics?

The angle of a joint during movement
The perpendicular distance from a joint to the line of force (Correct answer)
The speed of a rotating limb
The strength of a muscle contraction

Correct answer: The perpendicular distance from a joint to the line of force

The moment arm is the perpendicular distance from the joint axis to the line of action of the force, determining the torque produced.

Question 48: Workers' compensation data is most useful in an ergonomics program for:

Complying with ADA requirements
Scheduling mandatory training
Identifying body parts, departments, and tasks with the highest injury frequency and cost (Correct answer)
Setting individual employee pay rates

Correct answer: Identifying body parts, departments, and tasks with the highest injury frequency and cost

Analyzing workers' compensation claims reveals injury patterns that help prioritize which departments, jobs, or body regions need ergonomic intervention first.

Question 49: What does 'participatory ergonomics' mean and why is it considered best practice?

Ergonomists participating in all workplace meetings
Involving workers and management collaboratively in identifying hazards and designing solutions, which increases acceptance and effectiveness (Correct answer)
Using participatory observation research methods only
Having workers vote on which ergonomic equipment to purchase

Correct answer: Involving workers and management collaboratively in identifying hazards and designing solutions, which increases acceptance and effectiveness

Participatory ergonomics leverages workers' firsthand knowledge of job demands and produces solutions more likely to be accepted and sustained because stakeholders had input in their design.

Question 50: When designing a job rotation schedule to reduce MSD risk, what is the most important factor?

Letting the most senior workers pick their tasks first
Making sure every task in the rotation has the same cycle time
Rotating as often as possible regardless of task content
Rotating between tasks that load different muscle groups and body regions (Correct answer)

Correct answer: Rotating between tasks that load different muscle groups and body regions

Rotation only gives recovery when each task in it stresses different tissues.

Question 51: Which type of chair adjustment is most critical for preventing lower back discomfort in prolonged seated work?

Armrest color selection
Seat pan upholstery material
Chair base caster size
Lumbar support height and depth adjustment (Correct answer)

Correct answer: Lumbar support height and depth adjustment

Proper lumbar support positioned at the lumbar curve maintains lordosis and reduces disc pressure and muscle fatigue during extended sitting.

Question 52: What is the primary ergonomic concern with a precision grip versus a power grip in industrial tasks?

Power grip is always more hazardous than precision grip
Precision grip causes direct joint injury
Precision grip requires much higher relative muscle force and causes greater tendon loading for equivalent tasks (Correct answer)
The two grips have identical biomechanical loading

Correct answer: Precision grip requires much higher relative muscle force and causes greater tendon loading for equivalent tasks

Precision grip uses a smaller contact area and fewer muscles, requiring proportionally greater effort to achieve the same force as power grip, resulting in higher muscle and tendon loading.

Question 53: The Wet Bulb Globe Temperature (WBGT) index is used by ergonomists primarily to assess which environmental stressor?

Heat stress (Correct answer)
Whole-body vibration
Noise exposure
Indoor air quality

Correct answer: Heat stress

WBGT integrates air temperature, humidity, radiant heat, and air movement to provide a composite index for evaluating heat stress risk.

Question 54: When calculating the cost-benefit ratio of an ergonomic intervention, which costs should be included?

Only OSHA fine avoidance savings
Equipment costs, installation, training, AND indirect costs including lost productivity, overtime, and replacement worker costs (Correct answer)
Only the direct cost of ergonomic equipment purchased
Workers' compensation premiums only

Correct answer: Equipment costs, installation, training, AND indirect costs including lost productivity, overtime, and replacement worker costs

A comprehensive cost-benefit analysis includes all direct costs (equipment, installation) and indirect costs (lost productivity, replacement workers, absenteeism) to accurately demonstrate ROI.

Question 55: What is the ergonomic purpose of a torque reaction bar or torque arm for power screwdriver tools?

It increases the torque output of the tool
It absorbs torque reaction force so workers do not have to resist tool rotation with their hands and arms (Correct answer)
It reduces the weight of the tool held by the worker
It serves as a storage hook for the tool

Correct answer: It absorbs torque reaction force so workers do not have to resist tool rotation with their hands and arms

Torque reaction bars counteract the rotational force generated when a power tool drives a fastener, preventing that force from being transmitted through the worker's hand, wrist, and arm.

Question 56: In the revised NIOSH Lifting Equation, what is the horizontal multiplier (HM) when the hands are 50 cm from the midpoint between the ankles?

0.63
1.00
0.25
0.50 (Correct answer)

Correct answer: 0.50

HM = 25/H, so 25/50 = 0.50.

Question 57: Which metric is used to describe the strength of a light source's ability to reveal colors accurately compared to a reference light?

Lux level
Color temperature (CCT)
Luminous efficacy
Color rendering index (CRI) (Correct answer)

Correct answer: Color rendering index (CRI)

The Color Rendering Index (CRI) rates a lamp's ability to reproduce colors faithfully, with 100 indicating perfect rendering compared to a reference source.

Question 58: Which monitor characteristic most directly affects the ergonomic risk of eye strain and visual fatigue?

Refresh rate and resolution (Correct answer)
Stand adjustability
USB port availability
Screen diagonal size

Correct answer: Refresh rate and resolution

Higher refresh rates (≥60 Hz) and sufficient resolution minimize flicker and pixelation, both key drivers of visual fatigue during extended computer use.

Question 59: Which joint is most commonly stressed during prolonged overhead work tasks?

Hip (coxofemoral)
Wrist (radiocarpal)
Elbow (humeroulnar)
Shoulder (glenohumeral) (Correct answer)

Correct answer: Shoulder (glenohumeral)

Overhead work requires sustained shoulder elevation, placing high mechanical load on the glenohumeral joint and surrounding rotator cuff muscles.

Question 60: How do rest breaks help prevent injury?

They reduce concentration
They limit productivity
They support recovery and prevent fatigue (Correct answer)
They increase strain

Correct answer: They support recovery and prevent fatigue

Question 61: Which factor increases ergonomic injury risk?

Prolonged awkward posture (Correct answer)
Scheduled job rotation
Adjustable workstations
Dynamic movement

Correct answer: Prolonged awkward posture

Prolonged awkward postures significantly increase ergonomic injury risk because they place undue stress on muscles, tendons, ligaments, and joints. Maintaining positions that deviate from the body's natural alignment for extended periods can compress nerves, restrict blood flow, and cause cumulative trauma. This sustained strain can lead to fatigue, discomfort, and eventually musculoskeletal disorders such as back pain, neck strain, or carpal tunnel syndrome.

Question 62: Which keyboard position is recommended to minimize wrist extension during typing?

Vertical orientation
Steep positive tilt (back edge higher than front)
Flat or slightly negative tilt (front edge higher than back) (Correct answer)
No tilt preference exists

Correct answer: Flat or slightly negative tilt (front edge higher than back)

A flat or slightly negative keyboard tilt encourages wrist neutral or slight flexion, avoiding the wrist extension that occurs with a positively tilted keyboard and increases carpal tunnel pressure.

Question 63: What is the recommended illuminance level (in foot-candles) for general office tasks such as reading and writing according to the Illuminating Engineering Society (IES)?

150–200 fc
70–100 fc
10–20 fc
30–50 fc (Correct answer)

Correct answer: 30–50 fc

IES recommends 30–50 foot-candles (300–500 lux) for general office work such as reading printed materials.

Question 64: According to ASHRAE Standard 55, the recommended operative temperature range for sedentary office work in summer conditions is approximately:

70–76°F (21–24°C) (Correct answer)
64–68°F (18–20°C)
86–90°F (30–32°C)
78–84°F (26–29°C)

Correct answer: 70–76°F (21–24°C)

ASHRAE 55 specifies approximately 70–76°F (21–24°C) for sedentary work in summer, accounting for lighter clothing insulation.

Question 65: What is the recommended monitor height for a seated computer user to minimize neck strain?

Screen center at eye level
Top of the screen at or slightly below eye level (Correct answer)
Monitor placed at desk surface level
Monitor positioned above eye level

Correct answer: Top of the screen at or slightly below eye level

Positioning the top of the monitor at or slightly below eye level allows the user to gaze slightly downward, maintaining natural cervical spine curvature and reducing neck extension.

Question 66: What does 'force-velocity relationship' mean in muscle biomechanics relevant to ergonomics?

Muscles produce less force as contraction speed increases (Correct answer)
Force and velocity are independent variables
Faster movements always produce more force
Static contractions produce the least force

Correct answer: Muscles produce less force as contraction speed increases

The force-velocity relationship shows that concentric muscle force decreases as contraction velocity increases, which is relevant when designing high-speed repetitive tasks.

Question 67: Which OSHA standard most directly addresses ergonomic hazards in general industry?

OSHA General Duty Clause Section 5(a)(1) (Correct answer)
29 CFR 1910.900 (Ergonomics Standard)
29 CFR 1910.132 (PPE)
29 CFR 1910.147 (Lockout/Tagout)

Correct answer: OSHA General Duty Clause Section 5(a)(1)

The US currently has no specific federal ergonomics standard for general industry; OSHA uses the General Duty Clause to cite ergonomic hazards where a recognized hazard exists.

Question 68: Why is ergonomic education important in the workplace?

To delay work tasks
To promote uniform behavior
To prevent injuries through awareness (Correct answer)
To increase costs

Correct answer: To prevent injuries through awareness

Ergonomic education in the workplace is vital because it equips employees with the knowledge to understand how their work environment and tasks can impact their bodies. By raising awareness of ergonomic principles and potential risk factors, employees can identify hazards, adopt safer work practices, and make informed adjustments to their workstations. This proactive understanding significantly contributes to preventing musculoskeletal injuries and promoting overall well-being.

Question 69: When a cart must be moved by hand, which method is generally preferred to reduce injury risk?

Pulling the cart while walking backward
Pushing the cart with hands at shoulder height or above
Pushing the cart with hands at about waist to elbow height (Correct answer)
Pulling the cart with one hand behind the body

Correct answer: Pushing the cart with hands at about waist to elbow height

Pushing at waist-to-elbow height lets workers use body weight, keeps them facing their direction of travel, and lowers shoulder and back strain.

Question 70: Which approach is recommended for sustaining long-term ergonomics program improvements after initial hazards are controlled?

Conducting a one-time comprehensive assessment and closing the program
Relying solely on annual re-training programs
Integrating ergonomics into ongoing processes such as new equipment procurement, facility changes, and injury trend monitoring (Correct answer)
Delegating all follow-up to workers without management involvement

Correct answer: Integrating ergonomics into ongoing processes such as new equipment procurement, facility changes, and injury trend monitoring

Sustainable ergonomics programs integrate hazard prevention into standard business processes so that new equipment, facility changes, and emerging hazards are addressed systematically before they cause injury.

Question 71: What does a 'medical management' component add to a comprehensive ergonomics program?

Annual fitness testing for all workers
Mandatory pre-employment physical exams only
Early medical evaluation, treatment, and rehabilitation of MSD cases to prevent progression and facilitate recovery (Correct answer)
Onsite dispensing of over-the-counter pain medications

Correct answer: Early medical evaluation, treatment, and rehabilitation of MSD cases to prevent progression and facilitate recovery

Medical management provides structured early evaluation and treatment of MSD symptoms, preventing cases from progressing to disability and facilitating return to productive work.

Question 72: Which data source is most useful for prioritizing which jobs to assess first in an ergonomics program?

Job title listings from HR records
Equipment purchase receipts
OSHA 300 log MSD injury records, workers' compensation claims data, and employee symptom surveys (Correct answer)
Supervisor opinions without data review

Correct answer: OSHA 300 log MSD injury records, workers' compensation claims data, and employee symptom surveys

MSD injury records and workers' compensation data identify which jobs are producing actual harm, while symptom surveys capture early-stage problems not yet in injury records.

Question 73: Why is management commitment considered the most critical element of an effective ergonomics program?

Because managers are the most knowledgeable about ergonomic hazards
Because workers are unable to participate without management permission
Without management support, resources are unavailable, accountability is absent, and worker participation is not valued (Correct answer)
Because OSHA legally mandates management to be the primary program driver

Correct answer: Without management support, resources are unavailable, accountability is absent, and worker participation is not valued

Management commitment provides the resources, policy backing, and cultural priority needed for ergonomics programs to function; without it, even technically sound programs fail from lack of support.

Question 74: Which standard provides ergonomic guidelines specifically for office workstations with display screen equipment in the US?

ASTM E1332
ANSI/HFES 100 (Correct answer)
ISO 9241
OSHA 1910.147

Correct answer: ANSI/HFES 100

ANSI/HFES 100 (Human Factors Engineering of Computer Workstations) provides US-specific dimensional and design recommendations for display screen workstations.

Question 75: Spring-loaded scissors (with return spring) are recommended ergonomically because they:

Increase cutting force
Are lighter than standard scissors
Reduce blade sharpness needs
Eliminate the opening stroke muscle effort, reducing fatigue (Correct answer)

Correct answer: Eliminate the opening stroke muscle effort, reducing fatigue

The return spring passively opens the scissor blades, removing the need for the extensor muscles to actively open the fingers after each cut, halving cumulative exertion.

Question 76: Which lighting condition in an office is most likely to cause glare on computer monitors?

Task lighting positioned below the monitor level
Use of monitor privacy screens
Windows or overhead lights positioned in front of or behind the monitor creating direct or reflected glare (Correct answer)
Dimly lit offices with no natural light

Correct answer: Windows or overhead lights positioned in front of or behind the monitor creating direct or reflected glare

Light sources in the same field of view as the monitor or behind the monitor reflecting into the worker's eyes create both direct and veiling glare, reducing visual comfort.

Question 77: Which handle design feature most reduces grip force requirements for industrial hand tools?

Square cross-section handles
Handle diameter matched to the worker's hand size (approximately 1.25-1.75 inches for most adults) (Correct answer)
Maximum handle length possible
Smooth, polished handle surfaces

Correct answer: Handle diameter matched to the worker's hand size (approximately 1.25-1.75 inches for most adults)

Handle diameter matched to the hand allows maximum grip force generation with minimum muscular effort; too small or too large a diameter reduces mechanical advantage and increases exertion.

Question 78: In the NIOSH Revised Lifting Equation (1994), what is the Recommended Weight Limit (RWL) used to calculate?

Average weight lifted across a shift
The legal weight limit per OSHA standards
A weight limit specific to the task conditions that protects most healthy workers (Correct answer)
Maximum force a worker should ever exert

Correct answer: A weight limit specific to the task conditions that protects most healthy workers

The RWL is the task-specific maximum load weight that protects approximately 75% of male and 99% of female workers from excessive spinal compression.

Question 79: What is the primary purpose of a 'team lift' protocol?

To reduce the number of lifts per day
To distribute the load so no single worker exceeds individual capacity (Correct answer)
To increase speed of material handling
To comply with union agreements

Correct answer: To distribute the load so no single worker exceeds individual capacity

Team lifts distribute heavy or bulky loads among two or more workers so that each person's share remains within safe individual lifting limits.

Question 80: What is the CES (Certified Ergonomic Specialist) certification designed to demonstrate?

Qualification to prescribe medical treatment for MSDs
Competency in applying ergonomic principles to identify workplace hazards and implement solutions in professional practice (Correct answer)
Specialization exclusively in computer workstation assessment
A license to legally perform ergonomic assessments under federal law

Correct answer: Competency in applying ergonomic principles to identify workplace hazards and implement solutions in professional practice

The CES credential demonstrates that the holder has the knowledge and skills to apply ergonomic science to real-world workplace problems through hazard identification, assessment, and solution implementation.

Question 81: Which ergonomic assessment tool was developed partly in response to European Directive 90/270/EEC on display screen equipment?

Liberty Mutual Tables
RULA (Rapid Upper Limb Assessment) (Correct answer)
NIOSH Lifting Equation
REBA

Correct answer: RULA (Rapid Upper Limb Assessment)

RULA was developed by McAtamney and Corlett in 1993 partly in response to European Directive 90/270/EEC requiring systematic assessment of display screen equipment workstations.

Question 82: What should be included in an ergonomic training program?

Company history
Product marketing
Finance and accounting basics
Ergonomic risks and safe practices (Correct answer)

Correct answer: Ergonomic risks and safe practices

An effective ergonomic training program must focus on practical and relevant information that directly impacts employee safety and health. This includes educating workers about common ergonomic risks specific to their job roles, such as repetitive motions, awkward postures, and forceful exertions. Crucially, it must also teach them specific safe practices, proper body mechanics, and how to utilize ergonomic equipment to mitigate these risks.

Question 83: The OWAS method, developed in the Finnish steel industry, codes postures for which combination of elements?

Back, arms, legs, and load or force used (Correct answer)
Head, eyes, trunk, and lighting
Shoulders, elbows, hands, and vibration
Neck, trunk, wrists, and grip type

Correct answer: Back, arms, legs, and load or force used

OWAS assigns codes for back, arm, and leg postures plus the load handled to classify postures into action categories.

Question 84: What is the recommended minimum seat pan depth adjustment range for office chairs?

10 inches
1 inch
2–4 inches (Correct answer)
6–8 inches

Correct answer: 2–4 inches

A seat pan depth range of 2–4 inches accommodates variation in thigh length while maintaining 2–3 finger-widths of clearance behind the knee.

Question 85: A force plate is most useful in an ergonomic evaluation for assessing:

Grip strength during tool use
Ground reaction forces and weight distribution during standing or lifting (Correct answer)
Lighting adequacy at a workstation
Vibration exposure levels

Correct answer: Ground reaction forces and weight distribution during standing or lifting

Force plates measure the vertical, horizontal, and shear forces exerted through the feet, providing data on balance, weight shift, and postural loading.

Question 86: The CES (Certified Ergonomic Specialist) credential is awarded by which organization?

Board of Certification in Professional Ergonomics (BCPE)
OSHA
Back School of Atlanta (Correct answer)
American Society of Safety Professionals (ASSP)

Correct answer: Back School of Atlanta

The CES credential is offered by the Back School of Atlanta and focuses on practical ergonomic assessment and hazard control skills.

Question 87: Armrests that are set too high primarily cause which ergonomic problem?

Wrist extension
Hip flexion
Knee contact stress
Shoulder elevation and trapezius muscle tension (Correct answer)

Correct answer: Shoulder elevation and trapezius muscle tension

Armrests that are too high force the shoulders upward in a shrugged position, creating chronic static load in the trapezius and levator scapulae.

Question 88: What is the recommended viewing distance from the eyes to the monitor for most computer tasks?

36-48 inches
Greater than 4 feet
6-12 inches
18-30 inches (approximately arm's length) (Correct answer)

Correct answer: 18-30 inches (approximately arm's length)

A viewing distance of 18-30 inches reduces accommodative strain on the eyes and allows workers to read screen content without leaning forward or squinting.

Question 89: NIOSH's role in ergonomics is primarily:

Enforcing OSHA standards
Conducting research and issuing recommended exposure limits (Correct answer)
Certifying ergonomists
Setting legal weight limits for lifting

Correct answer: Conducting research and issuing recommended exposure limits

NIOSH (National Institute for Occupational Safety and Health) conducts research, develops criteria documents, and issues recommended exposure limits, but has no enforcement authority.

Question 90: What does the anthropometric concept of 'design for the 5th to 95th percentile' mean in ergonomics?

Designing workstations to accommodate 90% of the target population (Correct answer)
Designing for the smallest worker only
Using only average measurements for design
Targeting the largest workers exclusively

Correct answer: Designing workstations to accommodate 90% of the target population

Designing for the 5th to 95th percentile means the workspace accommodates 90% of users, balancing practical design constraints with broad usability.

Question 91: Which NIOSH document provides the revised lifting equation used to calculate the Recommended Weight Limit (RWL)?

ANSI Z365 Standard
OSHA 3123 Ergonomic Guidelines
ACGIH TLV Handbook
Applications Manual for the Revised NIOSH Lifting Equation (1994) (Correct answer)

Correct answer: Applications Manual for the Revised NIOSH Lifting Equation (1994)

The 1994 NIOSH Applications Manual presents the revised lifting equation and multipliers used to calculate the RWL and Lifting Index for manual handling assessment.

Question 92: What is the recommended lumbar support height in an ergonomic office chair?

Between the iliac crest and the bottom of the rib cage (6–10 inches above seat) (Correct answer)
At the shoulder blades
At the mid-thoracic level
Just above the seat pan

Correct answer: Between the iliac crest and the bottom of the rib cage (6–10 inches above seat)

Lumbar support positioned 6–10 inches above the seat pan targets the natural inward curve of the lumbar spine, maintaining lordosis during seated work.

Question 93: Which metric is most commonly used as a 'leading indicator' in an ergonomics program?

Number of lost workdays
Total workers' compensation cost
Number of OSHA recordable injuries last year
Number of ergonomic assessments completed and hazards corrected (Correct answer)

Correct answer: Number of ergonomic assessments completed and hazards corrected

Leading indicators measure proactive activity — like assessments completed and controls implemented — before injuries happen, unlike lagging indicators that count past injuries.

Question 94: Which muscle group is primarily responsible for maintaining upright posture of the spine?

Rectus abdominis
Erector spinae (Correct answer)
Iliopsoas
Quadratus lumborum

Correct answer: Erector spinae

The erector spinae muscle group runs along the spine and provides the primary extensor force needed to maintain upright posture.

Question 95: What seat pan depth is recommended to avoid pressure on the back of the knees in a properly adjusted office chair?

2-3 inches clearance between the front edge of the seat and the back of the knees (Correct answer)
Maximum seat depth regardless of leg length
Seat pan shorter than thigh length by 6 inches
Seat pan extending to touch the back of the knees

Correct answer: 2-3 inches clearance between the front edge of the seat and the back of the knees

A 2-3 inch gap between the seat front edge and the popliteal area prevents pressure on the popliteal nerves and blood vessels while still providing adequate thigh support.

Question 96: What is the Lifting Index (LI) threshold in the NIOSH Lifting Equation that indicates a significant risk of low back injury?

LI greater than 3.0
LI equal to exactly 2.0
LI greater than 1.0 (Correct answer)
LI less than 0.5

Correct answer: LI greater than 1.0

An LI greater than 1.0 indicates the lifting task exceeds the recommended weight limit and poses increased risk of low back disorders, requiring ergonomic intervention.

Question 97: An assessor measuring workstation lighting for a precision inspection task should record which quantity with a light meter?

Luminance in candela per square meter
Luminous intensity in candela
Illuminance in lux (or foot-candles) (Correct answer)
Color temperature in kelvin

Correct answer: Illuminance in lux (or foot-candles)

A standard light meter measures illuminance, the light falling on a surface, in lux or foot-candles.

Question 98: Which spinal region is most commonly affected by work-related musculoskeletal disorders in office workers?

Lumbar (Correct answer)
Thoracic
Sacral
Cervical

Correct answer: Lumbar

The lumbar spine bears the most compressive load during prolonged sitting, making it the most common site of work-related back pain.

Question 99: What is the recommended ambient noise level in an office for concentration-intensive computer work?

Above 65 dBA to mask distracting sounds
No specific limit applies to office environments
Below 55 dBA to avoid interference with cognitive performance and communication (Correct answer)
Below 85 dBA (the OSHA hearing conservation action level)

Correct answer: Below 55 dBA to avoid interference with cognitive performance and communication

Office environments for concentrated work should aim for below 55 dBA; higher ambient noise impairs speech intelligibility, increases stress, and reduces cognitive performance.

Question 100: What is the maximum recommended horizontal reach distance for power grip tasks at workstation height?

30 inches
10 inches
16 inches (normal zone) (Correct answer)
6 inches

Correct answer: 16 inches (normal zone)

The normal work zone for power grip tasks extends to approximately 16 inches from the body, where shoulder and elbow forces remain manageable.

Question 101: What is the primary purpose of an electromyography (EMG) assessment in ergonomic studies?

Measure muscle activation and fatigue during tasks (Correct answer)
Evaluate joint range of motion
Record heart rate variability
Assess visual acuity

Correct answer: Measure muscle activation and fatigue during tasks

EMG measures electrical activity in muscles, allowing ergonomists to quantify muscle effort, identify overexertion, and document fatigue patterns during work tasks.

Question 102: Which federal agency is primarily responsible for enforcing workplace safety and health regulations in the US?

EPA
NIOSH
CDC
OSHA (Correct answer)

Correct answer: OSHA

OSHA (Occupational Safety and Health Administration) under the Department of Labor is the primary federal enforcement agency for workplace safety standards.

Question 103: What is 'computer vision syndrome' and which ergonomic factors contribute to it?

An OSHA-recognized occupational illness requiring mandatory medical leave
A condition requiring prescription eyewear for all computer users
A permanent visual impairment caused by blue light exposure
Eye discomfort and visual fatigue from prolonged screen use, worsened by glare, poor lighting, and incorrect screen distance (Correct answer)

Correct answer: Eye discomfort and visual fatigue from prolonged screen use, worsened by glare, poor lighting, and incorrect screen distance

Computer vision syndrome encompasses eye strain, dry eyes, headaches, and blurred vision from prolonged screen use, exacerbated by glare, improper viewing distance, and poor lighting.

Question 104: What are OSHA Voluntary Protection Programs (VPP) and how do they relate to ergonomics?

Voluntary worker participation in ergonomic training only
Industry self-regulation programs replacing OSHA inspections
Optional ergonomic assessment programs offered by insurance companies
OSHA cooperative programs recognizing employers with exemplary safety programs including proactive ergonomics management (Correct answer)

Correct answer: OSHA cooperative programs recognizing employers with exemplary safety programs including proactive ergonomics management

OSHA's VPP recognizes employers who demonstrate exemplary occupational safety and health management, including comprehensive ergonomics programs, through a rigorous application and site review process.

Question 105: A lifting task requires 90 degrees of trunk twisting. What is the asymmetric multiplier (AM = 1 − 0.0032A)?

0.81
0.90
0.71 (Correct answer)
0.68

Correct answer: 0.71

AM = 1 − (0.0032 × 90) = 1 − 0.288 = 0.712, about 0.71.

Question 106: What are the four core elements of an effective ergonomics program as outlined by OSHA guidelines?

Workstation purchases, hiring ergonomists, medical surveillance, and insurance management
Management commitment, employee involvement, hazard identification and control, and training (Correct answer)
Annual ergonomic assessments, PPE provision, supervisor training, and cost tracking
OSHA compliance audits, equipment purchasing, injury treatment, and legal review

Correct answer: Management commitment, employee involvement, hazard identification and control, and training

OSHA ergonomic guidelines identify management commitment, employee involvement, systematic hazard identification and control, and training as the foundation of an effective ergonomics program.

Question 107: Which posture assessment tool assigns a score based on upper arm, lower arm, wrist, neck, trunk, and leg positions?

Strain Index
REBA (Rapid Entire Body Assessment) (Correct answer)
NIOSH Lifting Equation
OCRA checklist

Correct answer: REBA (Rapid Entire Body Assessment)

REBA evaluates whole-body posture by scoring upper limb, neck, trunk, and leg positions, then combines scores with load, coupling, and activity factors.

Question 108: Which type of glare occurs when a bright light source is directly within the visual field, causing discomfort or loss of visibility?

Veiling glare
Reflected glare
Disability glare
Discomfort glare (Correct answer)

Correct answer: Discomfort glare

Discomfort glare causes visual discomfort from a bright source within the field of view, while disability glare actually reduces visual performance.

Question 109: Why is a document holder recommended for workers who reference paper documents while typing?

It keeps the desk surface clear for other tasks
It is required by OSHA for all computer workstations
It prevents documents from being contaminated
It positions documents near the monitor to reduce repetitive head turning and neck strain (Correct answer)

Correct answer: It positions documents near the monitor to reduce repetitive head turning and neck strain

Placing a document holder adjacent to the monitor at the same height and distance reduces the repetitive head rotation and neck flexion that occurs when looking between the desk and screen.

Question 110: Dual-monitor setups are best configured ergonomically when the user primarily uses one monitor by:

Centering the primary monitor in front and angling the secondary monitor to the side (Correct answer)
Placing both monitors to the non-dominant side
Stacking one monitor above the other
Placing both monitors side by side equally centered on the user

Correct answer: Centering the primary monitor in front and angling the secondary monitor to the side

Centering the primary monitor directly in front reduces chronic neck rotation, with the secondary angled to minimize deviation when occasional reference is needed.

Question 111: What is the main purpose of building frequent microbreaks into highly repetitive work?

Meeting a federal OSHA requirement for hourly breaks
Allowing short recovery periods that reduce localized muscle fatigue (Correct answer)
Raising production quotas
Replacing the need for engineering controls

Correct answer: Allowing short recovery periods that reduce localized muscle fatigue

Brief, frequent pauses let muscles and tendons recover and limit the fatigue that builds up and contributes to MSDs.

Question 112: Which of the following helps manage ergonomic risk?

Ignoring repetitive tasks
Reducing employee input
Avoiding safety assessments
Monitoring and adjusting work processes (Correct answer)

Correct answer: Monitoring and adjusting work processes

Managing ergonomic risk is an ongoing, dynamic process that requires continuous attention. Monitoring work processes allows for the identification of emerging or persistent ergonomic hazards, as well as the evaluation of the effectiveness of existing controls. Regularly adjusting work processes, equipment, or training based on this monitoring ensures that the workplace remains optimized for worker comfort and safety, thereby proactively mitigating risks.

Question 113: Which method, referenced in ISO 11228-3, compares actual technical actions per minute with recommended actions to assess repetitive upper limb risk?

REBA
OCRA index (Correct answer)
Snook tables
NIOSH Lifting Equation

Correct answer: OCRA index

The OCRA index is the ratio of actual technical actions to recommended technical actions and is the preferred method in ISO 11228-3.

Question 114: Under OSHA recordkeeping rules, which treatment for a work-related wrist strain makes the case recordable?

Giving a nonprescription drug at nonprescription strength
Using a non-rigid wrist wrap
Prescribing a prescription-strength anti-inflammatory medication (Correct answer)
Applying hot or cold packs

Correct answer: Prescribing a prescription-strength anti-inflammatory medication

Prescription medication counts as medical treatment beyond first aid, so the case must be recorded.

Question 115: According to OSHA's permissible exposure limit (PEL), what is the maximum noise exposure allowed for an 8-hour workday without hearing protection?

95 dBA
85 dBA
90 dBA (Correct answer)
100 dBA

Correct answer: 90 dBA

OSHA's PEL for noise is 90 dBA as an 8-hour time-weighted average (TWA); exposure above this requires engineering controls or hearing protection.

Certified Ergonomic Specialist (CES)

The CES exam tests competency in ergonomics principles including human factors, biomechanics, environmental ergonomics, and workplace program management. It is designed for professionals who assess and improve work environments to reduce injury risk and enhance human performance.

115

Questions

180 min

Time Limit

70%

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