CES Human Factors & Biomechanics

Question 1

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

Accepted Answer

Shoulder (glenohumeral)

Answer

Elbow (humeroulnar)

Answer

Wrist (radiocarpal)

Answer

Hip (coxofemoral)

Question 2

What does the term 'neutral posture' refer to in ergonomics?

Accepted Answer

A position that minimizes mechanical stress on muscles and joints

Answer

Standing perfectly upright at all times

Answer

Avoiding all movement during work tasks

Answer

Using maximum joint range of motion

Question 3

Which biomechanical principle explains why a longer lever arm increases the force needed by muscles?

Accepted Answer

Torque principle

Answer

Newton's third law

Answer

Pascal's law

Answer

Hooke's law

Question 4

What is the recommended maximum acceptable reach distance for frequent work tasks at seated workstations?

Accepted Answer

Within the primary work zone (elbow radius)

Answer

Full arm extension

Answer

Beyond shoulder width

Answer

At or above shoulder height

Question 5

Which cumulative trauma disorder is associated with repetitive pinch grip and lateral wrist deviation?

Accepted Answer

De Quervain's tenosynovitis

Answer

Carpal tunnel syndrome

Answer

Lateral epicondylitis

Answer

Trigger finger

Question 6

In spine biomechanics, which lumbar motion creates the highest intradiscal pressure?

Accepted Answer

Flexion combined with rotation

Answer

Pure extension

Answer

Lateral bending only

Answer

Neutral standing posture