CSO Ergonomics and Manual Handling 1 — Questions and Answers
Question 1: What is the generally accepted maximum recommended weight for a single person to lift manually without mechanical assistance in most US workplaces?
- 25 lbs (11 kg)
- 50 lbs (23 kg) (Correct answer)
- 75 lbs (34 kg)
- 100 lbs (45 kg)
Correct answer: 50 lbs (23 kg)
NIOSH and most US safety guidelines cite approximately 50 lbs (23 kg) as the upper recommended limit for a single-person manual lift under ideal conditions.
Question 2: Which of the following best describes the correct technique for manually lifting a heavy object from the floor?
- Bend at the waist with legs straight to use back muscles
- Bend at the knees, keep the back straight, and lift using leg muscles (Correct answer)
- Twist your torso as you lift to distribute weight evenly
- Lift as quickly as possible to minimize time under load
Correct answer: Bend at the knees, keep the back straight, and lift using leg muscles
Bending the knees, maintaining a straight back, and using the powerful leg muscles protects the spine from injury during lifting.
Question 3: Ergonomics is best defined as:
- The study of workplace accidents and fatality statistics
- The science of designing work environments and tools to fit the human body and reduce injury (Correct answer)
- A category of personal protective equipment for heavy lifting
- A set of rules governing the maximum weight employees may carry
Correct answer: The science of designing work environments and tools to fit the human body and reduce injury
Ergonomics is the scientific discipline focused on fitting tasks, tools, and environments to workers to reduce physical strain and injury risk.
Question 4: When manually lifting a load, how should the object be positioned relative to your body?
- At arm's length to protect your feet from dropped objects
- As close to the body as possible, near the center of gravity (Correct answer)
- At shoulder height before beginning the lift
- Shifted to one side to free one hand for balance
Correct answer: As close to the body as possible, near the center of gravity
Keeping the load close to the body significantly reduces the moment arm and the stress placed on the lower back muscles and spine.
Question 5: Which of the following is a common early warning sign of a musculoskeletal disorder (MSD)?
- Increased energy and improved alertness during repetitive tasks
- Persistent pain, stiffness, tenderness, or discomfort in muscles or joints (Correct answer)
- Faster and more efficient completion of manual tasks
- Improved grip strength after repeated handling
Correct answer: Persistent pain, stiffness, tenderness, or discomfort in muscles or joints
Early MSDs often present as persistent pain, stiffness, or discomfort that should be reported promptly before the condition worsens.
Question 6: What is the primary goal of applying ergonomic principles in the workplace?
- To maximize production speed by reducing rest breaks
- To reduce worker fatigue and injury risk by adapting work conditions to fit the worker (Correct answer)
- To eliminate the need for personal protective equipment entirely
- To standardize all job tasks so every worker performs them identically
Correct answer: To reduce worker fatigue and injury risk by adapting work conditions to fit the worker
Ergonomics aims to fit the job to the worker — reducing physical stress, fatigue, and the risk of musculoskeletal injuries.
Question 7: Which body movement during manual lifting places the greatest stress on the lumbar (lower) spine?
- Bending the knees before lifting
- Twisting or rotating the torso while bearing a load (Correct answer)
- Keeping the load close to the body during the lift
- Using a wide, stable stance as a base of support
Correct answer: Twisting or rotating the torso while bearing a load
Twisting the torso under load dramatically increases compressive and shear forces on the lumbar spine discs and is a leading cause of back injuries.
CSO Ergonomics and Manual Handling 1
What is the generally accepted maximum recommended weight for a single person to lift manually without mechanical assistance in most US workplaces?