Ergonomics: definition, need and benefits

Preventive ergonomics reduces risk before it becomes a problem. In exams, consider early improvement correct.

The direct answer is option A: the number of affected people, seriousness of risk and feasibility of improvement are most useful. Ergonomic priority means deciding which problem should be addressed first. Start by measuring how many workers are affected. Then judge the possible harm, such as pain, injury risk or loss of ability to work. Finally consider whether a practical improvement can be made with available time, equipment and money. Option A is correct because it combines impact, urgency and realistic action. Option B is wrong because wall colour and curtain price do not measure ergonomic risk. Option C is wrong because an employee’s nickname is unrelated to safety evidence. Option D is wrong because decoration style does not show who is at risk or how serious the problem is. A good decision uses relevant data rather than personal preference. Memory cue: priority depends on people affected, risk severity and workable solution.

Repeated backward turning can cause unnecessary movement and neck-back strain. In exams, observe movement patterns.

For wrong method, training and method correction are directly useful. In exams, choose measure according to problem type.

Correct ergonomics improves safety and efficiency together. In exams, value sustainable productivity.

Ergonomics means arranging the workplace, tools, tasks, and surroundings so that people can work safely, comfortably, and efficiently. Poor conditions can force the mind to deal with constant distractions and extra effort. Continuous noise, clutter, and unclear signs make it harder to focus, find things, understand directions, and avoid mistakes. This continuing mental effort can increase mental fatigue.

Option A is correct because all three conditions create unnecessary attention demands. Clear labels and a quiet setting usually support concentration; proper lighting and comfortable posture reduce strain; and clear paths with suitable tools improve safe work. These alternatives describe supportive ergonomics, whereas option A describes an environment likely to overload attention.

New tools help only when the whole work system is suitable. In exams, do not treat tools as the only solution.

Floor can affect both safety and physical comfort. In exams, include floor in work environment.

Temperature can affect both body and attention. In exams, treat temperature as an environmental factor.

Ergonomic improvement should provide both comfort and clarity. In exams, review outcomes in a balanced way.

The direct answer is A, Prevention of chronic back and wrist problems through correct posture and work cycle. Ergonomics means designing work, tools and posture so that the human body can work safely and comfortably. Step by step: sit or stand in a suitable posture; keep the back, neck and wrists in a safer position; arrange the work area properly; use suitable work-rest cycles; repeated strain is then reduced; over a long period, the risk of chronic pain and injury can decrease. Option A is correct because it states a lasting health benefit of ergonomic practice. Option B, one-day decoration, may make a place look attractive but is not a long-term health benefit and is not the purpose of ergonomics. Option C, removing breaks to give higher targets, increases fatigue and repetitive strain, so it can harm health. Option D, working fast in a wrong posture, increases stress on muscles and joints and is unsafe. Ergonomics does not promise that every illness will disappear, but it helps reduce preventable work-related problems. Memory cue: ergonomics means fitting work to people, not forcing people to suffer for work.

Errors are examined with both personal and environmental causes. In exams, understand the link between lighting and error.

Direct answer: Option A is correct. An assistive device is suitable when a task demands more force, reach, lifting, holding or repetition than a person can safely provide. A trolley, lift, handle, reach aid or other properly selected device can reduce physical load and support the worker’s capacity. The device must still be assessed for fit, training and new hazards. Option B is wrong because no added device is needed merely when work is already light and safe. Option C is wrong because absence of difficulty gives no ergonomic reason for an aid. Option D is wrong because a device that increases risk should not be provided in that form; it must be redesigned or rejected. The decision is based on reducing an actual mismatch between human ability and task demand. Memory cue: assistive equipment should reduce strain, not add danger.

Without usability even a good design is not effective. In exams, consider practical use necessary.

Direct answer: Option A is correct. Useful ergonomic data must describe the task, the worker’s experience and the result of the work. Recording where pain occurs, during which work step it appears, when breaks occur and where errors repeat can reveal a pattern. That pattern helps identify the risky step and choose a targeted improvement. Option B is wrong because decoration opinions do not measure physical workload or task risk. Option C is wrong because chair colour has no meaningful relation to posture, force or errors. Option D is wrong because a nickname identifies a person but does not explain the ergonomic problem; confidential identification may be needed, but it is not the relevant risk data here. Good data are relevant, specific and connected to decisions. Memory cue: record what hurts, when, during which step and with what result.

Ergonomics emphasises sustainable and safe work. In exams, separate short-term result from long-term risk.

The direct answer is option A: change the item height when the main work surface is suitable but a frequently used item is kept too low. Ergonomic improvement should be specific, not unnecessarily large. First identify the exact source of awkward posture or repeated bending. If the table itself has a suitable height and only one often-used object is low, raising or repositioning that object may solve the problem with less effort and cost. Option A is correct because it targets the actual risk. Option B is wrong because if the whole table is unsuitable, changing only one object may not solve the general problem. Option C is wrong because items already within correct reach do not create this height problem. Option D is wrong because whether a person stands does not by itself tell us whether an item is wrongly placed; the posture and task must be assessed. Exam cue: modify the smallest part that causes the real ergonomic difficulty.

Ergonomics is human-centred balanced work design. In exams, remember safety comfort and efficiency together.

Continuous review makes ergonomics a lasting improvement process. In exams, connect regular assessment with long-term benefit.