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COSH SO2 study materials
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COSH SO2 practice questions

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Question 1Occupational Safety and Health Legislation and Regulations

Under most national occupational safety and health statutes modelled on the ILO framework, what is the employer's primary duty regarding workplace hazards?

  1. To transfer all liability for injury to the individual worker
  2. To provide a safe working environment so far as is reasonably practicable Correct answer.
  3. To eliminate every hazard regardless of cost or technical feasibility
  4. To report hazards only after an accident has occurred

Explanation

The core general duty is to ensure health and safety so far as is reasonably practicable, balancing risk against cost, time and effort. Absolute elimination of all hazards is not the legal standard because it would make operations impossible.

Question 2Occupational Safety and Health Legislation and Regulations

In the hierarchy of control used in OSH regulations, which measure ranks highest?

  1. Providing training and signage
  2. Issuing personal protective equipment
  3. Eliminating the hazard at source Correct answer.
  4. Scheduling regular breaks

Explanation

The hierarchy of control places elimination of the hazard first because it removes the risk entirely rather than managing exposure. Administrative measures and PPE sit at the bottom because they depend on human behaviour.

Question 3Occupational Safety and Health Legislation and Regulations

What does the term 'reasonably practicable' generally require an employer to weigh?

  1. The number of employees who volunteer for a task
  2. The risk against the cost, time and difficulty of controlling it Correct answer.
  3. Only the cost of insurance premiums
  4. Only the likelihood of prosecution

Explanation

Reasonably practicable is a proportionality test: the greater the risk, the more an employer is expected to spend to control it. Cost alone is not a defence if the risk is serious.

Question 4Occupational Safety and Health Legislation and Regulations

Which party is normally responsible for consulting workers on health and safety matters under OSH legislation?

  1. The worker's family
  2. The product manufacturer
  3. The external regulator
  4. The employer Correct answer.

Explanation

Consultation duties rest with the employer, who must engage workers or their representatives on matters affecting their health and safety. Regulators enforce the duty but do not perform the consultation.

Question 5Occupational Safety and Health Legislation and Regulations

What is the principal purpose of a risk assessment required by OSH regulations?

  1. To record every near miss for statistical reporting
  2. To satisfy insurers that premiums can be reduced
  3. To prove that accidents are the worker's fault
  4. To identify hazards and decide on proportionate control measures Correct answer.

Explanation

A risk assessment identifies hazards, evaluates the likelihood and severity of harm, and determines suitable controls. It is a decision-making tool, not a blame-allocation exercise.

Question 6Occupational Safety and Health Legislation and Regulations

Which of the following best describes a worker's duty under general OSH legislation?

  1. To take reasonable care of their own and others' safety and to follow agreed controls Correct answer.
  2. To conduct the employer's risk assessments
  3. To purchase their own protective equipment
  4. To design the organisation's safety management system

Explanation

Workers have a duty of care toward themselves and colleagues and must cooperate with control measures. Designing the safety management system and providing PPE remain employer responsibilities.

Question 7Occupational Safety and Health Legislation and Regulations

What is the main function of a workplace safety committee recognised under OSH law?

  1. To provide a forum where workers and management review and improve safety matters Correct answer.
  2. To discipline workers who breach safety rules
  3. To replace the regulator's inspection function
  4. To set the company's wage structure

Explanation

Safety committees bring worker and management representatives together to review hazards, incidents and controls. They support but do not replace regulatory enforcement.

Question 8Occupational Safety and Health Legislation and Regulations

Under a typical OSH statute, which of the following must be reported to the regulator?

  1. A serious work-related injury or dangerous occurrence Correct answer.
  2. Routine staff meetings
  3. Changes to shift rosters
  4. Every minor first-aid case

Explanation

Reporting duties target serious injuries, fatalities and dangerous occurrences because these signal significant failures in control. Minor first-aid cases are normally recorded internally only.

Question 9Occupational Safety and Health Legislation and Regulations

A construction firm has a fall hazard from a roof edge. It installs guardrails rather than relying on harnesses and training. Which principle does this decision best reflect?

  1. The polluter-pays principle
  2. The hierarchy of control, by preferring an engineering control Correct answer.
  3. The principle of vicarious liability
  4. The precautionary principle, by avoiding all work at height

Explanation

Guardrails are a collective engineering control that protects everyone without relying on individual behaviour, so they rank above PPE and administrative measures in the hierarchy. The decision is a direct application of that hierarchy.

Question 10Occupational Safety and Health Legislation and Regulations

A worker refuses a task because they believe there is an imminent risk of serious injury. Under typical OSH legislation, what protection applies?

  1. The worker can be dismissed for insubordination without recourse
  2. The worker is protected from reprisal for refusing work in reasonable belief of imminent danger Correct answer.
  3. The worker must complete the task and complain afterwards
  4. The worker must obtain the regulator's written permission first

Explanation

OSH laws commonly protect workers who refuse work they reasonably believe poses an imminent and serious danger, allowing them to remain available for other work. Retaliatory dismissal would undermine the duty to protect health and safety.

Question 11Occupational Safety and Health Legislation and Regulations

An employer discovers a hazard that requires a control costing more than the annual profit of the affected department. The risk is severe and likely. How should the employer apply the reasonably practicable test?

  1. Delegate the decision to the workers affected
  2. Skip the control because it is unaffordable
  3. Implement the control, since a severe and likely risk justifies significant cost Correct answer.
  4. Wait for an accident to justify the expenditure

Explanation

The greater the risk, the greater the sacrifice an employer is expected to make to control it. A severe and likely risk will normally justify expenditure that a trivial risk would not.

Question 12Occupational Safety and Health Legislation and Regulations

A company introduces a new chemical into its process. Which regulatory step should occur before the substance is used in production?

  1. Notify the fire service of the purchase
  2. Update the risk assessment and obtain safety data and controls for the substance Correct answer.
  3. Publish the chemical's name on the company website
  4. Wait until the first worker reports symptoms

Explanation

Introducing a new substance is a change that triggers a review of the risk assessment, using hazard information such as safety data sheets to select controls. Controls must be in place before exposure can occur.

Question 13Occupational Safety and Health Legislation and Regulations

A worker is injured at work and the employer fails to notify the regulator within the required timeframe. What is the most likely legal consequence?

  1. The worker becomes personally liable for the injury
  2. The regulator automatically closes the site permanently
  3. The employer may face enforcement action or a penalty for the reporting failure Correct answer.
  4. No consequence, because reporting is voluntary

Explanation

Failure to report a notifiable incident is itself a breach of the statute and can attract enforcement action or penalties. The obligation rests on the employer, not the injured worker.

Question 14Occupational Safety and Health Legislation and Regulations

Which arrangement best satisfies an employer's duty to consult workers on health and safety?

  1. Holding regular meetings where worker representatives can raise concerns and influence decisions Correct answer.
  2. Informing workers of decisions only after they are implemented
  3. Restricting safety discussions to senior managers
  4. Posting the safety policy on a noticeboard and taking no questions

Explanation

Consultation requires a genuine two-way exchange in which workers can contribute before decisions are finalised. Simply informing workers afterwards does not meet that standard.

Question 15Occupational Safety and Health Legislation and Regulations

An employer requires workers to buy their own safety boots for a task where foot protection is a required control. How does this align with typical OSH law?

  1. It is generally non-compliant, because the employer must provide required PPE at no cost to workers Correct answer.
  2. It is acceptable if the boots are branded with the company logo
  3. It is acceptable because PPE is personal property
  4. It is acceptable if the worker is on a temporary contract

Explanation

Where PPE is required to control a risk, the employer generally must supply it free of charge because it is a control measure, not a personal expense. Charging workers can deter use and undermine the control.

Question 16Occupational Safety and Health Legislation and Regulations

A regulator inspector arrives at a site without an appointment. What is the employer's general obligation under OSH legislation?

  1. To remove all workers from the site before entry
  2. To cooperate with the inspection, including allowing access and providing requested information Correct answer.
  3. To demand that the inspector's identity be verified by the police first
  4. To refuse entry until a scheduled audit date

Explanation

Inspectors are typically empowered to enter workplaces and require cooperation, documents and access. Obstructing an inspector is itself an offence under most OSH statutes.

Question 17Occupational Safety and Health Legislation and Regulations

A manufacturing plant employs agency workers alongside permanent staff on the same production line. Who holds the primary duty to protect the agency workers' health and safety?

  1. The agency worker, because they are responsible for their own induction
  2. The agency alone, because it signs the employment contract
  3. The equipment supplier
  4. The host employer, because it controls the workplace and the work activity Correct answer.

Explanation

The host employer controls the premises and the way the work is done, so it holds the primary duty to protect everyone on site, including agency workers. The agency also has duties, but control of the workplace is decisive.

Question 18Occupational Safety and Health Legislation and Regulations

A small business argues it is exempt from OSH duties because it employs fewer than ten people. How should this be assessed?

  1. The exemption applies only to office-based businesses
  2. The exemption applies if the business has no prior accidents
  3. The general duty applies to all employers regardless of size, though compliance may be proportionate to the risk Correct answer.
  4. The exemption is valid because small firms cannot afford controls

Explanation

General duties of care typically apply to every employer, with the scale of risk and activity shaping what is reasonably practicable. Size does not remove the duty itself.

Question 19Occupational Safety and Health Legislation and Regulations

Two control options exist for a noise hazard: acoustic enclosures costing a large sum, and hearing protection costing little. Which reasoning correctly applies the hierarchy of control?

  1. Choose the enclosure if the noise risk is significant and the measure is reasonably practicable, because engineering controls rank above PPE Correct answer.
  2. Choose hearing protection because it is cheapest
  3. Choose hearing protection because PPE is always preferred in regulations
  4. Choose neither, because noise is unavoidable

Explanation

The hierarchy prefers reducing noise at source through engineering controls, and significant risk justifies greater expenditure. PPE is a last line of defence, used where higher-order controls are not reasonably practicable.

Question 20Occupational Safety and Health Legislation and Regulations

A worker representative requests access to the employer's incident records to review patterns of injury. What does typical OSH legislation provide?

  1. Representatives have no right to any records
  2. Representatives have a right to relevant health and safety information, subject to confidentiality limits Correct answer.
  3. Representatives may only view records after a fatality
  4. Representatives may publish all records publicly without restriction

Explanation

Worker representatives generally have rights to information relevant to health and safety so they can participate meaningfully in risk management. Confidentiality and personal data protections still apply.

Question 21Occupational Safety and Health Legislation and Regulations

A contractor is engaged to carry out maintenance in an operating factory. Which statement best reflects the overlapping duties under OSH law?

  1. Duties transfer to the client only if an accident occurs
  2. Both the host employer and the contractor have duties, and they must coordinate to control shared risks Correct answer.
  3. Only the contractor has duties once work begins
  4. Only the host employer has duties, because it owns the building

Explanation

Multiple duty holders can share responsibility for the same workplace, requiring coordination and exchange of hazard information. Neither party's duty disappears because another party is present.

Question 22Occupational Safety and Health Legislation and Regulations

A regulator issues an improvement notice requiring a hazard to be fixed by a set date. What is the employer's legal position?

  1. The employer must comply by the stated date or face further enforcement, and may have a right of appeal Correct answer.
  2. The notice transfers liability to the individual manager
  3. The notice is advisory and can be ignored without consequence
  4. The notice automatically shuts the business permanently

Explanation

Improvement notices are enforceable instruments with a compliance deadline, and failure to comply can lead to further enforcement action or prosecution. Most regimes allow appeal within a set period.

Question 23Occupational Safety and Health Legislation and Regulations

An employer argues that because a worker ignored a safety procedure, the employer bears no responsibility for the resulting injury. How should this be evaluated under OSH law?

  1. The employer is liable only if the regulator witnessed the event
  2. Worker misconduct always eliminates the employer's duty
  3. The employer is liable only if the worker was a permanent employee
  4. The employer must still show that it provided adequate controls, training and supervision; worker conduct is a factor, not an automatic defence Correct answer.

Explanation

The employer's duty is to establish and maintain controls, training and supervision; a worker's breach does not erase that duty. Contributory conduct may be relevant to penalty or apportionment but is not an automatic defence.

Question 24Occupational Safety and Health Legislation and Regulations

A company's safety policy is signed by the chief executive but no resources, responsibilities or review dates are assigned. How would a regulator most likely view this?

  1. As irrelevant, because written policies are optional everywhere
  2. As fully compliant because a signed policy exists
  3. As inadequate, because the policy must be implemented through defined responsibilities, resources and review Correct answer.
  4. As adequate if it is displayed in the reception area

Explanation

A safety policy is a living document that must be implemented through assigned responsibilities, adequate resources and periodic review. A signed but unimplemented policy does not demonstrate the required arrangements.

Question 25Occupational Safety and Health Legislation and Regulations

A worker suffers a gradual hearing loss after years of exposure. The employer claims the condition was not reportable because no single accident occurred. How should this be assessed?

  1. Reporting is required only if the worker requests it
  2. Occupational diseases and gradual conditions may be notifiable, so the absence of a single accident is not decisive Correct answer.
  3. Gradual conditions are the worker's private medical matter
  4. Only sudden traumatic injuries are ever notifiable

Explanation

Many OSH regimes require notification of prescribed occupational diseases and conditions arising from work, not only sudden injuries. The absence of a discrete accident does not remove the reporting duty.

Question 26Occupational Safety and Health Legislation and Regulations

Under the general duties of OSH legislation, which of the following is the primary responsibility of the employer?

  1. To transfer all safety responsibilities to the workers through signed waivers
  2. To ensure workers never make mistakes that could cause injury
  3. To provide a safe workplace and safe systems of work so far as is reasonably practicable Correct answer.
  4. To guarantee that no worker will ever be injured at work

Explanation

OSH statutes typically impose a general duty on employers to ensure health and safety so far as is reasonably practicable, which includes providing safe systems of work, plant, and substances. The duty is not absolute and does not require guaranteeing harm-free outcomes, but it does require proactive risk management.

Question 27Occupational Safety and Health Legislation and Regulations

Which of the following best describes the role of a workplace safety committee recognised under OSH legislation?

  1. To replace the employer's legal duty to manage safety
  2. To conduct regulatory inspections of other workplaces
  3. To issue on-the-spot fines to workers who breach safety procedures
  4. To review and advise on health and safety matters, including incident trends and control measures Correct answer.

Explanation

A safety committee's function is typically to facilitate cooperation between workers and management on health and safety, reviewing incidents, hazards, and control measures and making recommendations. It does not take over the employer's duty, and it has no regulatory enforcement or disciplinary fining powers.

Question 28Occupational Safety and Health Legislation and Regulations

Which of the following events is typically subject to mandatory reporting to the OSH regulator?

  1. A near miss with no injury or damage
  2. A worker taking approved annual leave
  3. A work-related fatality or serious injury Correct answer.
  4. A worker's routine medical appointment

Explanation

OSH legislation generally requires employers to notify the regulator of serious incidents such as fatalities, serious injuries, and certain dangerous occurrences. Routine matters such as leave or medical appointments are not reportable, and near misses without injury are usually not notifiable unless they fall within a specified dangerous occurrence category.

Question 29Occupational Safety and Health Legislation and Regulations

A construction firm has a fall hazard from a roof edge. It installs guardrails rather than relying on harnesses and training. Which principle of OSH law does this approach best reflect?

  1. The principle that personal protective equipment is always the first choice
  2. The principle that hazards should be controlled only after an incident occurs
  3. The hierarchy of control, by eliminating or isolating the hazard at its source Correct answer.
  4. The principle that worker training alone is sufficient to control hazards

Explanation

OSH legislation and guidance typically require duty holders to apply the hierarchy of control, prioritising elimination and engineering controls such as guardrails over administrative measures and PPE. Guardrails provide collective protection that does not depend on individual worker behaviour, making them a higher-order control.

Question 30Occupational Safety and Health Legislation and Regulations

A worker refuses a task because they believe there is an imminent risk of serious injury. Under typical OSH legislation, what protection does the worker generally have?

  1. The worker is protected from adverse action for refusing work in circumstances of serious and imminent danger Correct answer.
  2. The worker must immediately resign to avoid disciplinary action
  3. The worker must continue the task while filing a complaint afterwards
  4. The worker can be dismissed provided the employer disagrees with the risk assessment

Explanation

OSH legislation commonly protects workers who refuse to carry out work they reasonably believe involves a serious and imminent risk of injury or harm. The protection generally prohibits adverse action such as dismissal or discipline for the refusal, provided the belief is reasonable and the worker follows any required notification steps.

Question 31Occupational Safety and Health Legislation and Regulations

An employer discovers a hazard that requires a control costing more than the annual profit of the affected department. The control is technically feasible and the risk is serious. How should the employer assess its duty under a reasonably practicable standard?

  1. The employer must weigh the likelihood and severity of harm against the cost and feasibility of control, and implement controls unless grossly disproportionate Correct answer.
  2. The employer must always implement the most expensive control regardless of circumstances
  3. The employer may rely solely on worker training as a substitute for the control
  4. The employer may ignore the hazard because the cost exceeds departmental profit

Explanation

Under a reasonably practicable test, duty holders weigh the risk (likelihood and severity of harm) against the cost, time, and difficulty of implementing controls. A control is generally required unless the cost is grossly disproportionate to the risk; departmental profit alone is not the correct benchmark, and training is not an equivalent substitute for an engineering control.

Question 32Occupational Safety and Health Legislation and Regulations

A company introduces a new chemical into its process. Which regulatory step should occur before the substance is used in the workplace?

  1. Rely on the supplier's verbal assurance that the chemical is safe
  2. Obtain and review the safety data sheet and assess the risks, and comply with any registration or notification requirements Correct answer.
  3. Wait until a worker reports symptoms before assessing the chemical
  4. Use the chemical only on night shift to reduce exposure

Explanation

OSH and chemical control legislation generally require employers to obtain hazard information such as the safety data sheet, assess the risks before use, and meet any registration or notification obligations for the substance. Proactive assessment before introduction is a core requirement, and verbal assurances or shift timing are not substitutes.

Question 33Occupational Safety and Health Legislation and Regulations

A worker is injured at work and the employer fails to notify the regulator within the required timeframe. What is the most likely consequence under OSH legislation?

  1. The employer may face enforcement action, including penalties, for the failure to notify Correct answer.
  2. The employer is automatically exempt from any further investigation
  3. No consequence, because notification is voluntary
  4. The worker becomes personally liable for the notification

Explanation

Incident notification is a legal duty, and failure to notify within the prescribed timeframe can result in enforcement action such as fines or other penalties. The duty rests with the employer or person conducting the business, not the injured worker.

Question 34Occupational Safety and Health Legislation and Regulations

An employer requires workers to buy their own safety boots for a task where foot protection is a required control. How does this generally align with OSH duties?

  1. It is acceptable if workers sign a consent form
  2. It is generally not acceptable, because the employer must provide required PPE at no cost to workers Correct answer.
  3. It is acceptable if the boots are inexpensive
  4. It is acceptable because PPE is a personal item

Explanation

Where PPE is required to control a risk, OSH legislation generally places the duty on the employer to provide it, typically at no cost to the worker, along with training and maintenance. Shifting the cost to workers can deter use and is generally inconsistent with the employer's duty.

Question 35Occupational Safety and Health Legislation and Regulations

A manufacturing plant employs agency workers alongside permanent staff on the same production line. Who holds the primary OSH duty for the agency workers while they are on site?

  1. The host employer and the agency may both have duties, with the host controlling the site and the agency managing its employment obligations Correct answer.
  2. Only the agency, because it employs the workers
  3. The regulator, because it licenses the agency
  4. Only the workers themselves, because they accepted the assignment

Explanation

OSH legislation often imposes duties on both the host business that controls the workplace and the labour hire or agency employer. The host generally controls site hazards and systems of work, while the agency has duties relating to its employment relationship, so both may be responsible.

Question 36Occupational Safety and Health Legislation and Regulations

Two control options exist for a noise hazard: acoustic enclosures costing a large sum, and hearing protection costing little. The noise exposure is well above the exposure standard and enclosures are feasible. How should the employer decide?

  1. Choose acoustic enclosures if the risk is significant and the cost is not grossly disproportionate, applying the hierarchy of control Correct answer.
  2. Rotate workers so each receives less exposure without any other control
  3. Take no action until a worker suffers hearing loss
  4. Choose hearing protection because it is the cheapest option

Explanation

The hierarchy of control generally requires eliminating or reducing noise at the source through engineering controls where reasonably practicable. Hearing protection is a last line of defence, and cost is only a factor where it is grossly disproportionate to the risk; significant noise exposure usually justifies feasible engineering controls.

Question 37Occupational Safety and Health Legislation and Regulations

A worker is fatally injured when a pallet of stored material collapses. Under typical occupational safety and health legislation, which obligation does the employer owe the regulator in addition to notifying the fatality promptly?

  1. Refer the matter solely to the police, since a death is a criminal matter rather than a safety matter
  2. Preserve the scene so far as reasonably practicable and cooperate with any investigation, while recording the particulars of the event Correct answer.
  3. Remove all damaged equipment from site immediately so that production can resume without interruption
  4. Wait for the regulator to make contact before taking any internal action or gathering information

Explanation

Fatality reporting duties are normally paired with an obligation to keep the scene undisturbed so far as reasonably practicable and to record the circumstances of the event. Destroying or clearing the site before the regulator inspects it can itself be an offence because it defeats the investigation. Cooperation with inspectors is a continuing duty, not something triggered only when the regulator calls.

Question 38Occupational Safety and Health Legislation and Regulations

A warehouse operator wants to demonstrate that its safety management arrangements meet the general duty to manage risks. Which combination best evidences a systematic approach rather than a purely reactive one?

  1. A folder of incident reports compiled after each injury, with no prior assessments or scheduled reviews
  2. An annual toolbox talk covering general safety awareness for all staff, with attendance sheets retained
  3. A signed statement by senior management affirming commitment to safety, with no further supporting records
  4. A documented hazard identification and risk assessment process with assigned controls, review dates and named responsible persons Correct answer.

Explanation

A systematic approach requires proactive identification of hazards, documented risk assessments, assigned controls and periodic review with accountable persons named. Incident records, statements and general talks are supportive but do not by themselves show that foreseeable risks were assessed before harm occurred. The regulator typically looks for evidence of planning and review, not just post-event documentation.

Question 39Occupational Safety and Health Legislation and Regulations

A supervisor instructs a worker to enter a confined space to clear a blockage without testing the atmosphere, saying the job will take only a few minutes. The worker complies and is overcome by fumes. How should responsibility be analysed under typical OSH legislation?

  1. The employer and supervisor may both be liable, since the employer must provide a safe system of work and the supervisor failed to follow it Correct answer.
  2. The worker bears sole responsibility because they entered voluntarily and ignored the obvious danger
  3. No party is liable because the exposure lasted only a short period and no permanent injury occurred
  4. The supervisor bears sole responsibility because they gave the instruction, and the employer has no exposure

Explanation

Employers owe a general duty to provide a safe system of work, and supervisors or managers carry duties to implement that system in practice. A worker's compliance with an unsafe instruction does not automatically transfer liability away from those who designed or directed the unsafe method. Short duration is irrelevant: confined space risks can be fatal within seconds.

Question 40Occupational Safety and Health Legislation and Regulations

A regulator's inspector arrives without notice and asks to interview workers privately and take photographs of a production area. The employer's manager wants to refuse private interviews and permit photographs only with written consent. How should this be assessed under typical OSH legislation?

  1. The manager may refuse both requests because the visit was unannounced and no warrant was produced
  2. The inspector may take photographs but cannot interview workers without the manager present
  3. Inspectors normally have statutory powers to enter, inspect, photograph and interview in private, and obstructing those powers can itself be an offence Correct answer.
  4. The manager may refuse private interviews but must permit photographs of any area workers occupy

Explanation

OSH legislation typically confers powers of entry, inspection, sampling, photographing and private interview on authorised inspectors, often exercisable without prior notice. Refusing access or obstructing an inspector can constitute a separate offence regardless of whether the underlying safety issue is resolved. Managers cannot lawfully require consent or their own presence for worker interviews.

Question 41Hazard Identification, Risk Assessment and Control

Under the COSHH hierarchy of control, which measure should be considered first when a hazardous substance is used in a process?

  1. Provide suitable respiratory protective equipment to each operator
  2. Eliminate the substance or substitute it with a less hazardous one Correct answer.
  3. Issue written safe systems of work and train staff in their use
  4. Install local exhaust ventilation at the point of emission

Explanation

The COSHH hierarchy of control starts with eliminating the hazard, then substituting with a safer material or process, before any engineering or personal protective measures are considered. RPE, ventilation and safe systems of work are lower-order controls that are appropriate only when elimination and substitution are not reasonably practicable.

Question 42Hazard Identification, Risk Assessment and Control

A safety data sheet for a solvent states the workplace exposure limit is 100 ppm as an 8-hour time-weighted average. What does this value represent?

  1. The concentration at which the substance becomes immediately dangerous to life or health
  2. The level at which respiratory protection becomes legally mandatory regardless of duration
  3. The average airborne concentration to which workers may be exposed over a working shift Correct answer.
  4. The maximum instantaneous concentration that must never be exceeded for any period

Explanation

A time-weighted average limit is expressed for a reference period, normally eight hours, and controls the average exposure across the shift rather than any single reading. Short-term peaks are governed separately by short-term exposure limits or by the substance's own peak limitation.

Question 43Hazard Identification, Risk Assessment and Control

Which route of occupational exposure is generally responsible for the most rapid systemic absorption of a volatile organic solvent in an unventilated room?

  1. Inhalation of the vapour through the lungs Correct answer.
  2. Absorption through intact skin of the hands
  3. Injection through a contaminated puncture wound
  4. Ingestion following hand-to-mouth contact

Explanation

The lungs present a very large surface area with a thin membrane and high blood flow, so volatile vapours reach the systemic circulation rapidly by inhalation. Skin absorption and ingestion are important for some substances but are usually slower or more limited for volatile solvents.

Question 44Hazard Identification, Risk Assessment and Control

A risk assessment under COSHH must be reviewed. Which event most clearly requires a review to be triggered?

  1. The safety data sheet is filed in the electronic document system
  2. The monthly workplace inspection is completed on schedule
  3. The process changes to use a more volatile grade of the same chemical Correct answer.
  4. A new worker with the same job title joins the team

Explanation

A COSHH assessment must be reviewed whenever there is reason to suspect it is no longer valid, for example a significant change in the substance, process, quantity or control measures. Substituting a more volatile grade alters the exposure profile and invalidates the assumptions behind the existing controls.

Question 45Hazard Identification, Risk Assessment and Control

Which statement best describes the purpose of a COSHH risk assessment?

  1. To calculate the exact cost of control measures before they are purchased
  2. To certify that the workplace fully complies with all health and safety law
  3. To record every chemical held on site in a central register
  4. To decide whether the risks from hazardous substances are adequately controlled Correct answer.

Explanation

A COSHH assessment is a structured judgement of the risk arising from hazardous substances and of whether existing or proposed controls are adequate. It informs decisions about further control rather than certifying compliance or serving as a simple inventory.

Question 46Hazard Identification, Risk Assessment and Control

Air monitoring shows a worker's exposure to a dust is 6 mg/m3 as an 8-hour TWA, and the workplace exposure limit is 4 mg/m3. What is the most appropriate immediate interpretation?

  1. The result is invalid because dust should only be assessed by inhalation
  2. The exposure is acceptable provided the worker wears a dust mask voluntarily
  3. The exposure exceeds the limit and the control measures are not adequate Correct answer.
  4. The exposure is acceptable because it is within a factor of two of the limit

Explanation

When the measured eight-hour TWA exceeds the workplace exposure limit, the exposure is not adequately controlled and the employer must improve control, for example by better extraction or enclosure. A margin above the limit is not tolerated simply because it is small.

Question 47Hazard Identification, Risk Assessment and Control

Which of the following is an example of a substance that can cause occupational asthma through sensitisation?

  1. Isopropyl alcohol vapour
  2. Flour dust in a bakery Correct answer.
  3. Argon used as a shielding gas
  4. Respirable crystalline silica

Explanation

Flour dust is a well-recognised respiratory sensitiser capable of causing occupational asthma in bakers and other food workers. Sensitisation means that once a worker becomes sensitised, very low subsequent exposures can provoke an asthmatic response.

Question 48Hazard Identification, Risk Assessment and Control

What is the main purpose of local exhaust ventilation at a process that releases solvent vapour?

  1. To filter the general room air so that it can be recirculated without treatment
  2. To cool the workplace and improve operator comfort during hot processes
  3. To capture the contaminant near its source before it enters the breathing zone Correct answer.
  4. To dilute the contaminant by supplying large volumes of clean air to the room

Explanation

LEV works by capturing airborne contaminants at or close to the point of generation so they are removed before reaching the worker's breathing zone. It is a source-control measure and is quite different from dilution ventilation.

Question 49Hazard Identification, Risk Assessment and Control

A worker decants a corrosive liquid from a large drum into smaller containers. Which combination best reflects good practice for controlling splash and mist exposure?

  1. Using a drum pump with a drip tray and suitable eye and hand protection Correct answer.
  2. Working in the open with no controls because the operation is brief
  3. Asking the worker to hold their breath while pouring quickly
  4. Relying on a general extraction fan mounted on the far wall

Explanation

A drum pump reduces manual handling and the generation of splashes and mist, while a drip tray contains spills and suitable eye and hand protection addresses residual risk. This combines an engineering measure with personal protection appropriate to a corrosive liquid.

Question 50Hazard Identification, Risk Assessment and Control

Why is biological monitoring sometimes used alongside air monitoring for substances such as lead or certain solvents?

  1. It identifies the specific brand of chemical product being used in the process
  2. It provides a cheaper alternative that removes the need for any air sampling
  3. It measures the concentration of the substance in the air at the breathing zone
  4. It measures the amount of substance or its metabolite taken into the body by all routes Correct answer.

Explanation

Biological monitoring assesses internal dose by measuring the substance or its metabolites in blood, urine or breath, and therefore accounts for uptake by inhalation, ingestion and skin absorption. It complements air monitoring, which only estimates airborne concentration.