NEBOSH Health and Safety Management for Construction (UK) — Questions and Answers

Question 1: What gas commonly accumulates in excavations on sites previously used for organic waste disposal?

Carbon dioxide
Nitrogen
Methane (Correct answer)
Argon

Correct answer: Methane

Methane is a highly flammable gas produced by the biological decomposition of organic matter. It accumulates in excavations on former landfill or organic waste sites and can cause fire, explosion or asphyxiation.

Question 2: What is the maximum noise exposure level (daily or weekly average) above which an employer must provide hearing protection zones on a construction site under the Control of Noise at Work Regulations 2005?

87 dB(A) — the exposure limit value
80 dB(A) — the lower exposure action value
70 dB(A)
85 dB(A) — the upper exposure action value (Correct answer)

Correct answer: 85 dB(A) — the upper exposure action value

At the upper exposure action value of 85 dB(A), employers must establish hearing protection zones, ensure hearing protection is worn, and implement a programme of noise reduction measures. At 80 dB(A) (lower action value), hearing protection must be made available. The exposure limit of 87 dB(A) must never be exceeded (measured at the ear, taking account of hearing protection).

Question 3: What is the role of a fire marshal on a construction site?

To assist with evacuation, check their designated area is clear, account for personnel, and report to the assembly point (Correct answer)
To issue fire permits only
To fight all fires regardless of size
To maintain fire extinguishers only

Correct answer: To assist with evacuation, check their designated area is clear, account for personnel, and report to the assembly point

Fire marshals (or fire wardens) are trained personnel responsible for assisting evacuation procedures, sweeping their designated area to ensure it is clear, directing people to assembly points, accounting for personnel, and reporting to the site fire coordinator. They should not attempt to fight fires beyond their training and equipment.

Question 4: What are the key elements of a manual handling risk assessment on a construction site using the TILE acronym?

Time, Inspection, Lifting, and Equipment
Task, Individual, Load, and Environment (Correct answer)
Training, Insurance, Legislation, and Enforcement
Temperature, Illumination, Layout, and Ergonomics

Correct answer: Task, Individual, Load, and Environment

TILE is the framework for manual handling assessment: Task (does it involve twisting, stooping, reaching?), Individual (does the worker have any health conditions affecting capability?), Load (is it heavy, bulky, unstable, difficult to grip?), and Environment (are there space constraints, uneven floors, temperature extremes?). Each element must be assessed and controls applied.

Question 5: A building is to be demolished. Under CDM 2015, what specific document must be prepared before demolition work begins?

A structural warranty certificate
A verbal agreement between the client and contractor
A detailed demolition method statement prepared by a competent person, included within the construction phase plan (Correct answer)
A planning permission document only

Correct answer: A detailed demolition method statement prepared by a competent person, included within the construction phase plan

CDM 2015 Regulation 20 requires that demolition or dismantling of a structure is planned and carried out in a safe manner under the supervision of a competent person. A detailed method statement must be prepared, describing the sequence of demolition, structural stability measures, hazardous material removal (especially asbestos), and exclusion zones.

Question 6: What is the maximum recommended height for a free-standing mobile tower scaffold used outdoors?

The height should not exceed a base-to-height ratio of 1:3 outdoors (or 1:3.5 indoors) (Correct answer)
Any height provided it has outriggers
There is no height limit
10 metres regardless of base width

Correct answer: The height should not exceed a base-to-height ratio of 1:3 outdoors (or 1:3.5 indoors)

For stability, mobile tower scaffolds should not exceed a base-to-height ratio of 1:3 outdoors and 1:3.5 indoors. PASMA guidance provides specific recommendations. Outriggers and stabilisers can increase the effective base dimension. The scaffold must never be moved with persons or loose materials on the platform.

Question 7: What is the correct sequence for demolishing a multi-storey building using the top-down method?

Remove alternate floors to weaken the structure
Remove hazardous materials first, then demolish storey by storey from the top downwards, ensuring structural stability at each stage (Correct answer)
Use explosives on all floors simultaneously
Demolish the ground floor first to bring the building down

Correct answer: Remove hazardous materials first, then demolish storey by storey from the top downwards, ensuring structural stability at each stage

Top-down demolition is the reverse of construction: remove hazardous materials (asbestos, chemicals), soft strip internal fittings, then demolish floor by floor from the top. Structural stability must be maintained at each stage. This method is common in urban areas where controlled collapse is not possible due to proximity of other buildings.

Question 8: What is the most common type of occupational ill health in the UK construction industry?

Skin diseases
Respiratory diseases
Musculoskeletal disorders (Correct answer)
Hearing loss

Correct answer: Musculoskeletal disorders

Musculoskeletal disorders (MSDs) are the most common type of occupational ill health in construction, caused by manual handling of heavy materials, repetitive movements, awkward postures, and whole-body vibration. The Manual Handling Operations Regulations 1992 require employers to avoid hazardous manual handling where reasonably practicable.

Question 9: What device provides protection against electrocution by detecting earth leakage current and cutting off the supply within milliseconds?

Fuse
Residual Current Device (RCD) (Correct answer)
Isolation switch
Miniature Circuit Breaker (MCB)

Correct answer: Residual Current Device (RCD)

A Residual Current Device (RCD) detects any difference between the current in the live and neutral conductors, indicating a fault or leakage to earth, and disconnects the supply within 30 milliseconds — fast enough to prevent electrocution.

Question 10: CDM 2015 requires a construction phase plan to be prepared before the construction phase begins. Who must prepare this document?

Principal Contractor (Correct answer)
Client
Principal Designer
Health and Safety Executive

Correct answer: Principal Contractor

The Principal Contractor must prepare the construction phase plan before construction begins. It sets out the health and safety arrangements for managing the project during the construction phase.

Question 11: What does the term 'biological monitoring' mean in the context of occupational health on construction sites?

Counting the number of sick days taken by workers
Measuring the concentration of a substance or its metabolite in a worker's blood, urine, or breath to assess actual body uptake (Correct answer)
Checking the biological safety of drinking water
Monitoring for insects and rodents on site

Correct answer: Measuring the concentration of a substance or its metabolite in a worker's blood, urine, or breath to assess actual body uptake

Biological monitoring measures how much of a hazardous substance has actually been absorbed by the body, regardless of the route of exposure. For example, blood lead levels for lead exposure, urine chromium for hexavalent chromium exposure, or urinary metabolites for isocyanate exposure. This complements air monitoring and health surveillance.

Question 12: What is the hierarchy of measures under the Work at Height Regulations 2005?

Personal fall arrest is the preferred control measure
Avoid working at height, prevent falls using collective measures, then mitigate consequences (Correct answer)
Use PPE first, then collective measures
Mitigate consequences first, then avoid working at height

Correct answer: Avoid working at height, prevent falls using collective measures, then mitigate consequences

The WAH Regulations hierarchy requires: first, avoid working at height where reasonably practicable; second, prevent falls with collective measures (such as scaffolding); third, mitigate the consequences of a fall (such as safety nets).

Question 13: What must a fire risk assessment on a construction site identify?

The names of all site workers for evacuation purposes
Fire hazards, people at risk, existing controls, adequacy of means of escape and fire fighting equipment (Correct answer)
Only the location of extinguishers
The cost of installing a fire suppression system

Correct answer: Fire hazards, people at risk, existing controls, adequacy of means of escape and fire fighting equipment

A fire risk assessment must identify fire hazards (sources of ignition, fuel and oxygen), people at risk (including visitors and contractors), evaluate existing controls, and ensure adequate means of escape, fire detection and fighting equipment.

Question 14: What is the main risk when excavating in contaminated land?

Damage to underground services
Increased ground instability
Exposure to harmful substances including toxic gases, chemicals and biological hazards (Correct answer)
Difficulty in using standard shoring equipment

Correct answer: Exposure to harmful substances including toxic gases, chemicals and biological hazards

Excavating contaminated land exposes workers to toxic gases (such as methane and hydrogen sulphide), chemicals, asbestos and biological hazards. Air monitoring and appropriate PPE including respiratory protection are essential.

Question 15: What does 'substitution' mean as a control for dust hazards on a construction site?

Using a substitute substance that is more hazardous
Substituting one type of PPE for another
Replacing a high-dust-generating process or material with one that produces less dust (Correct answer)
Replacing one COSHH assessment with another

Correct answer: Replacing a high-dust-generating process or material with one that produces less dust

Substitution as a control means replacing a process or material that generates high levels of hazardous dust with one that produces less. For example, using pre-mixed mortar instead of dry mixing on site, or buying pre-cut materials.

Question 16: Which underground service is typically identified by a yellow or yellow-striped pipe in the UK?

Telecommunications
Electricity
Water
Gas (Correct answer)

Correct answer: Gas

Gas pipes in the UK are typically yellow or have yellow stripes. Identifying the correct service by colour helps workers determine the type of hazard they may encounter during excavation.

Question 17: What are the three elements required to sustain a fire (the fire triangle)?

Fuel, oxygen and heat (ignition source) (Correct answer)
Fuel, oxygen and carbon dioxide
Fuel, nitrogen and heat
Oxygen, nitrogen and heat

Correct answer: Fuel, oxygen and heat (ignition source)

The fire triangle represents the three essential elements needed to start and sustain a fire: fuel (combustible material), oxygen (from the air or oxidising agent) and heat (ignition source). Removing any one element will extinguish the fire.

Question 18: Which of the following items is classified as a lifting accessory under LOLER 1998?

A tower crane
A chain block hoist
A mobile elevating work platform (MEWP)
A wire rope sling (Correct answer)

Correct answer: A wire rope sling

Wire rope slings are lifting accessories — they are used to connect the load to lifting equipment; cranes, MEWPs and chain blocks are classified as lifting equipment.

Question 19: Leptospirosis (Weil's disease) is a risk on construction sites. How is it transmitted and what workers are most at risk?

Transmitted by airborne droplets; office workers are most at risk
Transmitted by insect bites; workers in rural areas only
Transmitted through contact with water or soil contaminated with infected rat urine; workers in excavations, drains, and waterways are most at risk (Correct answer)
Transmitted by skin contact with cement; bricklayers are most at risk

Correct answer: Transmitted through contact with water or soil contaminated with infected rat urine; workers in excavations, drains, and waterways are most at risk

Leptospirosis is caused by Leptospira bacteria found in rat urine. It enters through cuts, abrasions, or mucous membranes following contact with contaminated water or soil. Construction workers in excavations, drainage work, and near waterways are at highest risk. Controls include covering cuts, washing hands, wearing gloves, and not eating or drinking near contaminated areas.

Question 20: What is the fire risk associated with polyurethane foam insulation boards on a construction site?

They present no significant fire risk if kept dry
They are highly combustible and produce toxic smoke when burning, spreading fire rapidly (Correct answer)
They only pose a risk when cut
They are naturally fire resistant and require no precautions

Correct answer: They are highly combustible and produce toxic smoke when burning, spreading fire rapidly

Polyurethane foam insulation boards are highly combustible and produce large quantities of dense, toxic smoke when burning. They can contribute to rapid fire spread and have been involved in serious construction site fires. Storage and use must be carefully managed.

Question 21: Construction workers are exposed to UV radiation from the sun. What is the long-term health risk and what controls should be implemented?

Eye strain from bright light only
Skin cancer (including melanoma); controls include scheduling work to avoid peak UV, providing shade, and covering exposed skin (Correct answer)
Sunburn only with no long-term effects
Vitamin D deficiency

Correct answer: Skin cancer (including melanoma); controls include scheduling work to avoid peak UV, providing shade, and covering exposed skin

Outdoor construction workers have significantly higher rates of skin cancer due to chronic UV exposure. Controls include scheduling outdoor work outside peak UV hours (11am-3pm), providing shade for break areas, wearing long-sleeved clothing and wide-brimmed hats, and applying sunscreen (minimum SPF 30). Awareness training about skin checks is also important.

Question 22: What type of hearing loss is caused by prolonged exposure to excessive noise?

Temporary threshold shift that recovers with rest
Tinnitus that always resolves after leaving the noisy environment
Conductive hearing loss that can be treated surgically
Noise-induced hearing loss (NIHL), which is permanent and irreversible (Correct answer)

Correct answer: Noise-induced hearing loss (NIHL), which is permanent and irreversible

Noise-induced hearing loss (NIHL) is caused by prolonged exposure to excessive noise levels. The damage to hair cells in the cochlea is cumulative, permanent and irreversible. There is no medical treatment that restores lost hearing.

Question 23: A worker needs to access a roof to carry out a brief inspection lasting approximately 15 minutes. What is the most appropriate form of access?

An unsecured ladder leaning against the gutter
A mobile elevated work platform (MEWP) providing edge protection at roof level (Correct answer)
Climbing up the scaffolding poles
Using a rope thrown over the ridge

Correct answer: A mobile elevated work platform (MEWP) providing edge protection at roof level

A MEWP (cherry picker) provides a safe working platform with built-in guardrails, is suitable for short-duration tasks, and can position the worker at the correct height without requiring them to step onto the roof. Ladders should only be used for access to height, not as a work platform, unless the task is very short and low-risk.

Question 24: What protective measures should be in place around an open excavation to prevent people and vehicles from falling in?

Substantial barriers or guardrails, clear warning signage, and edge protection (Correct answer)
Cones placed along the edge
Warning tape only
Verbal warnings to workers at the start of each shift

Correct answer: Substantial barriers or guardrails, clear warning signage, and edge protection

Open excavations must be protected by substantial barriers (not tape alone) to prevent persons and vehicles from falling in. Guardrails should meet the same standards as for work at height (950mm top rail, toe board, intermediate rail). Clear warning signs, lighting for night-time, and vehicle stop blocks should also be provided.

Question 25: What is the effect of frequent twisting during lifting operations?

Twisting combines bending and rotation forces on the spine, significantly increasing the risk of disc and muscle injury (Correct answer)
Twisting reduces the load on the lumbar spine
Twisting is only risky if the load exceeds 25kg
Twisting improves load control and reduces injury risk

Correct answer: Twisting combines bending and rotation forces on the spine, significantly increasing the risk of disc and muscle injury

Twisting while lifting combines compressive forces from the load with rotational forces on the intervertebral discs and supporting muscles. This combination significantly increases injury risk, especially to the lumbar spine.

Question 26: A self-employed person working on a construction site has duties under CDM 2015 equivalent to which employed duty holder?

Designer
Principal Contractor
Worker
Contractor (Correct answer)

Correct answer: Contractor

Under CDM 2015, self-employed persons are treated in the same way as contractors. They have the same duties as contractors and must comply with relevant legal requirements just as an employed contractor would.

Question 27: What minimum qualification should an electrician have to carry out electrical installation work on a construction site?

Demonstrable competence such as an NVQ Level 3 or equivalent with relevant experience (Correct answer)
Completion of a one-day electrical safety course
Any City & Guilds qualification
A first aid certificate

Correct answer: Demonstrable competence such as an NVQ Level 3 or equivalent with relevant experience

Electricians carrying out installation work should be competent, typically demonstrated by holding an NVQ Level 3 in Electrical Installations or equivalent, with relevant practical experience. Competence must be appropriate to the specific work.

Question 28: What is the role of a scaffold tag system on a construction site?

To record the name of the scaffold designer
To identify the scaffolding company that erected the structure
To communicate the inspection status of a scaffold to all workers (Correct answer)
To log the weight limit of the scaffold

Correct answer: To communicate the inspection status of a scaffold to all workers

A scaffold tag system uses colour-coded tags (typically red, amber and green) to communicate the inspection status of a scaffold. Red means do not use, amber means restricted use, and green means safe to use. This helps prevent use of unsafe scaffolds.

Question 29: Under the Control of Substances Hazardous to Health Regulations 2002 (COSHH), what is the hierarchy of control for managing exposure to hazardous substances?

Train workers and rely on their vigilance
Eliminate, substitute, enclose, LEV, safe systems of work, then PPE as last resort (Correct answer)
Provide PPE first, then consider other measures
Monitor exposure and treat any health effects

Correct answer: Eliminate, substitute, enclose, LEV, safe systems of work, then PPE as last resort

COSHH requires a hierarchy: first eliminate the substance; if not possible, substitute with a less hazardous alternative; then use engineering controls (enclosure, local exhaust ventilation); then administrative controls (safe systems of work, reduced exposure time); and finally PPE as a last resort. PPE should never be the primary control.

Question 30: Under the Health and Safety at Work etc. Act 1974, what must an employer provide to employees free of charge?

All of the above (Correct answer)
Personal protective equipment
A written statement of general health and safety policy
Information, instruction, training and supervision

Correct answer: All of the above

HASAWA requires employers to provide PPE free of charge, as well as information, instruction, training and supervision. Employers with five or more employees must also provide a written health and safety policy.

Question 31: What is a 'lockout/tagout' procedure in electrical safety?

A procedure for locking the distribution board cabinet
A system for physically locking electrical isolation points and tagging them to prevent accidental re-energisation (Correct answer)
A method for identifying circuits on a distribution board
A record of the electrical circuits isolated during a shutdown

Correct answer: A system for physically locking electrical isolation points and tagging them to prevent accidental re-energisation

Lockout/tagout (LOTO) involves physically locking the isolation point with a padlock (so only the keyholder can re-energise) and attaching a tag identifying who has locked out the supply and what work is being done. It prevents accidental re-energisation.

Question 32: Under the Management of Health and Safety at Work Regulations 1999, which employers must appoint a competent person to assist them with health and safety?

Only employers with more than 50 workers
All employers (Correct answer)
Only employers in high-risk industries
Only employers with a history of accidents

Correct answer: All employers

The MHSWR 1999 requires all employers to appoint one or more competent persons to assist them in undertaking the measures needed to comply with health and safety law. This applies to all employers regardless of size or sector.

Question 33: Asbestos is still present in many buildings being refurbished or demolished. What types of asbestos work require a licence from the HSE?

Work with asbestos insulation, asbestos coating, and asbestos insulating board (unless meeting exemption conditions) (Correct answer)
No licence is ever required for asbestos work
Only work with blue asbestos (crocidolite)
All work that encounters asbestos of any type

Correct answer: Work with asbestos insulation, asbestos coating, and asbestos insulating board (unless meeting exemption conditions)

Under the Control of Asbestos Regulations 2012, a licence from HSE is required for work with asbestos insulation, asbestos coating, and asbestos insulating board (AIB), unless the work meets specific exemption conditions (short duration, low disturbance). Work with asbestos cement and textured coatings is non-licensable but still requires compliance with the regulations.

Question 34: What is the minimum width of a working platform on a scaffold?

300mm
900mm
450mm
600mm (Correct answer)

Correct answer: 600mm

Under the Work at Height Regulations 2005, a working platform from which a person could fall must be a minimum of 600mm wide to allow safe working and movement. Wider platforms are required for certain activities.

Question 35: How should spoil from an excavation be managed to prevent it becoming a hazard?

Always removed from site immediately
Stored as close to the edge as possible for convenience
Deposited randomly around the site
Stored at least 1 metre from the edge and in a controlled manner to prevent overloading (Correct answer)

Correct answer: Stored at least 1 metre from the edge and in a controlled manner to prevent overloading

Excavated spoil must be stored at least 1 metre from the excavation edge to prevent overloading and collapse. It should be managed to avoid creating trip hazards or obstructing emergency exits.

Question 36: What is the maximum height a ladder should project above the landing point?

At least 0.5 metres above the landing point
At least 0.75 metres above the landing point
At least 1 metre above the landing point (Correct answer)
At least 2 metres above the landing point

Correct answer: At least 1 metre above the landing point

Ladders should project at least 1 metre above the landing point to provide a handhold when stepping on and off the ladder. This helps prevent overbalancing when transitioning from the ladder to the working platform.

Question 37: What is a Workplace Exposure Limit (WEL) and how is it used in construction health risk management?

The maximum concentration of an airborne substance averaged over a reference period, above which exposure should not occur (Correct answer)
The longest shift length permitted by law
The minimum temperature at which work should stop
The maximum weight that can be manually handled

Correct answer: The maximum concentration of an airborne substance averaged over a reference period, above which exposure should not occur

A WEL is the maximum concentration of an airborne substance (expressed in mg/m3 or ppm) to which workers may be exposed, averaged over either 8 hours (long-term) or 15 minutes (short-term). WELs are listed in EH40. Exposure must be reduced to as low as reasonably practicable, and in any case must not exceed the WEL.

Question 38: What is the risk of leaving an excavation open overnight on a public site?

Noise from settling soil disturbing nearby residents
Unauthorised entry and falls, particularly by children (Correct answer)
Soil drying out and becoming unstable
Increased erosion from overnight dew

Correct answer: Unauthorised entry and falls, particularly by children

Leaving excavations open overnight creates a risk of unauthorised entry, particularly by children. Robust barriers, warning lights and even covering the excavation may be required to prevent falls outside working hours.

Question 39: Which technique is used to check for the presence of underground cables using radio frequency detection?

Ultrasonic testing
Ground Penetrating Radar only
Trial pit excavation
Cable Avoidance Tool (CAT) scanning (Correct answer)

Correct answer: Cable Avoidance Tool (CAT) scanning

A Cable Avoidance Tool (CAT scanner) uses electromagnetic signals to detect buried electricity cables, gas and water mains, and other services. Used with a signal generator (genny), it significantly reduces the risk of striking services.

Question 40: Which type of support system uses horizontal boards (poling boards) held in place by adjustable struts?

Sheet piling
Hydraulic shoring
Timbering (traditional shoring) (Correct answer)
Trench boxes

Correct answer: Timbering (traditional shoring)

Traditional timber shoring (timbering) uses vertical poling boards held in position by horizontal walings and adjustable struts to prevent the sides of an excavation from collapsing.

Question 41: Mental health is increasingly recognised as a significant issue in the UK construction industry. What workplace factors contribute to poor mental health among construction workers?

Only office-based construction staff are affected
Mental health is a personal issue unrelated to work
Long working hours, job insecurity, time away from family, demanding physical work, bullying culture, and financial pressures (Correct answer)
Construction workers do not experience mental health issues

Correct answer: Long working hours, job insecurity, time away from family, demanding physical work, bullying culture, and financial pressures

The UK construction industry has disproportionately high rates of mental ill health and suicide. Contributing factors include long and irregular hours, job insecurity (especially for self-employed workers), time away from home, physically demanding work, a culture that discourages discussing mental health, and financial pressures from subcontracting chains. Employers have a duty to assess psychosocial risks.

Question 42: Under the Construction (Design and Management) Regulations 2015 (CDM 2015), who has the duty to appoint a principal designer and principal contractor on projects involving more than one contractor?

The principal contractor
The client (Correct answer)
The local authority
The Health and Safety Executive

Correct answer: The client

Under CDM 2015, the client has the legal duty to appoint a principal designer and principal contractor for projects involving more than one contractor. If the client fails to make these appointments, they assume the duties of these roles themselves.

Question 43: What is the meaning of 'isolation' in electrical safety?

Switching equipment to standby mode
Disconnecting electrical equipment from all sources of supply and securing so it cannot be inadvertently re-energised (Correct answer)
Turning off the main switch only
Removing the fuse only

Correct answer: Disconnecting electrical equipment from all sources of supply and securing so it cannot be inadvertently re-energised

Isolation means completely disconnecting equipment from all electrical energy sources and securing the isolation (e.g., with a lock) to prevent inadvertent re-energisation. Simply switching off is not sufficient — the supply must be physically disconnected.

Question 44: A construction worker regularly cuts concrete blocks with a disc cutter. What is the primary health risk and what control measure is most effective?

Noise exposure; ear plugs are most effective
UV exposure; sunscreen is most effective
Whole-body vibration; anti-vibration gloves are most effective
Respirable crystalline silica causing silicosis; water suppression or on-tool extraction is most effective (Correct answer)

Correct answer: Respirable crystalline silica causing silicosis; water suppression or on-tool extraction is most effective

Cutting concrete generates respirable crystalline silica (RCS) dust, which causes silicosis and is associated with lung cancer. Water suppression (wet cutting) or on-tool local exhaust ventilation (LEV) are the most effective controls as they capture dust at source. RPE should be used as additional protection, not as the primary control.

Question 45: A construction worker develops occupational asthma from exposure to isocyanates in two-pack spray paints. Under UK health and safety law, what should the employer have done to prevent this?

Nothing — occupational asthma cannot be prevented
Ensured the worker was not allergic before employment
Carried out a COSHH assessment, provided LEV or RPE with assigned protection factor, health surveillance, and training on isocyanate risks (Correct answer)
Provided a basic dust mask

Correct answer: Carried out a COSHH assessment, provided LEV or RPE with assigned protection factor, health surveillance, and training on isocyanate risks

Isocyanates are a leading cause of occupational asthma. Under COSHH, the employer must assess the risk, consider elimination or substitution (e.g., brush application instead of spraying), provide engineering controls (LEV, spray booths), supply suitable RPE with adequate assigned protection factor, implement health surveillance, and provide information and training.

Question 46: What colour is typically used for 110V electrical supply equipment on UK construction sites?

Red
Yellow (Correct answer)
Blue
Orange

Correct answer: Yellow

110V electrical equipment and leads on UK construction sites are colour-coded yellow to distinguish them from 230V (blue for single phase) and 415V (red for three phase) equipment, helping workers identify the correct supply voltage.

Question 47: Which permit-to-work system is used for excavation work near live underground services?

Excavation permit (Correct answer)
Confined space entry permit
Hot work permit
Electrical isolation permit

Correct answer: Excavation permit

An excavation permit is used when working near live underground services. It records the checks carried out, identifies the services present, specifies the methods to be used and identifies who has authorised the work.

Question 48: A construction worker falls 4 metres from a scaffold and is suspended in their safety harness. What is the main risk from prolonged suspension in a harness?

Sunburn
Hypothermia only
Suspension trauma (orthostatic intolerance) which can be fatal within 30 minutes (Correct answer)
Boredom

Correct answer: Suspension trauma (orthostatic intolerance) which can be fatal within 30 minutes

Suspension trauma (also called harness hang syndrome) occurs when blood pools in the legs during prolonged vertical suspension, reducing venous return and cardiac output. It can cause unconsciousness within minutes and death within 30 minutes. A rescue plan must be in place before any work at height involving harnesses.

Question 49: What is the purpose of health surveillance under the COSHH Regulations?

To satisfy insurance requirements only
To detect early signs of work-related ill health so that action can be taken to prevent progression (Correct answer)
To determine whether workers are fit for employment
To monitor productivity levels

Correct answer: To detect early signs of work-related ill health so that action can be taken to prevent progression

Health surveillance aims to detect adverse health effects at an early, reversible stage. For construction workers, this may include lung function testing (for dust exposure), skin checks (for cement dermatitis), hearing tests (for noise exposure), and HAVS assessments. Results should feed back into risk assessment to improve controls.

Question 50: What is the purpose of a 'walkway' or bridge over an excavation?

To act as a shoring system at the top of the excavation
To allow safe pedestrian crossing without the risk of falling in (Correct answer)
To measure the width of the trench
To support the weight of heavy plant over the excavation

Correct answer: To allow safe pedestrian crossing without the risk of falling in

A properly constructed walkway or bridge with guard rails allows workers and pedestrians to cross an open excavation safely, eliminating the risk of falls into the trench.

NEBOSH Health and Safety Management for Construction (UK)

The NEBOSH Construction Certificate (CN1) assesses health and safety knowledge for the construction industry, covering CDM regulations, site hazards, risk management, and hazard control across 13 syllabus elements. It is an open-book, scenario-based assessment requiring candidates to apply their knowledge to realistic construction workplace situations.

Questions

60 min

Time Limit

45%

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