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Key Facts: NEBOSH IDip Exam

RQF Level 6

Qualification Level

NEBOSH / Ofqual

42 credits

Credit Value

NEBOSH

3 units

DI1, DI2 and DI3

NEBOSH 2023 specification

650 marks

Total Across Units

NEBOSH (DI1 300, DI2 175, DI3 175)

50%

Pass Mark Per Unit

NEBOSH

150-195

Overall Pass Band

NEBOSH grading

ILO-OSH 2001

Management-System Basis

International Labour Organization

The NEBOSH International Diploma (IDipNEBOSH) is a degree-level RQF Level 6, 42-credit qualification for aspiring senior OSH professionals, and the international version of the National Diploma using ILO law instead of UK statute. Its three units are DI1 Workplace health and safety principles (a practical assignment covering ILO conventions C155/C161/C187, ILO-OSH 2001, ISO 45001, safety culture, human factors, risk-management techniques and contractor management), DI2 Controlling workplace health issues (a case study on occupational health, toxicology, hazardous substances, noise, vibration, radiation, musculoskeletal disorders and mental health) and DI3 Controlling workplace safety issues (a case study on fire and explosion, work equipment and machinery, electricity, confined spaces, construction and workplace transport). Each unit is marked from 650 total marks (DI1 300, DI2 175, DI3 175) and needs 50% to pass; the combined mark sets Pass (150-195), Credit (196-225) or Distinction (226+). The current specification launched in July 2023, and English at IELTS 7.0 level is recommended.

Sample NEBOSH IDip Practice Questions

Try these sample questions to review concepts for the NEBOSH IDip exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1An employer adopts the ILO-OSH 2001 guidelines to structure its safety management system. According to those guidelines, which sequence correctly lists the five main elements of the system at organisational level?

A.Policy; organising; planning and implementation; evaluation; action for improvement

B.Hazard identification; risk assessment; control; review; certification

C.Plan; do; check; act; audit

D.Leadership; commitment; competence; communication; consultation

Explanation: ILO-OSH 2001 sets out five interrelated elements at organisational level: Policy, Organising, Planning and implementation, Evaluation, and Action for improvement, operating in a continual-improvement (Plan-Do-Check-Act style) cycle.

2ILO Convention C155 (Occupational Safety and Health Convention, 1981) is a foundational instrument referenced throughout the International Diploma. What is its primary purpose?

A.To set a binding worldwide noise exposure limit of 85 dB(A)

B.To require ratifying states to formulate, implement and periodically review a coherent national OSH policy

C.To establish occupational health services in every workplace with more than 50 workers

D.To create an international certification scheme for safety practitioners

Explanation: C155 requires each ratifying member state to formulate, implement and periodically review a coherent national policy on occupational safety, health and the working environment, allocating duties to governments, employers and workers.

3An international organisation wants to certify its safety management system to a recognised standard. Which current standard should it select, and what key concept did it introduce compared with the standard it replaced?

A.OHSAS 18001, which first introduced worker consultation requirements

B.ISO 9001, which introduced the process approach to safety

C.ISO 45001, which embedded the organisational context and a stronger leadership/worker-participation focus using the Annex SL high-level structure

D.ISO 14001, which introduced the concept of significant aspects to safety

Explanation: ISO 45001:2018 replaced OHSAS 18001 and uses the Annex SL high-level structure, explicitly requiring understanding of organisational context, strong top-management leadership, and worker participation/consultation.

4Socio-legal models of health and safety regulation are studied in DI1. A 'goal-setting' (self-regulatory) regulatory approach differs from a 'prescriptive' approach mainly because it:

A.Specifies the exact technical control measures employers must install

B.Sets the standard of outcome to be achieved and leaves duty-holders to determine how to achieve it, often supported by guidance and codes of practice

C.Removes all employer duties and relies solely on workers protecting themselves

D.Applies only to the public sector and not to private companies

Explanation: Goal-setting/self-regulatory regimes (the Robens philosophy) set the required outcome or standard and rely on duty-holders to decide appropriate means, typically supported by approved codes of practice and guidance.

5ILO Convention C161 (Occupational Health Services Convention, 1985) requires the progressive development of occupational health services. These services are described in the Convention as essentially:

A.Enforcement bodies with powers to prosecute employers

B.Insurance schemes that pay compensation for industrial injury

C.Bodies that issue international competence certificates to doctors

D.Preventive functions advising the employer, workers and their representatives on maintaining a safe and healthy working environment

Explanation: C161 defines occupational health services as having an essentially preventive function, responsible for advising employers, workers and representatives on creating and maintaining a safe and healthy working environment and on adaptation of work to workers.

6ILO Convention C187 (Promotional Framework for Occupational Safety and Health Convention, 2006) is significant because it promotes which overarching concept for managing OSH at national level?

A.A zero-tolerance fines regime for all accidents

B.A national preventative safety and health culture and continuous improvement of the national OSH system

C.Mandatory privatisation of all enforcement functions

D.A single global occupational exposure limit list

Explanation: C187 promotes the development of a national preventative safety and health culture and the progressive achievement of a safe and healthy working environment through a national OSH system, programme and policy that are continually improved.

7In jurisdictions based on common-law tort, for a worker to succeed in a civil claim of negligence against an employer, the claimant must generally establish three things. These are:

A.Intent, recklessness and a criminal conviction

B.A written contract, a witness statement and a doctor's note

C.A breach of statutory duty, a prohibition notice and an insurance policy

D.A duty of care was owed, that duty was breached, and the breach caused foreseeable loss or harm

Explanation: Negligence requires the claimant to prove that a duty of care was owed, that the defendant breached that duty by failing to meet the reasonable standard, and that the breach caused reasonably foreseeable damage.

8The doctrine of vicarious liability is relevant to employer civil liability. It means that:

A.An employer can be held liable for the negligent acts of an employee committed in the course of employment

B.A worker is always personally liable and the employer is never responsible

C.Liability passes automatically to the insurer with no employer involvement

D.Only directors, never the organisation, can be held liable for harm

Explanation: Vicarious liability holds an employer responsible for the wrongful (negligent) acts or omissions of its employees committed in the course of their employment, even where the employer was not personally at fault.

9Many national enforcement systems give inspectors the power to issue notices. The key difference between a typical 'improvement notice' and a 'prohibition notice' is that a prohibition notice:

A.Gives the duty-holder time to remedy a contravention while work continues

B.Is used to stop an activity that involves a risk of serious personal injury, with effect immediately or after a stated time

C.Can only be issued by a court after a criminal trial

D.Imposes a fixed financial penalty but allows the activity to continue

Explanation: A prohibition notice halts an activity that the inspector believes involves a risk of serious personal injury; it can take immediate or deferred effect. An improvement notice, by contrast, allows time to remedy a contravention while work continues.

10DI1 considers the role of insurance companies as external influences on health and safety. The main way insurers drive improved OSH standards is by:

A.Acting as the legal enforcement authority that prosecutes employers

B.Providing free occupational health services to all insured workers

C.Writing national occupational safety legislation

D.Setting premiums and conditions linked to risk, and using surveys and claims experience to require improvements

Explanation: Insurers influence OSH by risk-rating premiums, attaching conditions and warranties, conducting risk surveys, and adjusting cover based on claims experience, creating a financial incentive for employers to manage risk.

About the NEBOSH IDip Exam

The NEBOSH Level 6 International Diploma for Occupational Health and Safety Management Professionals (IDipNEBOSH) is a degree-level (RQF Level 6, 42-credit) qualification for those pursuing a senior career in occupational health and safety. Launched in its current form in July 2023, it is the international counterpart to the National Diploma, using an ILO-based legal framework (ILO conventions and ILO-OSH 2001) rather than UK statute. It comprises three units: DI1 (workplace health and safety principles, assessed by a practical assignment), DI2 (controlling workplace health issues) and DI3 (controlling workplace safety issues), each DI2/DI3 assessed by a scenario-based case study. Learners must pass all three units.

Exam sponsor: NEBOSH (National Examination Board in Occupational Safety and Health). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Question count not published by the exam provider

Time Limit

DI1 ~40 hours over 4 weeks; DI2 and DI3 ~20 hours each over 2 weeks (untimed open submission windows)

Passing Score

50% in each unit; overall grade Pass 150-195, Credit 196-225, Distinction 226+

Exam / Certification Fees

Typically GBP 2,200-4,000 in total, set by the NEBOSH Learning Partner

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

28%

Health and Safety Management Principles (DI1)

Socio-legal models and enforcement notices, ILO conventions C155/C161/C187, the five elements of ILO-OSH 2001 and ISO 45001, transformational leadership, safety-culture maturity (Bradley curve, Hudson model), the ABC behavioural model, risk perception, competence and high-reliability organisations

18%

Risk Management and Human Factors (DI1)

Hazard-identification techniques (HAZOP guide words, FMEA, fault and event trees, bow-tie), risk evaluation and reducing risk ALARP, the hierarchy of control, loss-causation models (Heinrich domino, Reason Swiss cheese, accident ratios), root-cause investigation, active vs reactive monitoring, auditing, permit-to-work and contractor/supply-chain management

16%

Occupational Health and Toxicology (DI2)

Occupational health services, the four routes of entry, dose-response and acute vs chronic effects, epidemiology (incidence/prevalence, cohort and case-control studies), occupational exposure limits (8-hour TWA and 15-minute STEL), local exhaust ventilation, asbestos diseases, biological agents, GHS classification and health surveillance vs biological monitoring

11%

Physical and Psychosocial Health Hazards (DI2)

Noise exposure action values (80/85 dB(A), 87 dB(A) limit), hand-arm vibration (EAV 2.5, ELV 5.0 m/s2) and whole-body vibration (EAV 0.5, ELV 1.15 m/s2), ionising and non-ionising radiation and the inverse-square law, manual handling (TILE), display-screen ergonomics, heat stress (WBGT), work-related stress (Management Standards) and workplace violence/lone working

13%

Fire, Explosion and Chemical Safety (DI3)

Fire triangle and tetrahedron, fire classes A-F, flash point and lower/upper explosive limits, hazardous-area zoning (Zones 0/1/2), the dust-explosion pentagon, means of escape and travel distance, automatic sprinklers and detection, and segregated storage of incompatible dangerous substances

14%

Mechanical, Electrical and Workplace Safety (DI3)

Machinery hazards and guarding (fixed, interlocked and two-hand controls), safe use of work equipment, thorough examination of lifting equipment (6/12 months), mobile plant, electrical effects of current and protection (RCDs, 110V CTE, lock-out/tag-out), confined-space entry and atmospheric testing, work at height, excavation support and workplace transport

Preparing for the NEBOSH IDip Exam

What You Need to Know

Passing score: 50% in each unit; overall grade Pass 150-195, Credit 196-225, Distinction 226+
Assessment: Question count not published by the exam provider
Time limit: DI1 ~40 hours over 4 weeks; DI2 and DI3 ~20 hours each over 2 weeks (untimed open submission windows)
Exam / certification fees: Typically GBP 2,200-4,000 in total, set by the NEBOSH Learning Partner Official sources

Using Our Practice Resources

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NEBOSH IDip: Suggested Study Strategy

1Learn the ILO framework precisely: Convention C155 (national OSH policy), C161 (occupational health services), C187 (promotional framework) and the five elements of ILO-OSH 2001 (policy, organising, planning and implementation, evaluation, action for improvement)

2Memorise the key numbers: noise action values 80/85 dB(A) with an 87 dB(A) limit, hand-arm vibration EAV 2.5 and ELV 5.0 m/s2, whole-body vibration EAV 0.5 and ELV 1.15 m/s2, and confined-space safe oxygen 19.5-23.5%

3Be able to apply the hierarchy of control and reducing risk ALARP to scenario questions, and distinguish elimination/substitution/engineering controls from administrative controls and PPE

4Practise loss-causation and risk techniques: Heinrich's domino, Reason's Swiss cheese (latent vs active failures), and the use of HAZOP guide words, FMEA, fault/event trees and bow-tie diagrams

5For DI3, know guarding types (fixed, interlocked, two-hand control), lifting-equipment thorough-examination intervals (6 months for person-lifting/accessories, 12 months otherwise), RCD function and 110V centre-tapped-to-earth site supplies

6Because DI2 and DI3 are open-book case studies, build a well-indexed reference of ILO instruments, OELs and control measures so you can write applied, scenario-specific answers rather than generic ones

Frequently Asked Questions

What is the NEBOSH International Diploma?

It is the NEBOSH Level 6 International Diploma for Occupational Health and Safety Management Professionals (IDipNEBOSH), a degree-level (RQF Level 6, 42-credit) qualification for senior OSH roles. It uses an ILO-based international legal framework rather than UK law and is the international counterpart of the National Diploma.

How is the International Diploma assessed?

It has three units: DI1 is a practical assignment on workplace health and safety principles, while DI2 (health issues) and DI3 (safety issues) are each assessed by an open-book, scenario-based case study. There is no traditional sit-down multiple-choice exam; assessments are submitted electronically within set windows.

What are the pass mark and grading?

Each unit is marked from a total of 650 marks (DI1 300, DI2 175, DI3 175) and needs at least 50% to pass. Once all units are passed, the combined mark sets the overall grade: Pass 150-195, Credit 196-225, and Distinction 226 or above.

What topics does the syllabus cover?

DI1 covers management principles, ILO conventions, ILO-OSH 2001/ISO 45001, safety culture, human factors and risk management. DI2 covers occupational health, toxicology, hazardous substances, noise, vibration, radiation and mental health. DI3 covers fire and explosion, work equipment, electricity, confined spaces, construction and transport.

Are there entry requirements?

There is no mandatory prerequisite, but NEBOSH strongly recommends holding the International General Certificate first and having English to an IELTS 7.0 standard, because the assessments require extensive technical writing and analysis at degree level.

How long and how much does it take?

NEBOSH estimates around 470 learning hours (about 185 taught, 144 self-study and 80 assessment), with most learners completing over 12-24 months. Fees are set by Learning Partners and typically total roughly GBP 2,200-4,000.

Is the diploma recognised internationally?

Yes. The IDipNEBOSH is widely recognised by employers worldwide and meets the academic requirement for Graduate membership (GradIOSH) of the Institution of Occupational Safety and Health, a route toward Chartered (CMIOSH) status.

Free Practice Questions for NEBOSH IDip

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