Free Practice Questions for HK Confined Space Certified Worker

Exam-style questions and explanations by OpenExamPrep.

✓ No registration✓ No credit card

100+ Questions

100% Free

Loading practice questions...

Same family resources

Explore More Hong Kong Mandatory Construction Safety Training

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

Sample HK Confined Space Certified Worker Practice Questions

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

1Under the Factories and Industrial Undertakings (Confined Spaces) Regulation, a confined space is primarily defined as any place which, by virtue of its enclosed nature, has which feature?

A.A reasonably foreseeable specified risk arising from that enclosed nature

B.Continuous occupancy designed into the space by the manufacturer

C.An unlimited number of large exit openings at ground level

D.Natural outdoor ventilation that never needs mechanical assistance

Explanation: Cap. 59AE defines a confined space as a place that, by virtue of its enclosed nature, gives rise to a reasonably foreseeable specified risk. The Regulation then lists examples such as chambers, tanks, pits, sewers, tunnels, boilers, caissons, shafts and silos where such risk arises. Continuous occupancy design and free outdoor ventilation are the opposite of typical confined-space characteristics.

2Which of the following is listed in the Confined Spaces Regulation as an example of a place that may be a confined space when a specified risk arises?

A.An open public park lawn with unrestricted access

B.A sewer manhole or underground sewer chamber

C.A fully open rooftop terrace used only for drying clothes

D.A street-level pavement with free pedestrian flow

Explanation: The Regulation's illustrative list includes places such as chambers, tanks, pits, wells, sewers, tunnels, pipes, flues, boilers, pressure receivers, hatches, caissons, shafts and silos when a specified risk arises from their enclosed nature. A sewer manhole is a classic Hong Kong confined-space example. Open parks, rooftops and pavements lack that enclosed nature.

3Why are tanks, boilers and pressure receivers commonly treated as potential confined spaces?

A.They always contain only clean outdoor air at 21% oxygen

B.Their enclosed nature can create oxygen deficiency, toxic atmospheres or other specified risks

C.They are designed for continuous long-term human occupancy

D.They have multiple unrestricted ground-level doors like an office lobby

Explanation: Enclosed vessels such as tanks, boilers and pressure receivers can trap or generate hazardous atmospheres, limit escape, and present other specified risks. That enclosed nature is why Cap. 59AE expressly lists them among places that may be confined spaces. They are not designed for continuous occupancy and do not behave like open offices.

4A construction worker must enter a deep excavation shaft with limited means of entry and exit where a hazardous atmosphere is reasonably foreseeable. How should this place be treated under Hong Kong confined-space rules?

A.As an ordinary open trench that never needs certified workers

B.As a potential confined space requiring the controls in the Confined Spaces Regulation

C.As a space where only a Green Card is ever required and no further training applies

D.As a public highway works area exempt from Cap. 59AE entirely

Explanation: Shafts are expressly contemplated in Cap. 59AE's examples, and any enclosed place with a reasonably foreseeable specified risk is a confined space. Entry then requires certified workers, competent-person risk assessment, permit controls and other Regulation/CoP precautions—not treatment as an ordinary open trench.

5Which statement best describes a key characteristic that makes a workplace a confined space concern?

A.Workers can walk in and out freely through many wide doorways at all times

B.Entry and exit are limited or restricted and a hazardous atmosphere or other specified risk is reasonably foreseeable

C.The space is always larger than a football pitch and fully naturally ventilated

D.The space has been certified by the manufacturer as safe for living accommodation

Explanation: Confined-space danger comes from enclosed configuration with limited egress plus a reasonably foreseeable specified risk (for example atmospheric, engulfment or other hazards). Wide free access, stadium-scale open ventilation, or living-accommodation design are not the typical confined-space profile.

6Which Hong Kong workplace example is MOST likely to be a confined space under Cap. 59AE?

A.A well-ventilated open steel fabrication yard at ground level

B.An underground caisson or cofferdam chamber during construction

C.An outdoor car park with no roof or walls

D.A street-front retail shop with large open doors

Explanation: Caissons and similar enclosed underground chambers are listed/illustrative confined-space situations when specified risks arise. Open yards, open car parks and ordinary shops with free access are not enclosed places of that type.

7A silo used to store bulk materials can become a confined space because workers inside may face which combination of risks?

A.Only mild daylight glare with no atmospheric or engulfment concern

B.Engulfment by flowing material and a hazardous atmosphere in an enclosed vessel

C.Unlimited escape routes equal to those in an open field

D.Guaranteed continuous fresh-air exchange equal to outdoor conditions

Explanation: Silos are enclosed vessels listed among Cap. 59AE examples. Workers can be engulfed by flowing solids and can face oxygen deficiency or toxic/dust atmospheres. Escape is restricted, and outdoor-equivalent ventilation cannot be assumed.

8Which statement about "specified risk" in the confined-space definition is correct?

A.A space is a confined space only if a fatality has already occurred there

B.The risk must be reasonably foreseeable because of the place's enclosed nature

C.Specified risk means only the risk of slipping on a wet office floor

D.Specified risk applies only to outdoor sports fields

Explanation: The Regulation ties confined-space status to a reasonably foreseeable specified risk arising by virtue of the enclosed nature of the place. Prior fatalities are not required, and ordinary office slip risks or outdoor sports fields are not the statutory concept.

9Compared with an open outdoor worksite, a confined space typically increases danger because:

A.Hazardous gases disperse more easily and escape is always faster

B.Hazardous atmospheres can accumulate, escape is restricted, and rescue is more difficult

C.Workers always have more natural light and more exit options

D.Atmospheric testing is never useful or required

Explanation: Enclosure allows oxygen deficiency, flammable mixtures and toxics to build up; limited openings slow escape; and rescue is harder—exactly why Cap. 59AE and the Labour Department CoP impose special controls. Dispersion is worse, not better, and atmospheric testing is a core precaution.

10A pipe, flue or tunnel may be a confined space even if workers enter only briefly, because:

A.Brief entry automatically cancels all Cap. 59AE duties

B.The enclosed configuration and foreseeable specified risk still apply regardless of short duration

C.Only stays longer than eight hours create confined-space risk

D.Any space entered for less than five minutes is legally an open workplace

Explanation: Classification turns on enclosed nature and reasonably foreseeable specified risk, not on whether the planned stay is long. Short entries into sewers, pipes, flues or tunnels have caused serious incidents; Cap. 59AE controls still apply.

About the HK Confined Space Certified Worker Exam

The Safety Training Course for Certified Workers of Confined Spaces Operation is the Labour Department-recognised mandatory safety training that qualifies a person aged 18 or above to enter and work in a confined space as a certified worker under Cap. 59AE. The common syllabus covers the nature of confined spaces, legal duties, atmospheric and physical hazards, gas monitoring, permit-to-work and safe procedures, PPE and breathing apparatus, emergency rescue, and the certified worker's own duties. The Labour Department's Code of Practice for Safety and Health at Work in Confined Spaces provides the practical guidance assessed in training.

Exam sponsor: Commissioner for Labour (course recognition); certificates issued by Labour Department-recognised training providers. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Labour Department-recognised Safety Training Course for Certified Workers of Confined Spaces Operation under the Factories and Industrial Undertakings (Confined Spaces) Regulation. Assessment is set by each approved provider and typically combines a written knowledge test with practical checks on PPE, breathing apparatus and rescue equipment. 100% attendance is commonly required before a certificate is issued.

Time Limit

Initial course length is set by the approved provider under LD course-approval rules. Many centres historically ran about an 8-hour day course; after LD refined mandatory confined-space training (extended duration), some providers advertise programmes around 12 hours of theory/hands-on plus a separate practical examination. Confirm exact timetable and written-exam duration with your provider.

Passing Score

Pass criteria are set by the approved provider. Typical requirements are 100% attendance plus a pass in the written assessment and, where required, the practical examination. Some centres publish an indicative score such as about 75% of total marks. Confirm the exact pass mark for your sitting.

Exam / Certification Fees

Fees are set by each Labour Department-recognised provider and change periodically. Published examples from recognised centres have ranged roughly from about HK$400 to about HK$980+ for the certified-worker course. Confirm the current fee when you enrol.

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.

10%

Nature & Types of Confined Spaces

Legal definition, enclosed nature, specified risk, and common confined-space examples.

12%

Legislative Requirements

F&IU Confined Spaces Regulation, CoP, and duties of proprietors, competent persons and workers.

15%

Hazards Identification & Accident Prevention

Atmospheric, chemical and physical hazards and how accidents are prevented.

15%

Atmospheric Testing & Gas Monitoring

Test order, O₂/LEL/toxics, continuous monitoring and meter use.

12%

Permit-to-Work & Safe Work Procedures

Risk assessment, isolation, PTW certificate, standby person and entry controls.

14%

PPE, Breathing Apparatus & Safety Equipment

Approved BA, escape sets, PPE, life lines and related safety equipment.

12%

Emergency Procedures & Rescue

Emergency plans, standby response, rescue equipment and non-entry rescue principles.

10%

Duties of the Certified Worker

Certification rules, following procedures, equipment care and role boundaries.

Preparing for the HK Confined Space Certified Worker Exam

What You Need to Know

Passing score: Pass criteria are set by the approved provider. Typical requirements are 100% attendance plus a pass in the written assessment and, where required, the practical examination. Some centres publish an indicative score such as about 75% of total marks. Confirm the exact pass mark for your sitting.
Assessment: Labour Department-recognised Safety Training Course for Certified Workers of Confined Spaces Operation under the Factories and Industrial Undertakings (Confined Spaces) Regulation. Assessment is set by each approved provider and typically combines a written knowledge test with practical checks on PPE, breathing apparatus and rescue equipment. 100% attendance is commonly required before a certificate is issued.
Time limit: Initial course length is set by the approved provider under LD course-approval rules. Many centres historically ran about an 8-hour day course; after LD refined mandatory confined-space training (extended duration), some providers advertise programmes around 12 hours of theory/hands-on plus a separate practical examination. Confirm exact timetable and written-exam duration with your provider.
Exam / certification fees: Fees are set by each Labour Department-recognised provider and change periodically. Published examples from recognised centres have ranged roughly from about HK$400 to about HK$980+ for the certified-worker course. Confirm the current fee when you enrol. Official sources

Using Our Practice Resources

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

HK Confined Space Certified Worker: Suggested Study Strategy

1Memorise the Hong Kong CoP oxygen band (19.5%–22% by volume) and the reason oxygen is tested before combustible gases — both appear frequently in certified-worker assessments.

2Know the role split: the competent person prepares the risk assessment; the proprietor/contractor issues the Permit-to-work Certificate after precautions are in place; the certified worker enters only under a valid permit with a standby person outside.

3Drill emergency behaviour: never rush in without approved breathing apparatus and training; the standby person maintains communication, raises the alarm and supports rescue from outside where practicable.

Frequently Asked Questions

Who can enter a confined space as a certified worker in Hong Kong?

Under the Factories and Industrial Undertakings (Confined Spaces) Regulation, only certified workers may enter or work in a confined space. A certified worker must be at least 18 years old and hold a valid certificate issued by a training provider authorised by the Commissioner for Labour after successfully completing an approved Safety Training Course for Certified Workers of Confined Spaces Operation.

How is the Certified Worker course assessed?

Assessment is set by each Labour Department-recognised provider. Typical requirements are 100% attendance plus a pass in a written knowledge test and, on many current courses, a practical examination covering PPE, breathing apparatus and rescue equipment. Exact question counts, timing and pass marks are not published as a single Labour Department figure — confirm with your training centre.

What oxygen levels does the Hong Kong Code of Practice require before entry?

The Labour Department Code of Practice for Safety and Health at Work in Confined Spaces states that the percentage of oxygen in air in a confined space should not be less than 19.5% by volume nor greater than 22% by volume at normal atmospheric pressure. Oxygen is generally tested first because many combustible-gas meters need adequate oxygen to give reliable readings.

How long is the Certified Worker certificate valid?

Validity is set under Labour Department-approved course rules. After LD refined mandatory confined-space training (updated content, longer courses, shorter certificate validity), many recognised providers issue certificates valid for 2 years from completion. Some older provider pages still mentioned 3 years. Check the validity printed on your certificate and complete revalidation before expiry (or within the provider's allowed post-expiry window, often about 3 months).