100+ Free UK Medium Risk Confined Space Practice Questions

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2026 Statistics

Key Facts: UK Medium Risk Confined Space Exam

20 Qs

Theory Test Questions

City & Guilds 6160-02

80%

Theory Pass Mark

City & Guilds 6160-02

3 Years

Certification Validity

HSE L101 Guidance

City & Guilds 6160-02 / Qualsafe Medium Risk Confined Space qualification certifies competence under UK Confined Spaces Regulations 1997 and HSE L101 ACOP. This is an English-language MCQ study adaptation for the official assessment; it does not replace required practical, oral, written, or hands-on performance.

Sample UK Medium Risk Confined Space Practice Questions

Try these sample questions to test your UK Medium Risk Confined Space exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under Regulation 1(2) of the UK Confined Spaces Regulations 1997, what two key criteria must BOTH be met for a location to be legally defined as a confined space?

A.The space must be completely airtight and lack electric lighting.

B.The space must be substantially enclosed and contain a reasonably foreseeable specified risk.

C.The space must be located underground and require rope access equipment.

D.The space must have only one narrow access hatch and contain toxic gas.

Explanation: Under the Confined Spaces Regulations 1997, a confined space is defined by two fundamental conditions: it must be substantially (though not necessarily entirely) enclosed, and there must be a reasonably foreseeable specified risk of serious injury or death. Without a specified risk, an enclosed space does not meet the legal definition of a confined space.

2Which of the following is explicitly listed as a 'specified risk' under the UK Confined Spaces Regulations 1997?

A.Hearing impairment from ambient industrial machinery noise

B.Minor superficial skin irritation from contact with dirty water

C.Serious injury arising from fire or explosion

D.Tripping over loose cabling on a level walkway

Explanation: The Confined Spaces Regulations 1997 define five specific hazards as specified risks: fire/explosion, loss of consciousness from body temperature increase, loss of consciousness/asphyxiation from gas/fume/vapor/O2 lack, drowning from liquid increase, and asphyxiation/entrapment from free-flowing solids.

3What is the key operational distinction between a 'Low Risk' and a 'Medium Risk' confined space under City & Guilds 6160 framework guidance?

A.Low risk spaces do not require risk assessments, permits to work, or safety equipment of any kind.

B.Medium risk spaces can only be entered by emergency response rescue services.

C.Medium risk spaces require full self-contained breathing apparatus (SCBA) worn continuously during routine work.

D.Medium risk spaces involve specified risks where entry requires emergency escape breathing apparatus (EEBA) and trained top person supervision, but routine work does not require airline/SCBA.

Explanation: Medium risk confined spaces (City & Guilds 6160-02) have present or foreseeable specified risks where work can be done safely without routine working breathing apparatus, but entrants must carry Emergency Escape Breathing Apparatus (EEBA) for emergency escape, supported by a competent top person.

4According to the HSE Approved Code of Practice (ACOP L101), what is the first priority in the hierarchy of control measures for confined spaces?

A.Avoid entry into the confined space altogether by doing the work from outside.

B.Continuously ventilate the space with forced fresh air for 30 minutes prior to entry.

C.Perform multi-gas atmospheric testing using a calibrated portable detector.

D.Issue all entrants with 15-minute emergency escape breathing apparatus.

Explanation: Regulation 4(1) of the Confined Spaces Regulations 1997 mandates that no person shall enter a confined space for any purpose if it is reasonably practicable to carry out the work without entering. Avoiding entry completely (e.g., using remote cameras, long-handled tools, or external cleaning flushes) is the top priority.

5What normal volume percentage of oxygen ($O_2$) is present in clean, unpolluted ambient air at sea level?

A.16.5%

B.19.5%

C.20.9%

D.25.0%

Explanation: Normal ambient fresh air contains approximately 20.9% oxygen by volume (along with roughly 78% nitrogen and 1% trace gases). Atmospheric gas detectors are calibrated to baseline fresh air at 20.9% O2.

6At what lower threshold level of oxygen concentration is an atmosphere legally considered oxygen-deficient, triggering gas detector alarms?

A.Below 10.0%

B.Below 20.9%

C.Below 19.5%

D.Below 15.0%

Explanation: In accordance with UK HSE guidelines and standard gas detector configurations, an oxygen level falling below 19.5% (or 19.0% depending on specific device preset) indicates oxygen depletion and requires immediate evacuation.

7Why is an oxygen-enriched atmosphere (above 23.0% $O_2$) extremely hazardous in a confined space?

A.It leads to instant frostbite on exposed skin due to rapid cooling.

B.It inactivates electronic gas detector catalytic sensors instantly.

C.It causes immediate carbon monoxide poisoning in entrants.

D.It significantly increases the flammability and burn rate of materials, making fires explode rapidly.

Explanation: Oxygen enrichment (above 23.0% O2) drastically increases the risk of fire and explosion. Materials that do not normally burn readily in air can ignite spontaneously or burn with extreme speed and intensity in oxygen-enriched atmospheres.

8Which toxic gas commonly found in sewers and manholes smells of rotten eggs at low concentrations but deadens the sense of smell at higher concentrations?

A.Hydrogen Sulfide ($H_2S$)

B.Methane ($CH_4$)

C.Nitrogen ($N_2$)

D.Carbon Monoxide ($CO$)

Explanation: Hydrogen Sulfide (H2S) has a characteristic rotten egg odor at very low concentrations (below 1 ppm). However, at concentrations above 20-50 ppm, it rapidly causes olfactory fatigue (paralyzing the sense of smell), making smell an entirely unreliable indicator of its presence.

9What is the primary physiological mechanism by which Carbon Monoxide ($CO$) causes poisoning in the human body?

A.It dissolves lung tissue upon contact forming concentrated sulfuric acid.

B.It binds to hemoglobin in red blood cells with ~200 times higher affinity than oxygen, preventing oxygen transport.

C.It ignites inside the lungs upon contact with warm moist air.

D.It neutralizes electrical nerve impulses to the heart muscle instantly.

Explanation: Carbon monoxide (CO) binds to hemoglobin to form carboxyhemoglobin (COHb). Because hemoglobin's affinity for CO is approximately 200 to 250 times greater than for oxygen, CO displaces oxygen in the blood, causing tissue hypoxia and asphyxiation.

10What term defines the minimum concentration of a flammable gas or vapor in air required to support combustion when an ignition source is present?

A.Short-Term Exposure Limit (STEL)

B.Upper Explosive Limit (UEL)

C.Lower Explosive Limit (LEL)

D.Workplace Exposure Limit (WEL)

Explanation: The Lower Explosive Limit (LEL) is the minimum percentage concentration of a combustible gas or vapor in air below which the atmosphere is too 'lean' to burn or explode in the presence of an ignition source.

About the UK Medium Risk Confined Space Exam

The UK Level 2 Award in Working in Medium Risk Confined Spaces (City & Guilds 6160-02 / Qualsafe / CABWI) is designed for individuals working in confined spaces where hazards are present or specified risks exist, requiring safe access, gas monitoring, top person monitoring, and Emergency Escape Breathing Apparatus (EEBA). This is an English-language MCQ study adaptation for the official assessment; it does not replace required practical, oral, written, or hands-on performance.

Assessment

Closed-book theory MCQ test (20 questions) and practical assessment. Topics cover Hazard Identification, Gas Testing, Permits to Work, and Emergency EEBA Procedures. This is an English-language MCQ study adaptation for the official assessment; it does not replace required practical, oral, written, or hands-on performance.

Time Limit

30 minutes

Passing Score

80%

Exam Fee

£350 (City & Guilds / Qualsafe / CABWI (UK HSE L101))

UK Medium Risk Confined Space Exam Content Outline

25%

Hazard Identification & Risk Assessment

1997 Regulations legal framework, specified risks, atmospheric hazards (O2 depletion/enrichment, toxic gases, flammable vapors), physical hazards, and risk hierarchy.

25%

Atmospheric Monitoring & Gas Testing

Gas detector operation, bump testing, fresh air calibration, LEL/UEL, toxic gas exposure limits (H2S, CO), and continuous monitoring procedures.

25%

Safe Systems of Work & Permits to Work

Entrant and Top Person (Standby) duties, Safe Systems of Work (SSoW), Permit to Work (PTW) issuance and cancellation, isolation (LOTO), and forced ventilation.

25%

Emergency Procedures & Breathing Apparatus

Emergency planning, pre-entry checks and wearing of Emergency Escape Breathing Apparatus (EEBA 15-min sets), tripod/winch retrieval systems, and emergency notification.

How to Pass the UK Medium Risk Confined Space Exam

What You Need to Know

Passing score: 80%
Assessment: Closed-book theory MCQ test (20 questions) and practical assessment. Topics cover Hazard Identification, Gas Testing, Permits to Work, and Emergency EEBA Procedures. This is an English-language MCQ study adaptation for the official assessment; it does not replace required practical, oral, written, or hands-on performance.
Time limit: 30 minutes
Exam fee: £350

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

UK Medium Risk Confined Space Study Tips from Top Performers

1Memorize normal atmospheric oxygen concentration (20.9%) and alarm thresholds (below 19.5% depletion, above 23.0% enrichment).

2Understand the key responsibilities of the Top Person (Standby), including maintaining continuous communication, monitoring gas levels, and never entering the space during an emergency.

3Review the operation and pre-use checks of 15-minute Emergency Escape Breathing Apparatus (EEBA) sets, tripods, fall arrest winches, and safety harnesses.

Frequently Asked Questions

What defines a medium risk confined space under City & Guilds 6160-02?

A medium risk confined space involves realistic risk of atmospheric hazards or specified risks where entry requires vertical/horizontal access, top person supervision, gas testing, and escape breathing apparatus (EEBA) available for emergency escape, but not full working breathing apparatus.

What is the requirement for emergency breathing apparatus in medium risk entry?

Entrants in medium risk confined spaces must carry or have immediate access to certified Emergency Escape Breathing Apparatus (EEBA, typically 10-15 minute duration) to allow safe evacuation if the atmosphere deteriorates.

How long is the qualification valid?

Qualifications under City & Guilds 6160 and Qualsafe are typically valid for 3 years, after which refresher training and re-assessment are required to maintain industry competence.