100+ Free UK ADR Class 7 Radioactive Practice Questions

Pass your UK ADR Dangerous Goods Driver Class 7 Radioactive Exam (Qualifications Scotland / DfT) exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: UK ADR Class 7 Radioactive Exam

15 MCQs

Official SQA Class 7 Radioactive specialisation paper length

Qualifications Scotland / DfT ADR exam specifications

10/15

Passing score (70%) required on the Class 7 CBT paper

Qualifications Scotland DGDT

50 TI

Maximum total sum of Transport Indexes on non-exclusive use vehicle

ADR 7.5.11 CV33

4 Bq/cm²

Maximum non-fixed surface contamination limit for beta/gamma emitters

ADR 4.1.9.1.2

20 mSv/yr

Statutory annual occupational dose limit for adult workers

UK Ionising Radiations Regulations 2017 (IRR17)

100

Free OpenExamPrep practice questions for UK ADR Class 7

OpenExamPrep

UK ADR Class 7 Radioactive is a 15-question SQA CBT (pass 10/15, 30 mins) required for drivers transporting radioactive isotopes in Great Britain and Europe. It covers radiation protection, package categories (Excepted, Type A, Type B, Type C), TI/CSI rules, Exclusive Use, and ONR emergency response. This free bank has 100 practice questions mapped to DfT syllabus.

Sample UK ADR Class 7 Radioactive Practice Questions

Try these sample questions to test your UK ADR Class 7 Radioactive exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the physical definition of a Class 7 radioactive material under ADR Chapter 2.2.7?

A.Any material containing radionuclides where both the activity concentration and the total activity in the consignment exceed ADR threshold values

B.Any chemical substance that causes severe skin burns within 3 minutes of contact

C.Any flammable liquid with a flashpoint below 0 °C

D.Any gas pressurized to over 200 bar

Explanation: ADR 2.2.7.1.1 defines Class 7 radioactive material as any material containing radionuclides where both the activity concentration and the total activity in the consignment exceed specified threshold values.

2Which type of ionizing radiation consists of heavy positively-charged helium nuclei with high ionizing power but low penetrating power easily stopped by a sheet of paper?

A.Beta particles (β)

B.Alpha particles (α)

C.Gamma rays (γ)

D.Neutron radiation

Explanation: Alpha particles are helium nuclei (+2 charge) with high mass. They have high linear energy transfer (ionizing power) but very low penetration, stopped by a single sheet of paper or the dead outer layer of human skin.

3What type of shielding is most effective for stopping high-energy Beta (β) radiation while minimizing bremsstrahlung (x-ray emission)?

A.Dense lead blocks only

B.Depleted uranium plates

C.Low atomic number (low-Z) materials such as perspex, acrylic, or aluminum

D.Steel chainmail mesh

Explanation: Beta particles (electrons) decelerating rapidly in heavy metals like lead create secondary X-rays called bremsstrahlung. Low-Z materials (perspex, plastic, aluminum) absorb beta particles without generating significant secondary X-rays.

4What type of shielding material is required to attenuate Gamma (γ) radiation effectively?

A.Single layer of cotton fabric

B.Clear plastic wrap

C.Paper cardboard sheets

D.High-density materials such as lead, depleted uranium, steel, or heavy concrete

Explanation: Gamma rays are highly penetrating electromagnetic radiation. Attenuation depends on electron density; high-Z dense materials like lead, steel, and heavy concrete are necessary.

5What are the three fundamental cardinal principles of radiation protection used to minimize external dose to transport workers?

A.Time, Distance, and Shielding

B.Speed, Temperature, and Pressure

C.Volume, Mass, and Density

D.Voltage, Current, and Resistance

Explanation: The three core principles of radiation protection are: Time (minimize exposure time), Distance (maximize distance from source), and Shielding (use appropriate shielding materials).

6According to the Inverse Square Law for point-source radiation, if a driver doubles their distance from a radioactive package (e.g. moving from 1 metre to 2 metres), what happens to the radiation dose rate?

A.The dose rate drops by one-half (50%)

B.The dose rate drops to one-quarter (1/4 or 25%) of its original value

C.The dose rate remains exactly the same

D.The dose rate doubles

Explanation: The Inverse Square Law states that radiation intensity is inversely proportional to the square of the distance (I = 1/d^2). Doubling distance (2x) reduces dose rate to 1/(2^2) = 1/4 (25%).

7What is the SI unit used to measure radioactive decay activity (disintegrations per second)?

A.Sievert (Sv)

B.Gray (Gy)

C.Becquerel (Bq)

D.Watt (W)

Explanation: The Becquerel (Bq) is the SI unit of activity, defined as one nuclear disintegration per second (1 Bq = 1 dps). Larger multiples include MBq (10^6 Bq) and GBq (10^9 Bq).

8What SI unit is used to express equivalent radiation dose and effective dose received by human tissue?

A.Becquerel (Bq)

B.Pascal (Pa)

C.Kilogram (kg)

D.Sievert (Sv) or millisievert (mSv)

Explanation: The Sievert (Sv) and its subunit millisievert (mSv, 1/1,000 Sv) or microsievert (μSv, 1/1,000,000 Sv) measure the biological risk / effective dose of radiation to human tissue.

9Under UK Ionising Radiations Regulations 2017 (IRR17) and ADR rules, what is the annual effective dose limit for an adult transport worker exposed to ionising radiation in the course of their work?

A.20 mSv per calendar year

B.1 mSv per calendar year

C.500 mSv per calendar year

D.100 mSv per calendar year

Explanation: Under UK IRR17 regulations, the statutory annual dose limit for classified radiation workers is 20 mSv per year (with lower constraints for non-classified staff and members of the public at 1 mSv/yr).

10What does the ALARP / ALARA principle stand for in radiation safety?

A.Always Lock All Radioactive Packages

B.As Low As Reasonably Practicable / Achievable

C.Automatic Level Adjustment for Radiation Protection

D.Approved Licence for All Radioactive Procedures

Explanation: ALARP (As Low As Reasonably Practicable) or ALARA (As Low As Reasonably Achievable) requires that radiation exposures must be minimized taking into account economic and social factors.

About the UK ADR Class 7 Radioactive Exam

The UK ADR Class 7 Radioactive examination is a touchscreen multiple-choice CBT for commercial drivers transporting Class 7 radioactive materials (including industrial radiographers, medical isotope couriers, and nuclear transport operators). Administered by Qualifications Scotland for the UK Department for Transport (DfT) and regulated by the Office for Nuclear Regulation (ONR), it tests radiation physics (alpha, beta, gamma, shielding, ALARP, IRR17 dose limits), package categories (Excepted, Type A, Type B(U), Type B(M), Type C, LSA, SCO), Transport Index (TI) calculation, Criticality Safety Index (CSI) for fissile loads, vehicle placarding (Model 7D), non-fixed surface contamination limits (4 Bq/cm²), and emergency spill/ONR reporting protocols.

Questions

15 scored questions

Time Limit

30 minutes (centre-scheduled touchscreen CBT)

Passing Score

10 out of 15 correct (about 70%)

Exam Fee

Typically £20–£30 SQA/Qualifications Scotland exam fee per paper (course tuition for Class 7 commonly £400–£600) (Qualifications Scotland / SQA DGDT on behalf of the Department for Transport)

UK ADR Class 7 Radioactive Exam Content Outline

20%

Radiation Physics, Units & Biological Protection

Alpha, beta, gamma radiation characteristics, inverse square law, shielding materials, Bq/Sv units, IRR17 dose limits (20 mSv/yr), dosimetry/monitoring, and ALARP principles.

30%

Class 7 Package Categories & Specifications

Excepted, Type A, Type B(U), Type B(M), Type C, LSA/SCO, A1/A2 activity limits, special form materials, and hazard labels (I-WHITE, II-YELLOW, III-YELLOW).

25%

Transport Index (TI), CSI & Placarding

TI calculation at 1m, Criticality Safety Index (CSI) for fissile material, load limits (max sum TI 50), Exclusive Use rules, and Model 7D vehicle placarding.

25%

Decontamination, Monitoring & ONR Incident Response

Non-fixed contamination limits (4 Bq/cm²), spill isolation, RPA/RPO roles, and statutory ONR incident reporting.

How to Pass the UK ADR Class 7 Radioactive Exam

What You Need to Know

Passing score: 10 out of 15 correct (about 70%)
Exam length: 15 questions
Time limit: 30 minutes (centre-scheduled touchscreen CBT)
Exam fee: Typically £20–£30 SQA/Qualifications Scotland exam fee per paper (course tuition for Class 7 commonly £400–£600)

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 ADR Class 7 Radioactive Study Tips from Top Performers

1Master the 3 radiation protection rules: Time (minimize), Distance (maximize - Inverse Square Law), Shielding (lead/concrete for gamma, plastic/aluminum for beta).

2Learn the 3 label categories: Category I-WHITE (TI=0, surface <= 5 μSv/h), Category II-YELLOW (TI<=1, surface <= 500 μSv/h), Category III-YELLOW (TI<=10, surface <= 2 mSv/h).

3Memorise TI formula: Dose rate at 1m (in μSv/h) / 10. Maximum vehicle TI sum is 50 for non-exclusive use.

4Understand package types: Excepted (tiny activity, UN 2910), Type A (normal transport tests), Type B (accident tested), Type C (high-speed air crash tested).

5Know contamination limits: 4 Bq/cm² for beta/gamma/low-toxicity alpha, 0.4 Bq/cm² for high-toxicity alpha emitters.

Frequently Asked Questions

What is the UK ADR Class 7 Radioactive exam?

It is the specialisation CBT paper for drivers carrying Class 7 radioactive substances or packages (industrial sources, medical isotopes, nuclear fuels) on road vehicles in Great Britain and under ADR.

How many questions are on the Class 7 paper?

The official SQA paper consists of 15 multiple-choice questions. The pass mark is 10 out of 15 (70%) within a 30-minute time limit.

What is the Transport Index (TI)?

The Transport Index (TI) is a single number assigned to a package representing the maximum radiation dose rate in μSv/h at 1 metre from its surface divided by 10. It controls package accumulation on vehicles.

What is the difference between Type A and Type B packages?

Type A packages carry lower activities and must withstand normal transport handling (drop, rain, stacking). Type B packages carry high activities and must withstand severe accident conditions (9m drop, 800 °C fire, water immersion).

Who enforces Class 7 transport safety in Great Britain?

The Office for Nuclear Regulation (ONR) is the competent authority enforcing Class 7 transport safety by road and rail in Great Britain.