Free mock exam
Inspection & Testing — 18th Edition (BS 7671) Practice
Free topic-focused mock exam: 30 random questions from a pool of 131 on Inspection & Testing, drawn from the wider 18th Edition (BS 7671) bank. 60-minute timer, 70% to pass, worked explanation on every question. Use this when you've taken the full mock once and want to drill the topics you got wrong.
- Questions
- 30
- Time limit
- 60 min
- Pass mark
- 70% · 21/30
- Question bank
- 131
Free, no sign-up. Retake as many times as you like — different questions each time.
Sample questions
01Which regulation in BS 7671 covers initial verification?
- ARegulation 314.1
- BRegulation 643.1
- CRegulation 521.8
- DRegulation 411.3.3
Why: Regulation 643.1 specifically covers the requirements for initial verification of electrical installations.
02What is the minimum acceptable insulation resistance value for a 230V circuit?
- A5 MΩ
- B1 MΩ
- C0.5 MΩ
- D2 MΩ
Why: BS 7671 requires a minimum insulation resistance of 1 MΩ for circuits up to 500V.
03According to BS 7671, what is the maximum earth fault loop impedance (Zs) for a 32A Type B MCB?
- A1.37Ω
- B1.10Ω
- C2.19Ω
- D1.44Ω
Why: Table 41.3 gives a maximum Zs of 1.37Ω for a 32A Type B MCB at 230V (includes the Cmin factor of 0.95). 1.44Ω is the old pre-Cmin figure; 1.10Ω is the cold-measured site limit after applying the 0.80 rule-of-thumb factor.
Common questions
Is the Inspection & Testing mock exam free?
Yes — 100% free, no sign-up needed. Questions are pulled at random from a substantial bank, with a worked explanation on every question after you submit.
Can I retake the mock exam?
Yes. Every attempt picks a different random selection and reshuffles the options, so each retake gives you genuinely new questions. No limit on retakes.
Does this count towards the real qualification?
No — this is independent practice material. To gain the actual qualification you need to sit the official assessment through an approved provider.
