Free mock exam
Inspection & Testing — 18th Edition (BS 7671) Practice
Free topic-focused mock exam: 30 random questions from a pool of 139 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
- 139
Free, no sign-up. Retake as many times as you like — different questions each time.
Sample questions
01Which regulation in BS 7671 sets the general requirement for initial verification?
- ARegulation 314.1
- BRegulation 641.1
- CRegulation 521.8
- DRegulation 411.3.3
Why: Regulation 641.1 requires every installation to be inspected and tested during erection and on completion, before being put into service, to verify so far as is reasonably practicable that BS 7671 has been met. Regulation 643.1 is the general clause for the testing part of initial verification.
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, it is free with 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 as a qualification?
No. This is independent practice material and does not award a qualification, card or certificate. Where a subject has a formal qualification or card, you gain it through an approved provider.