Free mock exam
Detectors & Devices — Fire Alarm Systems (BS 5839-1) Practice
Free topic-focused mock exam: all 25 questions on Detectors & Devices, drawn from the wider Fire Alarm Systems (BS 5839-1) bank. 35-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
- 25
- Time limit
- 35 min
- Pass mark
- 70% · 18/25
- Question bank
- 25
Free, no sign-up. Retake as many times as you like — the questions are reshuffled, with the answer order changed.
Sample questions
01What is the maximum coverage area for a single optical smoke detector in a normal risk area?
- A100m²
- B60m²
- C120m²
- D84m²
Why: In normal risk areas, a single optical smoke detector can cover a maximum of 84m².
02Which type of detector is most suitable for detecting smouldering fires?
- AHeat detector
- BFlame detector
- CIonisation smoke detector
- DOptical smoke detector
Why: Optical smoke detectors are most effective at detecting smouldering fires that produce visible smoke particles.
03At what height should manual call points normally be mounted?
- A1.6m
- B1.2m
- C1.4m
- D1.0m
Why: Manual call points should be mounted at 1.4m ±0.1m above floor level.
Common questions
Is the Detectors & Devices 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.
