Free mock exam
Fundamentals — Fibre Optics Practice
Free topic-focused mock exam: all 20 questions on Fundamentals, drawn from the wider Fibre Optics 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
- 20
- Time limit
- 35 min
- Pass mark
- 70% · 14/20
- Question bank
- 20
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 phenomenon that allows light to travel through an optical fibre?
- ARayleigh scattering within the core
- BTotal internal reflection
- CDiffraction around the cladding boundary
- DRefraction into the cladding layer
Why: Total internal reflection occurs when light hits the core/cladding boundary at an angle greater than the critical angle, causing it to reflect back into the core rather than escaping.
02What is the typical core diameter of singlemode fibre?
- A62.5 micrometres
- B125 micrometres
- C50 micrometres
- D8-9 micrometres
Why: Singlemode fibre has a small core diameter of 8-9 micrometres (typically 9µm for OS2), which allows only one mode of light to propagate. The 125µm dimension refers to the cladding diameter.
03Which fibre type is best suited for long-distance telecommunications applications?
- AOM4 multimode
- BOS2 singlemode
- COM1 multimode
- DOM3 multimode
Why: OS2 singlemode fibre has the lowest attenuation (0.35 dB/km at 1310nm, 0.22 dB/km at 1550nm) and no modal dispersion, making it ideal for long-distance transmission.
Common questions
Is the Fundamentals 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.
