Free mock exam
Fibre Types — Fibre Optics Practice
Free topic-focused mock exam: all 30 questions on Fibre Types, 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
- 30
- Time limit
- 35 min
- Pass mark
- 70% · 21/30
- Question bank
- 30
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 modal bandwidth rating of OM4 multimode fibre at 850nm?
- A500 MHz·km
- B4700 MHz·km
- C2000 MHz·km
- D200 MHz·km
Why: OM4 fibre has an effective modal bandwidth of 4700 MHz·km at 850nm with laser sources, enabling longer reach for high-speed applications compared to OM3 (2000 MHz·km).
02What does 'G.657' refer to in singlemode fibre specifications?
- AConnector specifications
- BBend-insensitive fibre standards
- CTesting requirements
- DMaximum attenuation coefficient
Why: ITU-T G.657 defines bend-insensitive singlemode fibre specifications, with variants A1, A2, B2, and B3 specifying increasingly tight bend radius tolerance.
03What distinguishes OM5 fibre from OM4?
- AIt has lower attenuation than OS2 at 1550nm
- BIt uses a 62.5µm core instead of a 50µm core
- COptimised for SWDM (multiple wavelengths 850-953nm)
- DIt is a singlemode fibre with a 9µm core
Why: OM5 (wideband multimode) is optimised for shortwave wavelength division multiplexing (SWDM) across 850-953nm, enabling higher capacity over duplex connections.
Common questions
Is the Fibre Types 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.
