What is the mass number of an element?
- A Number of electrons and protons.
- B Number of neutrons and protons.
- C Number of protons and electrons.
Sign in to your PART66Online account
One click — no password needed
Don't have an account? Register here
Module 2 covers the physics every aircraft maintenance engineer needs on the line: matter, mechanics, fluid behaviour, thermodynamics, optics and waves. Below: what's covered, exam format for each licence category, and seven free sample questions in the style you'll meet on exam day.
Atomic number counts protons only; mass number counts protons plus neutrons. Candidates routinely swap them or add electrons into the mix, which is never correct.
Fusion is the latent heat for solid ↔ liquid; vaporisation is liquid ↔ gas. Both happen at constant temperature, so candidates pick the wrong one when the temperature stays put.
Period (seconds) and frequency (hertz) are reciprocals: T = 1/f. Under time pressure candidates plug f straight in or forget to invert, and the answer goes off by a factor of f².
Module 2 of the EASA Part-66 syllabus tests the physical principles that underpin nearly every other module in the licence: how forces act on an airframe (Module 11), how fluids behave in hydraulics and pitot-static systems (Modules 7 and 11), how heat moves through engines and structures (Modules 14 to 17), and how light and sound work in cockpit displays and NDT. A candidate who is shaky on Module 2 typically struggles with the engine and aerodynamics papers too, which is why the syllabus places it so early.
The five sub-sections — Matter, Mechanics, Thermodynamics, Optics and Wave Motion & Sound — are weighted differently per licence category. Category A and B3 candidates sit a 32-question paper covering the topics at knowledge level 1 (basic familiarisation), with that same basic level applied to Matter for everyone. B1, B2 and B2L candidates sit a longer 52-question paper at knowledge level 2 across mechanics, thermodynamics, optics and waves — they need to apply the principles, not just recognise them.
Expect a mix of conceptual definitions (what is the atomic number? what is heat of fusion?) and short numerical problems on levers, pressure, density and wave period. The paper is sat without a calculator, so arithmetic from Module 1 still matters here. The full per-section knowledge-level breakdown is on our Module 2 syllabus page.
These samples are drawn from our live Module 2 question bank of 998 questions. The full timed practice quiz draws 52 questions per attempt (or 32 for Cat A), scored against the official EASA 75 % pass mark, with weak-area tracking across attempts.
Click "Reveal answer + explanation" after you've picked.
Sign up, pick Module 2 from the dashboard, and take a timed exam drawn from our 998-question bank — the number of questions follows your licence category (32 for Cat A, 52 for B1/B2/B2L/B3). Your score is tracked across attempts and we surface your weakest sub-topics so revision time pays off.
Free download
The complete EASA Part-66 handbook — licence categories, all 17 modules, exam format and pass marks, experience and OJT, the rules in 11 countries, type ratings and continuation training. Includes 255 practice questions with explanations. 2026 Edition, PDF.
Check your inbox
We have sent your download link. If it is not there in a minute, check your spam folder.
Something went wrong. Please check the address and try again.
We use essential cookies to keep you signed in, plus anonymous analytics to understand how the site is used. Cookie-based analytics is set only with your consent. See our Privacy & Cookie Policy.