Extended Response Question generator · IB DP Physics 2025 syllabus
Authentic IB-grade Paper 2 questions, generated to spec.
An Extended Response Question (ERQ) is the multi-part 10–16 mark problem at the heart of IB Physics Paper 2 — a novel real-world stem, parts (a)/(b)/(c)/(d) walking a strict cognitive ladder, and a discriminator that asks the student to critique the model. This site generates ERQs that hit the IBO bar, anchored on 26 tagged past-paper exemplars and a critic ensemble that enforces every rule of the contract.
What's an ERQ?
IB Physics Paper 2 contains a handful of ERQs worth 10–16 marks each. Unlike a Paper 1 multiple-choice, an ERQ has a multi-sentence stem (a real-world scenario with data), followed by parts labelled (a), (b), (c), (d). Each part has a strict mark allocation and a specific command term that signals the assessment objective:
- Part (a) — entry · 1–3 marks · "State / Define / Outline / Draw" · AO1+AO2
- Parts (b)+(c) — calculation · 2–4 marks each · "Calculate / Determine / Derive / Show that" · AO2+AO3
- Final part — discriminator · 2–3 marks · "Explain / Suggest / Evaluate" · AO3 only · asks the student to critique the model used
Authentic ERQs always blend two sub-topics from different themes (e.g., kinematics + radioactive decay) — that cross-pollination is what separates a real IB question from a textbook drill. Generators that miss this constraint feel "off" to teachers. We enforce it as a hard rule.
Cross-theme integration
Every question blends two sub-topics from different themes (A/B/C/D/E), because real IB Paper 2 ERQs always do.
Cognitive ladder + Rule of One
Part (a) eases the student in. Middle parts demand multi-step calculation. The final part critiques the model. Every mark equals one distinct operation.
ECF-aware mark schemes
Mark schemes tag each method-step independently. A wrong upstream value never dooms a downstream method mark.
Anchored on the corpus
Every generation is grounded on the nearest past-paper exemplars from the IBO archive — same vocabulary, same register, same examiner expectations.
How it works
- Planner picks the stem archetype + cognitive ladder + cross-pollination point.
- Author writes the question + mark scheme, grounded on 2 nearest exemplars from the tagged corpus.
- Critic ensemble (5 specialists) scores topic accuracy, AO ladder, Rule-of-One, cross-theme, discriminator. Each returns pass/fail + reasoning.
- Reviser re-runs the author with critic feedback. Up to 2 retries before bubbling up to human review.
- You grade the output. Verdicts update the rubric, which sharpens the next generation.
A typical run takes 60–90 seconds. Watch live progress when you generate one.