Real interview questions with model answers, written by Oxford & Cambridge academics.
Book a Free ConsultationOxford and Cambridge Physics interviews are problem-solving sessions that resemble the opening minutes of a research conversation. Interviewers present physical scenarios — some familiar in structure, all unfamiliar in specific detail — and ask you to reason your way to an answer while they observe. The process is the assessment. A candidate who reaches the correct answer silently is less impressive than one who demonstrates rigorous physical thinking, clear communication, and the ability to self-correct under pressure.
Oxford Physics candidates typically have two 25–30 minute panel interviews at their applied college. One interview often focuses on mechanics, electromagnetism, and mathematical physics; the other on waves, thermodynamics, or modern physics — though this varies by college. Cambridge Natural Sciences (Physical) candidates have two panel interviews reflecting the broad first-year NatSci syllabus. The PAT (Physics Admissions Test) is used by Oxford Physics for shortlisting for 2026 entry, transitioning to the ESAT from 2027. Cambridge NatSci uses the ESAT from 2025. Approximately 190 students are admitted to Oxford Physics annually.
| Factor | Oxford Physics | Cambridge NatSci (Physical) |
|---|---|---|
| Annual intake | ~190 | ~250+ (Physical route) |
| Pre-interview test | PAT (2026); ESAT from 2027 | ESAT from 2025 |
| Interview format | 2 panel interviews | 2 panel interviews; pool possible |
| Estimation questions | Very common | Common |
| Mathematics required | Calculus, vectors, dimensional analysis | Calculus, vectors, formal maths |
Mechanics and dynamics. Problems involving forces, energy conservation, momentum, circular motion, and simple harmonic motion — always in unfamiliar settings. "A ball rolls without slipping down an inclined plane — derive an expression for its acceleration." "A mass attached to a spring is released from rest at an extension x. At what point in its motion is the velocity maximum?" Setting up free-body diagrams and applying conservation laws systematically are the core skills.
Estimation and Fermi problems. Oxford Physics interviews are well known for estimation questions: "How many piano tuners are there in London?" "Estimate the power output of a typical wind turbine." These test order-of-magnitude reasoning — identifying the relevant physical parameters, estimating each one with a stated justification, combining them using the appropriate relationship, and checking the result is physically plausible. The process matters more than the specific number.
Electromagnetism and circuits. Electric and magnetic fields, inductance, capacitance, and circuit behaviour under changing conditions. A common type: "What happens to the current in this RL circuit immediately after the switch is opened, and how does it change over time?" This requires understanding of the circuit time constant L/R and the qualitative behaviour of RL circuits, not just Kirchhoff's laws.
Waves and optics. Interference, diffraction, standing waves, and polarisation. Questions often ask you to reason about what changes when a parameter is modified: "What happens to the diffraction pattern if you double the slit width?" This requires understanding the inverse relationship between slit width and diffraction angle, not just knowing the formula.
Preparing for your Oxford or Cambridge Physics interview?
Our Physics pack covers mechanics, Fermi estimation, electromagnetism, and waves — each with a full model answer showing the physical thinking interviewers reward. Written by Oxford & Cambridge Physics academics. Rated Excellent on Trustpilot (4.8/5).
Estimation questions are structured reasoning exercises, not guessing games. Start by identifying the relevant physical relationship or formula. Then estimate each required parameter with a stated justification: "Air density is approximately 1.2 kg/m³." "A cyclist's frontal area is roughly 0.5 m²." Combine the estimates using the physical relationship and state the result with appropriate significant figures. Then sanity-check: "This implies a power requirement of about 600 W at that speed, which seems slightly high but the right order of magnitude — a professional cyclist produces 200–400 W, so the discrepancy is within the expected accuracy of this calculation." Narrating this check aloud signals mature physical thinking. Our Physics interview preparation tutors teach this approach through mock sessions with real problems.
"I had no idea what to expect from my interview at Magdalen — A-level gives you no preparation for the style of question they ask. Working through the pack beforehand meant I'd practised thinking through problems I'd never seen before and talking through my reasoning out loud. When I got stuck in the actual interview, I knew how to keep going rather than freeze. I got my offer in January."— James H., Mathematics, Magdalen College Oxford, 2024 entry
"My interview at Gonville & Caius started with a graph I'd never encountered and a question I had no answer to — that's exactly the point, I know now. The pack was the only preparation I found that trains you for that format: the model answers show you how to reason from first principles when you don't know, which is what Cambridge is actually testing. I felt calm in a way none of my friends did."— Priya S., Medicine, Gonville & Caius Cambridge, 2024 entry
The most common types are mechanics and dynamics (forces, energy conservation, circular motion in unfamiliar settings), Fermi estimation problems (order-of-magnitude reasoning about physical quantities), electromagnetism and circuit analysis (field reasoning, RC/RL time constants), and waves and optics (interference, diffraction, polarisation). Questions are deliberately set in unfamiliar contexts to prevent pattern-matching. The assessed skill is applying established physical principles — Newton's laws, energy conservation, Maxwell's equations — to new situations while narrating the reasoning clearly throughout.
Fermi estimation questions ask you to estimate a physical quantity from first principles without precise data. Examples: 'How many piano tuners are in London?' 'Estimate the drag force on a cyclist at 30 mph.' The correct approach: identify the relevant physical relationship or formula, estimate each required parameter with a stated justification, combine the estimates using the physics, and sanity-check the result. The process — systematic parameter identification and explicit reasoning — matters more than arriving at the precise correct number. Practise narrating every step aloud, including the sanity check.
Oxford Physics uses the PAT (Physics Admissions Test) for shortlisting for 2026 entry, transitioning to the ESAT from 2027. Cambridge NatSci uses the ESAT from 2025. Both tests cover physics and mathematics at A-level and beyond. A strong score significantly improves your shortlisting position. Once you reach the interview, the test score plays little direct role — the interview conversation determines the offer. Always check the official admissions pages for the test requirements specific to your entry year, as these are changing for several subjects.
Mathematics is central. Expect to use calculus (differentiation and integration in mechanics and electromagnetism), vectors (field descriptions, force resolution), differential equations (oscillating systems, circuit transients), and dimensional analysis (verifying the form of physical relationships). The emphasis is on setting up equations correctly and reasoning about solutions qualitatively — not on fast numerical computation. A candidate who correctly sets up the differential equation for an RL circuit and explains its qualitative solution will score better than one who quotes the time constant formula without derivation.
Both use two panel interviews of 25–30 minutes. Oxford Physics interviews often divide by topic — one focused on mechanics and electromagnetism, another on waves, thermodynamics, or modern physics — though this varies by college. Cambridge NatSci (Physical) interviews reflect the first-year breadth, potentially combining physics with chemistry and mathematics in a single problem. The main practical difference is the admissions test: Oxford used the PAT for 2026 entry; Cambridge has used the ESAT since 2025. From 2027 both will use the ESAT.
Leading Tuition offers one-to-one Physics interview coaching with tutors who are Oxford and Cambridge Physics academics. Mock sessions use unseen physical problems with real-time feedback on reasoning clarity and self-correction. For self-study, our Physics pack covers mechanics, estimation, electromagnetism, and waves, each with a full model answer. A free sample is available to download. Book a free consultation to discuss your preparation and target colleges.
Further Reading: For real Oxford Physics interview questions including estimation problems and worked solutions, see our companion guide: Oxford Physics Interview Questions 2026 — Estimation Problems and Worked Solutions.
Ready to practise with real Oxbridge Physics interview questions?
Our pack contains real interview problems with full model answers, written by Oxford & Cambridge academics. Rated Excellent on Trustpilot (4.8/5).
Our tutors are Oxford and Cambridge academics who know exactly what interviewers are looking for. Rated Excellent on Trustpilot (4.8/5).
Book a Free Consultation → View all packs and purchase →