Christ's College Cambridge Natural Sciences Interview

Christ's College Cambridge has an outstanding tradition in the natural sciences, with alumni including Charles Darwin and a long history of producing significant scientists across biology, chemistry, and physics. Its Natural Sciences interviews reflect this tradition: supervisors are looking for students who engage with scientific problems the way scientists do — with curiosity, precision, and a willingness to push beyond what they already know. The interview is not a test of how much you have studied but of how well you reason, and the most successful Christ's candidates are those who can make genuine intellectual progress on problems they have never encountered before.

Natural Sciences at Cambridge requires you to study three science subjects simultaneously in your first year, making scientific breadth essential. Christ's NST supervisors may probe any of the sciences in your application — physics, chemistry, or biology — and will specifically look for evidence that you can reason across disciplinary boundaries. Candidates who have prepared only in their strongest subject and are caught off-guard by questions in another area consistently underperform.

Christ's Natural Sciences Interview Format

NST applicants at Christ's typically have two interviews. Each lasts approximately 25 to 35 minutes and is problem-led. Supervisors present scientific questions — often involving data, diagrams, or novel scenarios — and observe as you reason through them aloud. Christ's NST interviews are known for following threads wherever they lead: a question that begins in chemistry may evolve into physics when the supervisor introduces a related constraint, or into biology when an application to living systems becomes relevant. This interdisciplinary probing is deliberate and designed to assess exactly the kind of scientific thinking that the NST curriculum demands.

The ESAT is used to shortlist NST candidates at Cambridge, and Christ's uses these scores as a primary shortlisting tool. Strong ESAT performance — particularly in the areas corresponding to your chosen science subjects — is important for securing an interview invitation.

Preparing for Christ's Natural Sciences Interviews

Prepare across all of your science subjects, not just your preferred one. Christ's NST supervisors will move between disciplines at will, and breadth of scientific reasoning is an explicit part of what they assess. Candidates with strong chemistry and weak physics, or strong biology and weak mathematics, regularly find Christ's interviews harder than expected.

Focus on understanding mechanisms rather than memorising facts. A-level biology and chemistry in particular can encourage superficial knowledge — knowing that something happens without understanding why it happens at the molecular or physical level. Christ's supervisors consistently distinguish between candidates who can describe phenomena and those who can explain them from first principles. The question is always “why does this happen?” not “does this happen?”

Develop comfort with uncertainty. Christ's supervisors will present questions you cannot fully answer. Your response to that situation — how you reason towards a partial answer, how you use what you do know, how you identify what you would need to know to go further — is a significant part of what they are assessing. Intellectual honesty and persistence under uncertainty are genuinely valued.

Our Cambridge Natural Sciences interview preparation service provides cross-disciplinary coaching and mock interviews from Christ's and other Cambridge NST graduates.

Example Christ's Natural Sciences Interview Questions

• Why does ice float on water? What would happen to life on Earth if it did not?
• Sketch the electron energy levels for hydrogen. What happens when an electron drops from a higher to a lower level?
• A reaction produces a gas at constant temperature. Sketch how the rate of reaction might change over time.
• What is a catalyst? How does it work at the molecular level?
• If you compress a gas very quickly, why does its temperature rise?
• What is the difference between mitosis and meiosis, and why does each process matter?

For free practice material, see our Cambridge Natural Sciences interview questions resource.

Frequently Asked Questions

Is Christ's a good college for Natural Sciences at Cambridge?

Yes. Christ's has an excellent track record in Natural Sciences and a strong community of NST supervisors across the physical and biological sciences. The college's history in science — including its association with Darwin — reflects a genuine tradition of scientific inquiry that is still present in the intellectual culture of the college. NST students at Christ's report strong supervision and a supportive academic environment.

Will both my interviews be in the same science subject?

Not necessarily. Christ's may interview you with supervisors from different science disciplines, particularly if your application indicates interests across multiple areas. Even if both interviews are nominally in your primary subject, supervisors at Christ's are known for introducing cross-disciplinary questions. Prepare across all your science subjects rather than assuming your interviews will stay within one discipline.

How should I approach a question where I genuinely do not know the answer?

Think aloud and reason from what you do know. Tell the supervisor what you understand about the relevant area, identify what principles might be relevant, and make as much progress as you can with the tools you have. Saying “I don’t know the answer, but if I think about conservation of energy here...” is far more informative than silence. Supervisors are specifically assessing how you reason under uncertainty, not whether you happen to know the answer.

What should I read to prepare for a Christ's NST interview beyond A-level?

Books like Richard Dawkins' The Selfish Gene (biology), Marcus Chown's Quantum Theory Cannot Hurt You (physics), or Peter Atkins' Physical Chemistry (chemistry) provide accessible introductions to ideas beyond A-level that directly enrich scientific interview performance. The key is active engagement — reading to understand and question, not just to collect talking points.