The most common PhD viva questions ask you to summarise your thesis in a sentence, justify your original contribution, defend your methodology, and explain how your work fits the wider field — examiners almost always open with “Tell us about your thesis” and “What is your original contribution to knowledge?” before probing your design choices, results and limitations. The viva voce is an oral defence in which two examiners (usually one internal, one external) test that the thesis is your own work and that you can think on your feet about it. This guide lists 40+ real questions UK doctoral candidates are asked, grouped by stage of the exam, with model answers, a worked mock-viva example, a question-type table, and a six-step preparation plan so you walk in knowing exactly what is coming.
What the PhD viva actually tests (and why the questions repeat)
The viva voce — Latin for “by living voice” — is the final oral examination of your doctorate. It is not a hostile interrogation designed to catch you out; it is a structured academic conversation whose purpose is set out in every UK university’s regulations: to confirm that the thesis is your own work, that it constitutes an original contribution to knowledge, and that you understand it deeply enough to defend the choices behind it. Because that purpose is fixed, the questions are remarkably predictable. Examiners across institutions reach for the same opening prompts, the same probes about methodology, and the same closing questions about future research. Once you understand what a PhD is and what it is meant to demonstrate, the recurring shape of viva questioning makes sense — and becomes far less frightening.
A typical UK viva runs between one and three hours and is conducted by two examiners: an internal examiner from your own institution and an external examiner from another university who is a recognised authority in your field. An independent chair or a non-examining observer may also be present, and since 2019 most universities allow your supervisor to attend as a silent observer if you request it. The examiners will have read your thesis closely, annotated it, and agreed a preliminary view before you walk in — the viva is where they test that view against the person who wrote it.
This guide groups the most common PhD viva questions into the order an examiner is likely to ask them: opening and overview questions, originality and contribution questions, literature and context questions, methodology and design questions, results and analysis questions, limitations and criticism questions, and closing and future-work questions. Treat the lists below as a bank to rehearse from, not a script to memorise — examiners reward fluent, thoughtful engagement, not recitation.
The seven types of PhD viva question at a glance
Almost every question you will face belongs to one of seven families. Knowing the family tells you what the examiner is really checking and how to frame your answer.
| Question family | Typical opener | What the examiner is testing | How to frame your answer |
|---|---|---|---|
| Opening / overview | “Tell us about your thesis in a few sentences.” | Can you see the wood for the trees? | One-sentence summary, then aim, then headline finding. |
| Originality / contribution | “What is your original contribution to knowledge?” | Whether the doctorate threshold is met. | Name 2–3 specific, defensible contributions. |
| Literature / context | “Where does your work sit in the field?” | Command of the scholarly conversation. | Position against key authors and the gap you fill. |
| Methodology / design | “Why did you choose this method?” | Whether choices were deliberate and justified. | Rationale, alternatives rejected, fit to question. |
| Results / analysis | “What was your most surprising finding?” | Depth of engagement with your own data. | Specific finding, evidence, interpretation. |
| Limitations / criticism | “What are the weaknesses of your study?” | Scholarly honesty and self-awareness. | Acknowledge, contextualise, mitigate. |
| Closing / future work | “What would you do differently / next?” | Maturity as an independent researcher. | Concrete next study, publication plan. |
Opening and overview questions
The opening minutes are designed to settle your nerves and let you talk about something you know better than anyone in the room — your own work. They are the easiest marks in the viva, yet candidates routinely fumble them by over-explaining. Prepare a thirty-second answer and a three-minute answer to each, and let the examiner steer which they want.
- Tell us about your thesis in one or two sentences.
- Summarise your key findings for someone outside your field.
- Why did you choose this topic, and how did your interest in it develop?
- What is the central research question your thesis answers?
- How did your research question change over the course of the PhD?
- If you had to give your thesis a different title, what would it be?
- What did you enjoy most, and what did you find most difficult?
The single most important preparation you can do is to be able to state your thesis in one clean sentence. If you cannot summarise three or four years of work in twenty-five words, the examiners will worry that you cannot see your own argument clearly. A reliable formula is: “My thesis investigates [problem] using [approach], and shows that [headline finding], which matters because [significance].”
“The viva is the one occasion in a researcher’s life when two experts read every word you have written and want to spend hours discussing it with you. Approached in that spirit, it stops being an ordeal and becomes the best conversation about your work you will ever have.” — Prof. Gina Wisker, author of The Good Supervisor
Originality and contribution questions
This is the heart of the doctoral examination. A PhD is awarded for an original contribution to knowledge, so examiners must satisfy themselves — and be able to write in their report — that your work clears that bar. Expect to be pressed hard here, and expect the examiner to be sceptical not because they doubt you but because their job is to make you prove it.
- What is your original contribution to knowledge?
- What is new, true and important about your work — and which of those matters most?
- Which part of the thesis are you most proud of, and why?
- If you removed one chapter, would the contribution still stand?
- How is your work different from [a named recent study in the field]?
- Could a Master’s-level researcher have produced this? If not, why not?
- What three findings would you want a reader to remember in a year’s time?
Strong candidates name two or three specific contributions rather than gesturing vaguely at “filling a gap.” A contribution can be empirical (new data or a new dataset), theoretical (a new model, framework or concept), methodological (a new technique or a novel application of an existing one), or contextual (the first study of a phenomenon in a particular setting). Say which type yours are and why each is defensible.
External examiner: “You claim an original contribution to knowledge. Be precise — what exactly is new here?”
Candidate (weak answer): “There hasn’t been much research on this topic, so my thesis fills that gap.” (This invites the killer follow-up: “Why was there a gap — perhaps because the question isn’t worth answering?”)
Candidate (strong answer): “My thesis makes three contributions. First, it is the first study to apply the [X] framework to [Y context], which extends a theory previously tested only in [other context]. Second, it produces an original dataset of 312 longitudinal cases that future researchers can build on. Third — and this is the one I’d most defend — it identifies a mechanism, [Z], that the existing literature predicted should not occur. That finding is on pages 148 to 156, and it is what reframes the debate I set out in Chapter 2.” (Specific, signposted to page numbers, ranked, and tied back to the literature.)
Literature and theoretical context questions
Examiners use these questions to check that you are a full member of your scholarly community — that you know the conversation you are joining and can locate your own voice within it. A confident answer cites the two or three figures who define your sub-field and explains precisely where you agree, disagree, or extend them. Your literature review chapter is your evidence base here, so reread it the week before and be ready to defend every author you chose to foreground or omit.
- Who are the key thinkers in your field, and where do you stand relative to them?
- Which theoretical framework underpins your thesis, and why that one?
- What did you choose to leave out of your literature review, and why?
- Has anything important been published since you submitted that affects your argument?
- How would [a named theorist] critique your conclusions?
- Which single book or paper most shaped your thinking?
Because new work appears constantly, examiners often ask whether anything published after submission changes your view. The right answer shows you are still reading: name a recent paper, say briefly how it relates, and explain whether it strengthens, complicates or leaves your argument untouched. “I’m not aware of anything” is the answer to avoid.
Methodology and research design questions
Methodology questions are where weak vivas are won or lost, because every design choice you made is, by definition, a choice you could have made differently — and the examiner will ask why you didn’t. The principle to internalise is that there are no “perfect” methods, only methods that fit a question well or badly. Defend yours on the grounds of fit. If you want to brush up on the vocabulary of paradigms, sampling, validity and reliability before you go in, revisiting the fundamentals of research methodology will help you answer with precision.
- Why did you choose this methodology, and what alternatives did you reject?
- What is the philosophical position (ontology and epistemology) underpinning your design?
- How did you ensure the validity and reliability — or trustworthiness — of your findings?
- Why this sample size, and how did you recruit your participants?
- What ethical issues did your study raise, and how did you handle them?
- If you repeated the study, what would you change about the design?
- How generalisable are your findings beyond your sample or setting?
A common trap is the “why not” question — “Why didn’t you use a mixed-methods design?” or “Why not a larger sample?” Examiners are not necessarily saying you were wrong; they are testing whether your choice was deliberate. The strong move is to show you considered the alternative, name its genuine advantages, and explain the specific reason it did not suit your research question or your constraints of time, access or funding.
Results, analysis and discussion questions
Here examiners check that you truly own your data — that you did the analysis yourself, understand its limits, and can interpret it rather than just describe it. Be ready to be taken to a specific table or figure and asked to explain it cold.
- What was your most important — or most surprising — finding?
- Walk me through the table on page X. What does it actually show?
- Did your results support or contradict your initial hypotheses?
- How confident are you in this finding, and what could undermine it?
- Is there an alternative interpretation of this result that you rejected?
- What do your findings mean for practice or policy in your field?
When you are asked about a surprising finding, resist the urge to smooth it away. Examiners value candidates who can sit with an anomaly, offer the most plausible interpretation, and acknowledge the competing one. A finding that contradicted your hypothesis is not a failure — handled well, it is often the most interesting thing in the thesis.
Limitations and criticism questions
No study is flawless, and examiners know it. What they are testing with limitations questions is your scholarly honesty: a candidate who claims their work has no weaknesses looks naive, while one who names limitations clearly and explains how they were mitigated looks like a mature researcher. The art is to acknowledge the limitation, put it in proportion, and show it does not fatally undermine your conclusions.
- What are the main limitations of your study?
- What is the weakest part of your thesis, in your own view?
- If a critic wanted to attack your conclusions, where would they aim?
- How do your limitations affect the claims you can make?
- What would you do differently if you started again tomorrow?
- Are there findings you are less confident about than others?
Closing and future-research questions
The viva usually closes by looking forward, which is a good sign — examiners testing your future plans are generally satisfied that the thesis itself stands. Treat these as an invitation to show you have become an independent researcher who can see beyond the doctorate.
- What would your next research project be?
- Which parts of the thesis do you intend to publish, and where?
- How will this work develop the field over the next five years?
- What advice would you give a student starting this PhD?
- Is there anything you wanted to discuss that we haven’t asked about?
That final question is a gift. Have one prepared point ready — a strength of the thesis you are proud of, or a nuance you wanted the chance to explain — so you end the examination on your own terms rather than with a flat “no.”
Viva outcomes: what the examiners decide afterwards
After the questioning, you will normally be asked to leave the room while the examiners agree their recommendation, then called back to hear it. Knowing the range of outcomes in advance removes a great deal of fear: the overwhelming majority of UK candidates pass with corrections, and an outright pass with none is rare precisely because examiners almost always find something to tighten.
| Outcome | What it means | Typical timeframe to complete |
|---|---|---|
| Pass with no corrections | Thesis accepted as submitted. Rare. | None |
| Minor corrections | Typos, clarifications, small additions. The most common outcome. | Up to 3 months |
| Major corrections | Substantive revisions, sometimes new analysis; no second viva. | Up to 6 months |
| Revise and resubmit | Significant rework; a second viva may be required. | Up to 12–18 months |
| MPhil awarded | Work judged of Master’s, not doctoral, standard. | n/a |
| Fail | No degree awarded. Very rare in practice. | n/a |
If you receive corrections, do not be disheartened — they are the norm, not a verdict on your ability. Address each point methodically, keep a tracked-changes log showing what you altered, and submit within the window your university sets. For candidates who want a careful second pair of eyes on the thesis before the viva, or structured help acting on corrections afterwards, ResearchProspect’s PhD thesis help service pairs you with subject-matter specialists who have been through the process themselves.
A six-step plan to prepare for your viva
Preparation is what converts a daunting unknown into a manageable performance. The following routine, started four to six weeks out, covers what almost every successful candidate does; for a deeper, step-by-step walkthrough see our dedicated guide on how to prepare for a PhD viva.
- Reread your thesis cover to cover with fresh eyes, annotating it as an examiner would and noting every claim you would have to defend.
- Write a one-page summary capturing your research question, contribution, methods and key findings — your mental map for the day.
- Prepare answers to the seven question families above, with a short and a long version of each, but rehearse the ideas, not a word-for-word script.
- Run a mock viva with your supervisor or peers, ideally with someone outside your immediate area asking the awkward questions.
- Research your examiners: read their recent work so you understand the lens through which they will read yours.
- Prepare the logistics and errata: tab your thesis, list any typos you have spotted, and know whether the viva is in person or online.
Knowing where the viva sits in your wider doctoral timeline also steadies the nerves. If you are still mapping out the months ahead, our explainer on when a dissertation is due during a PhD programme shows how submission, viva and corrections typically fall, and our overview of the PhD journey and the viva voce examination set the wider context. Candidates who are still drafting the thesis itself may also find our guidance on how to write a dissertation and our full dissertation support services useful in getting the document into the strongest possible shape before it reaches the examiners.
Five mistakes that undermine otherwise strong candidates
Most viva problems are not about knowledge — they are about delivery and mindset. Avoid these common errors.
- Memorising scripted answers and then freezing when the question is phrased differently from how you rehearsed it.
- Becoming defensive when challenged, rather than treating criticism as an invitation to discuss.
- Claiming the thesis has no limitations — this reads as a lack of self-awareness, not confidence.
- Failing to reread the thesis, then being unable to find the table or argument the examiner points to.
- Answering the question you wish you had been asked instead of the one in front of you.
Get those five right and you are most of the way there. The viva rewards the candidate who is fluent in their own argument, honest about its limits, and genuinely interested in the conversation — which, after years of work, you already are.
Walk into your viva fully prepared
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