No two vivas are identical, but after sitting on and preparing scholars for hundreds of them, we can tell you this: most viva questions are predictable, because examiners are testing the same few things — that the work is yours, that you understand your choices, and that you know the work's limits. Prepare these clusters and you've prepared most of the defence.
The openers (asked in nearly every viva)
- Summarise your thesis in a few minutes — what did you do and why does it matter?
- What is your original contribution to knowledge?
- Why did you choose this topic?
- What motivated the research questions in this form?
Literature and framing
- Whose work most influenced yours — and where do you depart from them?
- Why did you use this theoretical framework and not the obvious alternative?
- What has been published on this since you submitted? (Yes — read recent literature before the viva.)
- Your review cites X heavily; what are the criticisms of X?
Methodology (the hottest zone)
- Why this design and not [the alternative your examiner prefers]?
- Justify your sample size and sampling strategy.
- How did you establish reliability and validity?
- Why SmartPLS rather than AMOS (or vice versa)? Why these tests?
- What are the limitations of your method, and why are your findings still credible?
Findings and contribution
- Which finding surprised you? Which hypothesis failed, and what does that mean?
- Walk me through this table — what exactly does this coefficient tell us?
- How would a practitioner use your results?
- If you started again tomorrow, what would you do differently?
The answering pattern that works
Examiners aren't hunting for perfect answers; they're checking for ownership. The pattern that consistently lands: give the direct answer first, then the reasoning, then acknowledge the limitation honestly, then stop talking. Defensiveness and rambling create follow-up questions; calm, bounded honesty closes them. Practise aloud — knowing an answer and saying it fluently are different skills, which is why our viva preparation runs full mock vivas.
'Is this genuinely your work, and do you understand it?' If your thesis is truly yours, the viva is a conversation between colleagues. This is also why purchased or ghostwritten work fails here — see our honest answer on paying someone to write your thesis.
Frequently asked
How long does a PhD viva last?+
In India commonly 1–2 hours including the presentation; UK vivas often run 2–4. Length signals engagement, not trouble — long discussions frequently precede clear passes.
Can you fail a PhD viva?+
Outright fails are rare; the common outcomes are pass, minor revisions or major revisions. Most 'bad' vivas trace to candidates who couldn't justify methodological choices — which is preparable.
How should I prepare in the last two weeks?+
Re-read your thesis with an examiner's eye, prepare your summary and contribution statements, list your weakest points and rehearse honest answers, check recent literature, and do at least one full mock viva aloud.
phdguide's mentors are senior academics, former supervisors, statisticians and publication specialists with 25+ years of combined experience guiding MBA, MPhil and PhD scholars from topic to viva.
Ethical, compliant guidance: We provide academic support, mentoring, analysis, editing and structuring — not authorship. Your work stays compliant with university policies.