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Top 10 Ph.D. Viva Questions and How to Answer Them

EditrixJD

Every doctoral candidate will complete the Ph.D. viva to defend a thesis and seek that coveted doctorate degree. You've worked hard throughout your academic career, and now you face this intimidating meeting! Before your viva, you might feel nervous, picturing yourself tap dancing as fast as you can in front of a firing squad. But your viva should feel more like a confident performance of your crowning research for an audience of adoring fans. Take a breath—you've done good work, and soon the committee will see that, too.

What is a Ph.D. viva? In this case, viva is short for viva voce, Latin for "living voice." The term refers to contexts in which responses to something are given out loud for people to hear, for example a real-time vote (all in favor, say "aye"!). In the academic context, the Ph.D. viva is a discussion between you (the Ph.D. candidate) and a panel of academic experts, during which you present your Ph.D. thesis. The panel of experts can include an internal and/or external examiner, your Ph.D. supervisor, and other people you can request to be in attendance, like your family members.

The examiner's main purpose is to determine that you've written your own thesis and ask you some probing questions about the work you've done. It's intended to be an open, frank conversation about your research, not an interrogation. Don't be afraid to challenge points your examiner makes if they don't align with what you've found in your study. Your expertise and passion about your work will demonstrate that you know your stuff and care deeply about it.

Of course, in order to think clearly and objectively about the subject you've been immersed in for months, you will need a healthy dose of confidence. To help you gain that confidence to make your viva a positive experience, preparation is key. Here are some prompts and questions you might be asked and how you can prepare beforehand to answer them.

1. Tell us about your study

Usually the first question is an opener and is asked with the goal of breaking the ice and getting you talking about your thesis. The items the panel presents to you will start broad and get more specific and involved as your viva progresses. Since you're here to talk about your project, give a good overview of who you are, your history in the field, and the process you followed in your study. You will have a lot of potential detail to provide, but since you won't know how much your panel is looking for, prepare synopses of different lengths: 1-minute, 3-minute, and 5-minute summaries.

2. What are your main research questions and why did you select them?

You'll very likely be prompted to talk about your research questions in detail, so be prepared to list the questions you set out to answer and the motivation behind selecting each one. Also, be prepared to discuss your aims, objectives, and hypotheses, just in case they ask about those as well.

3. What original contribution has your thesis made to this field of study?

Before you began your study, you probably looked at the gaps in the existing literature and decided on a research direction to fill those gaps. Now that you've finished your research, tell your panel what the world knows now as a result of your work. When future researchers delve into your subject matter, what will they cite you on?

4. Whose work has most influenced yours?

Because you went through the process of determining what your field of study still needs in terms of research and the kind of analysis that will contribute to it, you possess a pretty clear understanding of what has already been done. A lot of that knowledge comes from your academic journey leading up to the awarding of your doctorate, during which you've read a lot of papers and delved into the work that has been done before yours. Talk about the most influential works you've encountered. This can be a work that inspired you or papers that you felt were done poorly and motivated you to get it right. Bonus: The chair of the viva will be someone who knows a lot about your field, so take some time to get familiar with his or her work. Don't be a stalker, but be prepared to mention that you know what he or she has done. Not only will that demonstrate that you've prepared yourself for your presentation, but it will also show an interest in his or her life's work, which can't hurt. Don't spend too long on this, though—you're here primarily to talk about your work, not theirs.

5. What are the strengths and weaknesses of your thesis?

You certainly want to brag about your thesis and offer reasons why you and your work are great, so don't hold back about what went right. Start with the strengths; outline your main findings and give reasons why your study enabled you to uncover them. Then, while it might feel counterintuitive to point out the ways that your thesis isn't the greatest ever, a report about the weaknesses of your research shows a sense of self-awareness and humility that benefits your study in that it paves the way for future researchers and shows that you aren't blind to your own potential for growth. If you prepare your response to this question before your viva, you can craft your response to show that you have already thought about the ways you can address the weaknesses of your thesis.

6. What ethical considerations did you apply?

Most Ph.D. candidates encounter ethical issues during the course of their research, and the committee might want to know whether you took measures to ensure an ethical project. Did you follow any ethical protocols in gathering data? Did you provide informed consent to participants in your study? What are the ethical implications of your work?

7. Did your study go as expected? If you had to start the thesis again, what would you do differently?

Every researcher has at least some idea of what he or she might find upon performing a study. Many form research questions and perform the study to provide support for that expected outcome, but sometimes the research leads to a different result. Consider what your own expectations were before you began and the path your research process took, either in alignment with that expectation or not. Knowing what you know now, would you change anything about your research? Would you approach the process differently? Maybe you would forego a step or two knowing that it wasn't as consequential or helpful as you originally thought.

8. Now that you've completed your study, what did you enjoy about the process?

Ph.D. thesis examiners are looking for a candidate who is passionate about the work. Remember that they know exactly how stressful the process is, so avoid delving into the hardships you encountered. Instead, give a summary of the high points and the reasons you were excited to keep going. While you should keep the tone professional and avoid gushing, feel free to talk about your personal motivation for pursuing this study.

9. If funding was no object, how would you follow up on this project?

Every researcher faces limits regarding the scope of a study that prevent them from gathering as much data as they'd like. Time limits, budget caps, and lack of interest or willingness among study participants can all put a damper on the dreams a researcher has for an analysis. Money can solve most obstacles within an examination, so dream big—what could you make happen with an infinite budget? This is another question that reveals your passion for the subject.

10.What are your plans for the future?

Questions might not be limited to your thesis, so give some thought to where you will go from here. Describe your plans for your future research or professional pursuits; this gives the panel a sense of your passion for the work and sets you apart from a doctoral candidate who is just trying to check the boxes and get a diploma in hand.

The questions your panel asks you on the day of your viva will probably not be exactly the ones listed in this article, but these topics will almost certainly be covered during the discussion with your examiner. If you prepare responses to these questions and make sure you know your thesis inside and out, you will be much more ready to answer whatever the experts ask you. Equally important, planning out your responses will also help calm your nerves before this very important event, so give yourself the gift of preparation as you anticipate your Ph.D. viva. Good luck—you'll do great!

Header image by lightpoet .

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The Savvy Scientist

The Savvy Scientist

Experiences of a London PhD student and beyond

Common PhD Viva Questions

PhD interview scenario

It can be pretty difficult knowing how to prepare for your PhD viva. Having successfully defended my own STEM PhD remotely in the last year, I want to help you to prepare! What follows are some common PhD viva questions which your examiners may ask you. Plus some additional advice based off my own PhD viva experience.

For an intro to the PhD viva including the typical structure and potential outcomes please see my introductory post:

  • How to Defend a Thesis: An Introduction to the PhD Viva

How Much Do You Need to Prepare For A PhD Viva?

There is no hard and fast rule for how much you need to prepare. And unlike a written exam, there are of course no past-papers to practice on!

It may help ease your mind to think about what the purpose of a PhD viva is. Namely the purpose of the PhD viva (or defence) is to check that:

  • You did the work;
  • You understand the work;
  • The research is up to the standard for a PhD.

For more detail see my separate post here including Imperial’s PhD viva mark scheme.

In hindsight I probably didn’t spend as much time preparing for my viva as is normal. Though I did unexpectedly move house less than a week before !

Besides reading through my thesis once in the few days leading up to it, I didn’t spend much time thinking up answers to questions or “revising” certain topics which could come up. The viva went fine, but it wouldn’t have done me any harm to have been a little better prepared.

It certainly helped that I’d managed to schedule a viva which took place less than six weeks after I submitted the thesis so it was all very fresh in my mind. If you submitted your thesis months before your viva I’d suggest spending slightly more time refreshing your memory in preparation for questions you may get asked.

In summary, I think it’s useful for all PhD students to get an idea of some potential lines of questioning for their oral exam!

Update: Keen to get prepared for your viva? I’ve put together a set of viva preparation worksheets which are available in the resource library. Click the image below for free access!

phd transfer viva questions

Listed below are common PhD viva questions which I’ve roughly grouped together. We’ll start with some higher-level questions about your PhD which should be quite easy and friendly, then progress through to some more technical (and potentially unfriendly!) questions.

It is worth noting that many examiners will ask for a short presentation at the start of the viva and this could eliminate some potential questions. In this list I’ve left in the main questions I’d expect for this presentation to address, such as what future work you’d recommend.

Very few of the questions are ones you’re guaranteed to get asked, but I can assure you that you’ll get asked at least some of them!

General PhD Viva Questions – usually friendly!

These ones are simply inquisitive and you don’t really have to worry about getting caught out. The examiners are simply interested in the work and want an insight from someone who has spent the last few years working on it.

  • What is the most important finding from your PhD work?
  • What was the motivation behind this research?
  • Who is your research relevant to?
  • Which aspects of your work are you publishing? Follow on: and where?
  • What future work would you recommend?
  • What are the limitations of your research?
  • Which aspect of your work surprised you the most?
  • What are the potential applications of your PhD research?

Method-Specific Questions – mostly friendly!

These questions dive a little deeper but even so shouldn’t be too much of a cause for concern. They come down to your own judgement and as long as you justify your decicisions you’ll be fine in answering them.

  • Why did you do [things] a certain way?
  • What were the alternatives to [this certain method]?
  • Why did you test [that specific number] of samples?
  • What effect did you think changing [something in your method] would have?
  • What do you think you could have gained by using [another approach]?
  • Why did you not use [another technique]?
  • How did you deal with the ethical implications of your work?

Results & Analysis-Specific Questions – mostly friendly!

In a similar manner to the previous section about your methodology, you’ll often get some questions targeting your analysis and presentation of results.

  • What is this graphical figure illustrating?
  • Why was [this analytical technique] appropriate? Follow on: why did you use [this other technique]?
  • Which of your results do you find the most interesting?
  • How do you know that your findings are correct?

Literature Questions – may be less friendly!

This is where things may get tough if your examiners want to try and test your limits. Even so, they’ll still likely cut you some slack. If you have 100+ references it’s very possible that under the nerves of your exam you can’t remember specifics for each and every reference. Just don’t make things up. They’d rather you were honest than trying to deceive them.

  • Please explain the key findings of reference number [X]
  • Which papers would you say had the biggest impact on your work?
  • What do you think are the biggest differences between [these two previous studies]?
  • What have been the biggest advancements in the field over the last 10 years?
  • Why did you not reference [this other study]?
  • How does your work compliment the existing literature?
  • What do you think the next big advancements will be in the field?

Highly Technical Questions – potentially very unfriendly!

These are the ones I was a bit scared of getting, but it is a PhD viva after all. Of course it should be expected that you have a solid understanding of the principles that underpin your project. Even so it can be unnerving thinking of how large the range of potential questions like this can be!

Unlike at a conference or in other settings where you may be able to brush over things you’re not 100% comfortable with, there is no hiding when your examiners need to test your knowledge. Particularly when they have hours of time at their disposal to do so!

  • Explain how [a technique] works. This could be anything from sample preparation, equipment and analysis through to statistics. I’ve known people to get asked to explain things like a statistical t-test from first principles, with follow-on questions being asked with every answer to drill deeper.
  • Explain [some fundamental concept, phenomenon or principle]. Just like the last question but applied to basic-sciences. I’ve known students to get asked questions such as: explain energy (to a mechanical engineer) and explain toughness (to a materials scientist). I’m sure we can all explain these concepts to a certain level but my concern was whether or not I could explain them at a deep enough level to satisfy the examiner.

With both of these types of questions there ultimately comes a point where you (or the internal examiner ) can push back and say that answering that question was not the focus of your PhD!

What Questions I Got Asked at My Own PhD Viva

I was really surprised at my own viva how few questions I actually got in general.

The viva lasted a whopping five hours (excluding a quick break) and yet almost all of the time was spent discussing improvements to my viva to help with publishing papers.

Even so, I could have done with putting a bit more time into preparing for potential questions: which was my motivation to help you by putting together this post!

The few questions I had included:

  • If you were to do the project again would you do anything differently?
  • Clarification of what I meant by certain sentences in my thesis .

You may be wondering if I avoided getting asked deeper questions by the examiners because I already had a relationship with them so they were satisfied with my knowledge and capabilities. But I didn’t really know the examiners! I’d met my external examiner at a conference and he had seen me present but I’d never actually met my internal examiner before.

Instead, what I think did go a long way to helping was having already had something published in a respected journal.

Nevertheless, in a way I actually walked away a little unsatisfied by the lack of questioning at my PhD viva.

It was great to get so much feedback on my thesis which has already helped to get two more papers published since the viva, but I felt like it would have been nice to feel a bit more taxed and known that I could hold my own in the exam if it came down to it.

Now looking back on the viva 10 months later, I’m just happy to have the PhD done!

My Tips for Answering Common PhD Viva Questions

  • Keep calm and take your time before answering . There is no rush to answer questions. Having a sip of a drink may help provide a pause for thinking up an answer.
  • Tell the truth. If you don’t know something, just say so! It’s likely the examiners will quickly be able to tell that you don’t know what you’re talking about. Plus, there is the risk that they’ll ask deeper follow-on questions which could unravel any lies.
  • Try to enjoy the experience. Think of it as a discussion, rather than a police investigation. Your examiners are interested in the work and want to hear more about it!

If you’d like personalised help with preparing for your PhD viva I am now starting to offer a small number of one-to-one sessions. Please contact me to find out more or click here to book a call.

I hope these common PhD viva questions can help you to prepare for your own viva.

If there are other aspects of the examination you want covered, just let me know.

I have many more upcoming PhD (and beyond!) posts . I f you want to get notified about them you can subscribe here:

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