The Moment Every Viva Candidate Fears
Almost every Malaysian postgraduate student who has completed their viva will tell you the same thing: there was at least one moment where a question was asked and they did not immediately know the answer. This moment is universal, and it is not the disaster it feels like in the second it happens. Knowing how to respond when you do not know the answer in your viva is a specific skill that can be prepared for and practised — and a candidate who handles this moment gracefully often leaves a stronger impression than one whose preparation was so thorough that no question caught them unprepared.
The reason this moment is so feared is that many Malaysian students equate not knowing an answer with failing the viva. This is not how examiners think about it. The viva is an examination of your scholarly thinking, not a memory test. An examiner who asks a question you cannot immediately answer is often more interested in how you engage with the difficulty than in whether you can produce the correct response on demand.
What Never to Do When You Don’t Know
Before discussing effective responses, it helps to name the approaches that consistently make the situation worse. The first is pretending you know when you do not — constructing an answer from vaguely related knowledge in the hope that it will pass for a real response. Examiners who ask specific technical or methodological questions know the expected answer, and a fabricated response is usually obvious within a sentence or two. The damage to your credibility from being caught speculating without acknowledging uncertainty is significantly greater than the damage from honestly admitting you are unsure.
The second approach to avoid is complete silence — freezing and saying nothing for an extended period. A brief pause to think is appropriate and normal; an extended silent freeze is not. It signals to the examiner that you are paralysed rather than thinking, which is a more concerning signal than uncertainty about a specific point of knowledge.
The third is excessive apologising. Saying “I am so sorry, I should know this, I feel terrible that I cannot answer” makes the moment about your emotional state rather than your intellectual engagement with the question. Examiners are not looking for contrition — they are looking for scholarly response.
Buying Time Professionally
The most immediately useful skill for responding when you do not know the answer in your viva is the ability to buy time professionally — to create a brief, legitimate pause for thought without making the pause feel like a breakdown. Several phrases serve this purpose effectively and sound natural rather than stalling.
“Let me think about that for a moment” is simple and honest. It signals that you are processing the question carefully rather than responding reflexively. “That’s an interesting angle I haven’t considered from quite that perspective — let me think through it” acknowledges the question positively while indicating you need a moment. “Could you clarify what you mean by X in this context?” is useful when the question contains an ambiguous term — and it is not dishonest, because many viva questions do contain terms whose precise meaning in this context matters to how you answer.
Taking three slow breaths while appearing to collect your thoughts also serves the purpose of calming the physiological stress response that a difficult question triggers, without appearing avoidant. The examiner expects you to think before answering — using that expectation as cover for a genuine physiological reset is entirely legitimate.
Honest Partial Knowledge Is Better Than Silence or Fabrication
In many cases where a candidate believes they do not know the answer, they actually have partial knowledge — they know something relevant but not the complete answer the question may be looking for. In the viva, partial honest knowledge is far more valuable than either silence or speculation.
“I don’t have the specific statistics on that in front of me, but what I can say is that the general pattern in the literature suggests…” is a legitimate and often quite useful response. “I haven’t read that specific study, but the argument it seems to be making connects to what Rashid (2022) found, which I engaged with in my literature review” shows you can reason by analogy even when the specific reference is unfamiliar. “My study didn’t directly address that question, but based on the findings I did produce, I would expect…” demonstrates analytical thinking beyond the specific boundaries of your thesis. These responses are honest, they demonstrate engagement, and they often reveal more about your scholarly capacity than a perfectly memorised answer would.
When to Simply Say You Don’t Know
There are questions where the honest answer is genuinely “I don’t know” — and saying so directly, without qualification or embarrassment, is often the most appropriate response. “I’m not familiar with that specific study” or “I haven’t come across that particular debate in my literature review” are honest answers that an examiner respects far more than a fabricated one. Follow the honest acknowledgment with something that shows engagement: “That’s not an area I explored in depth, but I’m curious about how it relates to the findings I presented in Chapter Four — could you tell me more about what that study argues?”
This response converts a knowledge gap into an intellectual exchange that demonstrates your scholarly curiosity and your ability to engage even at the edge of your current knowledge. Knowing how to respond when you do not know the answer in your viva ultimately means understanding that the viva is not a pass-fail memory test. It is an evaluation of your scholarly character — your honesty, your capacity for reasoned engagement, and your ability to operate at the boundary of what you know. All of these qualities are most visible precisely in the moments where an easy answer is not available.
