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I think most examiners will ask challenging questions, not necessarily because they fundamentally
disagree, they may do in some cases, but usually because
they want to hear the candidate defend and justify what they have done.
I think that's an important part of the viva process. In some countries it's actually called
"a defence" because the candidate is defending what they have done,
and I want to hear the candidate put a strong, clear case for why they've done what they've
done. There are cases of course when the challenging
question might be a challenge because there is actually an error or a misunderstanding
of what's been done and I think that's a slightly more tricky
issue to deal with, but it's worth remembering that a thesis isn't a perfect piece of work,
there may well be the odd error in it here and there, and if you get the sense that actually,
from the way your examinar is questioning you
they've spotted a mistake, don't keep defending to the death, as it were.
Be prepared to hold your hands up and: "O.k, maybe I did make a mistake".
We've all been there, we've all done it, and most examiners will understand it.
But if you get to the point where you can't continue to justify something, be prepared
to admit it.