Describing the viva’s conversation and questions isn’t as simple as picking an extreme.
Questions can be tricky because of the standard of the work being talked about. Responding could be trivial because of the work that you, as a postgraduate researcher, have put into your thesis.
A comment might be simple, easy-to-understand, and in the moment you might find yourself lost for words.
It’s not sensible to focus on how much of one kind of question or another one might get. Instead, you can focus on being prepared.
Read your thesis and practise for the viva. Refresh your memory so that you’re as comfortable as possible talking about your work. Understand that you can’t know every question that is going to be asked, but you can prepare yourself to listen, pause, think and respond.
The viva isn’t trivial, but nor is it so tricky that you have to worry. Get ready to engage with whatever your examiners bring to the discussion.