Sure. Make 1-page summaries of your chapters, think about what contribution your thesis makes to knowledge (preferably along the lines of "it makes x number of contributions; these are...etc."), read your entire thesis through from start to finish twice - and properly, not skim-reading. And if you don't know an answer to a question don't try to fumble through it, simply say you can't answer. But the questions tend to be relatively general; they don't "pick fault" with a thesis unless it's very poorly written.