10 minute presentation for a PhD interview
They want to see one element of your research accomplishments rather than a full explanation of everything you've ever done. If you have extensive, varied research experience (or, perhaps, if you just like to ponder the details of each project) then this can seem daunting. It's unlikely that you can present every detail of every method and its applications in ten minutes, though, so you'll need to choose one project or result and keep the details to a minimum.

The skills needed to complete a PhD aren't limited to those learned in the course of doing the research, but also planning projects, adapting methods to your own purposes, interpreting your findings, presenting them, and even general skills like working on a team or knowing when a project has become too complicated. Even the presentation itself is a demonstration of your communication skills. Choose an element of your previous experience with the best examples of these skills and how you've developed them.