10 minutes isn't long at all. They will be looking for how you relate to the kids, manage their behaviour and if you are asking challenging/levelled questions.
Its difficult to give advice on what to do as its such broad area but go to TES forums, loads of great ideas on there.
A good way to always start with kids you have never met before is to get them to tell you the rules of their classroom so that they know that you know the expectations.
Ive recently left teaching after 14 yrs. Good luck!