I took the language test for the FBI, and I'm sure it will be the same. You sit in a room by yourself and take the test over the phone. It lasts about an hour, and no specific questions are asked. You take the test over the phone with two native speaking individuals in whatever language you're testing. You start off with basic information about yourself (your background, what you like to do, etc.), and then transition in to conversation about politics, etc. There is no specific question that is asked, it's just a long conversation to test you in all tenses of a language in a variety of settings.