It probably differs from canton to canton, but at our police interview, they first wanted the names and addresses of all our immediate family. I presume they wanted to be sure we weren't applying for naturalisation in order to bring our families over. The second part was a 10 question quiz on Swiss geography, politics etc, where we were questioned separately; I got 9/10, my wife 10/10
. They weren't interested in motivations etc; that came at the commune and canton interviews.