When I interviewed at Google for a Ads Solutions Engineer, I had some of these questions asked as well. (I got an 8/10 and was pushed to the next round).
I assume they have a massive list of questions (for various positions and have a minimum cut off - 7/10 I'm assuming as a few of my friends who got 6/10 and were not moved forward) and are asked to all applicants without consideration of experience/skill/previous work as well explained by Max Howell[0]).
[0] https://twitter.com/mxcl/status/608682016205344768?lang=en