Those were control questions. Generally, what the polygraph interrogator will do is manipulate you into lying on certain questions that he is not trying to find out the truth on. He will assume you are lying on those questions (even though you may not). He will generally explain how the police department takes lying very seriously, how it is very serious offense. Then he will turn around and manipulate you into lying on questions that he is not trying to find out the truth on. He will then ask questions that he is trying to find out the truth on, compare the physiological responses to the questions that he assumes you are lying on and if the physlogical responses that he is trying to find out if you are lying on or not is higher than the one he assumes you are lying on, you will be deemed "deceptive" and be subjected to an unpleasant interrogation.
Another piece of advice I have for you is this. If you get in the car with a cop and he gives you a speech, "What goes on in the car stays in the car." Tell him BS, what goes on in the car does not stay in the car. If it does, and the truth later comes out that you were lying to cover for another cop, you will go down on the same criminal charges as him. What goes on in the car doesn't stay in the car. Understand, that if you refuse to surrender your integrity, you could become the target of other cops or be considered "a rat." Just do the right thing, protect the innocent, don't trust the system you serve and be wary of other cops who might be crooked. Never surrender your integrity and be prepared to constantly have your life and character on the line and tested to the limit.