The Agent first took my civic test then asked a couple of questions regarding my marriage after that she called my spouse in to ask the same questions like the wedding date,what is your spouse's DOB & what does she do . Just the general questions.
Tip: If your I-175 is pending then make sure to take all the prints out with you even the hard copy of pics, a copy of joint bank account or any other documents you & your spouse have their names printed on them. I forgot to take the pics with me but case was approved . Just be confident. Say yes or No .Don't give extra information .
Best of Luck.