The CO asked basic questions based on the information submitted on the DS260.
1 - work history (basic questions about previous positions my wife and I held in the past)
2 - In what field do my wife and I intend to work in the United States
3 - where in the US do we plan to settle
4 - Have my wife and I ever been arrested anywhere in the world?
5 - how long was the longest stay we've had in the US
6 - have I and my wife ever overstayed our stay in the US
7 - what is my highest level of education
8 - asked for confirmation of basic information such as the wedding date, if I had been married before, if I have other children other than those listed in the DS260.
Note:
1 - although the employee who collected our documents asked for information about our finances, and I did submit, the CO did not ask about my finances.
2 - our medical exams were electronically sent to the consulate and the CO had this information in hand; however, he didn't go through that. I assume he was satisfied with the results.
3 - at the end of the interview, he told us that he will recommend the approval of our visa. He gave us an information sheet on how to track the shipment of our passports.
4 - I asked him about the green card activation fee, and he told me that the fee must be paid at the border. I'm not sure if further instructions on how to pay the fee before departure will be sent with the passports.