any & every question related to your relationship with your spouse, just to figure out whether its genuine or not.
perhaps what does your spouse do, when exactly you guys met, have you been on a honeymoon, if yes where, a MUST thing is to read your file again a few times before you go for interview because your should know exact dates & relationship history on your application, there can NOT be any contradictions. he might pick up a pick of your spouses relatives and ask you who is in this pic just to see whether you actually know each others well enough.
hope this helps.