Which 3 question Allah will ask after we dies?

one of them is:

who is your Imam?

a famous hadith of prophet Muhammad (PBUH) says:

من مات و لم يعرف امام زمانه مات ميته جاهليه

who die and do not know Imam of his time has died death of Jaheliye (the time before prophet that people did not have Islam)