I'm not the person you are responding to. I don't recall every being asked about other nationalities. Countries will ask if you have previously entered under a

I'm not the person you are responding to. I don't recall every being asked about other nationalities. Countries will ask if you have previously entered under a different name but presumably you are using the same name world wide. If you have multiple passports you can just use whichever one gets you through immigration the fasted. some caveats: 1) if you have a passport from the country you are entering/leaving they want you to use it ie if you have a US passport you should use it when entering or leaving the US. If you then arrive in the UK and have a UK passport you should use your UK passport at the UK end of your flight. 2) if you entered a country with passport A use that same passport to leave. If you don't they wont automatically match up your entry and departure. On one hand you will have appeared to have overstayed your visa, on the other you are now exiting the country with no record of you having entered. At a minimum there will be questions and your just trying to just get through immigration painlessly.