Northern Ireland is part of the UK so your UK visa is valid.
No.No.No.No.No.No.No.No.No.No.No.
As Northern Ireland is still part of the UK; the same rules will apply.
It depends on where you are coming from As Northern Ireland is part of the UK you will need the same Visa that you would need to enter any other part of the UK. If you are a UK citizen you do not need one
Yes South African passport holders require a visa. You cannot get an Electronic Travel Authority (ETA). You must apply in person at your nearest embassy.
Yes, as a Ugandan citizen, you will need a tourist visa to enter Northern Ireland. The UK requires visitors from many countries, including Uganda, to obtain a visa prior to travel. It's advisable to check the official UK government website for the most current visa requirements and application procedures.
yes there are no borders between northern and southern ireland
With a UK visa, you can travel to the United Kingdom, which includes England, Scotland, Wales, and Northern Ireland.
Yes.
No
No, Serbian citizens doesn't need visa for Schengen countries, but they need visa for UK and Ireland.
Yes, the visa allows free travel in the entire United Kingdom (the UK) of Great Britain and Northern Ireland territory.