Yes
Class b
No, a UK visa is only valid for the UK. You need a "Schengen visa" for Switzerland.
Yes. A UK visa is not a valid Dubai visa
No need for a visa, as the UK is a participant in the Visa Waiver Program.
No A UK visa is only valid for the UK. For most European countries, if you need a visa it will be a so-called 'Schengen visa', which is valid for 29 countries. But the UK is not a member of Schengen.
I once traveled to Switzerland on my UK visa.
No. Northern Ireland is part of the UK, so the visa will cover it.
You can establish your own business in the UK if you have the UK work visa.
In the UK, Cannabis has recently been reclassified back to Class B from Class C.
If you can get an American passport, it could happen.
Tier 1 dependent visa's are visa's for family members to stay in or come to the UK. The person they are applying under must have a post-study worker visa in the UK.