As long as primary h1 B Holder has valid I-797 should not be an issue
A single-entry Kenya visa is valid for three months. It must be activated within six months of the date of issue. The multiple-entry visa to Kenya is valid for twelve months from the date of issue but the total period of stay in the country cannot exceed three months. It is only issued to UK passport holders. I found this at: http://www.visafirst.com/en/kenyan_business_and_tourist_visas_faq.asp#faq1 :)
An immigrant Visa is usually valid for 6 months.
One year.
Typically the visa is valid for 10years but it's at the discretion of the officers. I've seen medical visas for as little as 6mts
For as long as your visa is valid, unless you hold German citizenship.
Yes. A UK visa is not a valid Dubai visa
One year.
Each country will be different so this depends. In Canada your tourist visa would still be valid.
A single-entry visa for Ghana generally must be used within three months of the date of issue.
Yes if you do not have any valid US Visa. No if you have a valid US Visa.
No, a UK visa is only valid for the UK. You need a "Schengen visa" for Switzerland.