Yes! U Can!
No, you need to apply Canada visitor visa~
yes
Are you seeking a visitor visa for the UK?
Yes, you can apply for a Canada visitor visa from the USA.
Do you intend to apply for a family visitor visa to the UK?
Of course not. You cannot work in Singapore with a visitor's visa. This would be illegal. You have to apply for a Singapore work visa.
Depends what visa and what country
Yes, a return ticket is typically required for a US visitor visa to show that the visitor plans to leave the country before their visa expires.
No US citizen does. No legal resident does. Only non-resident aliens on student visa, tourist visa, or visitor visa need work permits.
It is extremely difficult to convert from a visitors visa to any other kind of visa. The best situation would be to apply for a dependent on your student visa and then your wife can accompany you. www.bia.gov.uk should answer some questions.
Yes, Indian parents can apply for a visitor visa to the USA.
Do you have the required consulate letter for your visitor visa application?