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.
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.
Depends what visa and what country
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?