A separate one for each job when no dependents are claimed.
Not unless you have two social security numbers. ;-)
The payments from the two jobs will be added together. You will have 2 W-2 forms (or 1099 forms) but the amounts will be totaled on your tax form.
Of course not. You file an income tax per individual (or married couple), not per job.
This is tax fraud.
No, you must declare all of your income on one return.
Why would you want to?
It can’t imagine why. You wouldn’t be able to qualify for the medical deductions, or the social security cut-off amount if you don’t combine all your income.
All your income is combined to make one total.
Unless you have a twin brother, you file all combined income together.