If you car battery is completely dead will a jump make it start again.
If it's the battery and not the alternator then yes you can jump start the vehicle and it will run. However you will have to jump it each time you start it until you replace the battery. If it's the alternator then no it will not stay running.
No. It has a bad cell and it is time to buy a new one.
it depends on what you mean by completely dead.
Take battery to auto parts store they will check it for free. If there isn't a dead cell you should be able to jump but you have to leave it hooked up awhile for it to work.
Yes you can also pop start it