Yes, but they will not be as bright as they would be with the correct voltage.
Not on any modern car with a 12 volt system.
No, the battery is DC not AC.
If you are interested in getting a 12 volt battery for your car you should go to your local car workshop in your nearest City. They can help you getting a new battery.
No, not unless you installed a 6 volt battery instead of a 12 volt battery.
12 volt
One is 9 volts and the other is 12 volts. They do not interchange!
It is a 12 volt battery. Fully charged it will read 12.6 volts with a digital volt meter.
The charger needs to be set to charge for the voltage that the battery is designed to produce. Most car batteries are 12 volt batteries.
12 volts nominal. A 12 volt car lead-acid battery will measure about 12.2 at full charge and no load. Car charging systems usually keep the voltage around 14 when the car is running, though it might drop down if accessories are in use (lights, heater fan, wipers).
It will be a 12 volt battery.
No, a lead acid battery is a wet cell battery and a 9 volt alkaline battery is a dry cell battery.
When your lights are on and your engine is not running you are taking the power for your car lights directly from your battery. If you leave them on long enough, you will run down your battery and your car will not start. Then you will need a jump.