Yes, the switch is limited to 126 v so should be ok for 6 v. Switches are also rated for maximum current so you need to be sure that it is not overloaded.
Sure
The phone will never charge.
No!
Sure you can. But consider what could happen if you did. If precision of time or speed was built into this 6-volt system, a 12-volt battery will make it work faster until something shorts or burns out. If you need more lasting power for the 6 volt system, you should consider putting two 6-volt batteries in parallel to power your 6-volt system.
A: YES the higher the number the better it is for conduction . But never the other way around
Sure
1954-1955
1956
No, it will overcharge the 6 volt battery.
Two six volt batteries in series makes 12 volts so switch the charger to the 12 volt position.
If you are talking about a 6 volt coil, yes, so long as the contacts are rated for the 230 volt circuit. If you are talking about 6 volt contacts, no, absolutely not.
USE INVERTER USE INVERTER USE INVERTER
Car Bomb
Nope.
No it will not work
Probably not much because 6 Volts is not enough to power a 12 Volt coil
Yes, it simply has less capacity.