If it is a dual voltage TV, yes.
Yes, no problem.
Do not do this.
No.
It is certainly unsafe.
No. Attempting to run an appliance on insufficient voltage can cause damage to the appliance and can be dangerous. Call an electrician and get him to install a 220v plug
This is a highly unlikely scenario due to the fact that 120 volt and 240 volt receptacles have different pin configurations. The TV 120 volt plug end (cap) would have to be cut off and then a 240 volt cap put in its place. The money spent just to ruin a TV seem a little out of place.
Is the 220V plug 220V only or 110/220V? (The former will have 3 prongs and the former will have 4) If your case is the latter just use the ground, neutral, and one of the hots. This will give you 120V single phase. If the case is the former you can't get 110V off that plug.
100/220 = .45A or 450 mA
Only if it is rated for 110V-220V. If it is rated for 110V only and you plug it into a 220V outlet, your device will be destroyed.
Yes, you can. UK and Germany use both the PAL TV system and use Region 2 DVDs. The only thing you will need is a 3-pin (UK) to 2-pin plug adapter for the 220v mains.
Round 2-pin; 220V AC
No. the plug configuration is different, just for that reason so that the two voltages can not be crossed over.