NO
If you have a 3G iPad, you will need a SIM card in every country. Wi-Fi only iPads don't have a sim card slot.
Only the iPad Wifi + 3G Model needs a Sim.
I have an ipad 3g and it has a Sim card, i don't know if it is a micro sim, it looks just like the Sim cardd in an iphone. There are two kinds of ipad and the ipad 3g does have one and the ipad wifi does not.
If you have the Cellular model and have inserted a sim-card, then yes you will (assuming you have 3G where you are) connect to the internet.
This depends. First off, it would need to be an AT&T model, as Verizon models do not use a SIM card. Also, it depends on the UK carrier. Most would be compatible with AT&T's network, so yes, you should be able to use a US iPad 2 with a UK SIM. Although, take note that the iPad uses a microSIM, so the UK SIM card will have to be cut down to fit into the iPad.
S h i t
depends on which model but most of them does.
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There is only a SIM card slot in the 3G and 4G LTE iPads. The WiFi only models don't have a mobile radio, so a SIM slot would be useless.
No. A sim card holds data for its self. On the other hand wi-fi holds data for its self. Meaning excess fees of a sim cards data is not possible unless the sim card is in the phone, ipad, tablet etc..
No. There's an iPad WiFi and an iPad WiFi + Cellular. The iPad WiFi will only be able to access the internet when you're within range of a WiFi network. The iPad WiFi + Cellular is able to access the internet within range of WiFi and on a 3G network. To access the 3G network you will however have to use an active simcard.