No.
Yes. It is universal currency for those nations.
The 1 million Euro banknote exists but it can't be traded or converted
Mostly Euro coins as the Euro is the local currency, however any coin from any country can be thrown in.
A euro is a coin used in the Eurozone within the European Union. It is used like any currency.
No. It is pretty much impossible for any Euro country to revert to its own national currency for legal, contractual and practical reasons.
According to Russian law, the calculations are made only in rubles on the territory of the Russian Federation . But there are of course exceptions. Payments in Euro may be made between individuals (natural persons) or when you buying something on the markets....
No. You must exchange it in any of the banks into the Thai Baht's before using it there.
There is no such currency any more - the Drachma was replaced by the Euro in 2001 !
The currency of the Netherlands is known as the Euro (EUR), which replaced the Dutch guilder in 2002. However, prior to the Euro, the currency was called the Dutch guilder (NLG). The term "Holland dollar" does not refer to any official currency; it may be a confusion with the guilder or a colloquial reference.
It makes it easier for countries to do buiness with each other, as there is no need to do any currency conversions.
There is no way to determine one currency's exchange rate. To find out what is the value of one currncy it has to be compare to another currency. For example, you can check what is the exchange rate of the Cyprus currency (EUR) in comparison the US Dollar (USD). Currently the EUR/USD is worth 1.266
Yes, the Euro is a common currency throughout most of Europe, any country that uses the Euro will accept Euros from any other country that uses the Euro. There is no exchange rate, all Euros are the same value.