A quarter
25 cents
The answer depends on what part of the world the question is about. The Eurozone has a 20 cent coin but not a 25 cent coin. The US, which is smaller, has a 25 cent coin but not a 20.
No there is not and there cannot be. There are a number of countries which use a dollar as its major currency unit. Among these are Australia and the US. Australia has a 20 cent coin but not a 25 cent coin whereas the US has a 25 cent coin but not a 20 cent coin. Also the smallest Australian coin is a 5 cent coin. The number of ways of making change for a dollar in Australia and US will, therefore, be different.
A US 5-cent coin is 75% copper and 25% nickel.
A "quarter" is the slang name for a 25-cent coin in both the US and Canada, because 25 cents is one-fourth of a dollar.
the nickel.
dime
If it was found in change, the coin is face value. A uncirculated coin is about 25 cents.
A two cent US coin is larger in size than a ten cent US coin.
...Of what US coin? There have been several US coins intended for circulation ranging from half a cent to $20.
It is not possible to answer the question. Many countries or regions use cents as a minor currency unit but they have different coinage. For example, the US has a 25 cent coin but not a 20 cent coin. The Eurozone has a 20 cent coin but not a 25 cent coin. You have not specified what country or region the question refers to.
The answer depends on the country or region that you are referring to. For example, the US has a 25 cent coin but not a 20 cent coin. The Eurozone, on the other hand, has a 20 cent coin but not a 25. And since you have not bothered to clarify the region, I cannot provide a more useful answer.