10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 31, 41, 51, 61, 71, 81, 91 = 19 (1s)
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300 times.
As a digit in other numbers it appears 20 times
Infinitely many.
Zero. Only the digits 5 and 0 appear in 500.
There will be unlimited 0's between 1 and 10000 because you also need to count the 0's, such as 1.01, 5934.00000000000004.... etc. Well, there could be an actual number of the digit 0 appear between 1 and 10000, but that number will be so much times larger than a google.