Yes upper and lower case letters can simultaneously be used as password features.
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Uppercase is capital letters. For example: A B C D E F G Lowercase is letters that are not capitalised. For example: a b c d e f g "No" is probably the abbreviation for "number".
THESE LETTERS ARE IN UPPERCASE. these letters are in lowercase. These Letters Are in Upper and Lower Case.
The latin alphabet for English has 52 letters, if you count both upper case and lower case. Otherwise, there no other alphabet with 52 letters.
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No particular reason. It is simply a convention with no rationale.