No, the word 'emperor' is a common noun unless used for a specific emperor, for example Emperor Hirohito or Emperor Tiberius.
The word evolution does not need to be capitalized.
No, coral does not need to be capitalized.
No, circa does not need to be capitalized.
No, it doesn't need to be capitalized.
No, kinetic energy doesn't need to be capitalized.
Yes, "Her Majesty" should be capitalized when referring to a queen or empress. It is considered a title of respect and should be capitalized as a sign of formal recognition.
Proper nouns name specific things and are almost always capitalized, so Empress Josephine is a proper noun.
No, coral does not need to be capitalized.
The word evolution does not need to be capitalized.
No, it doesn't need to be capitalized.
No, it shouldn't be capitalized.
No, circa does not need to be capitalized.
No, kinetic energy doesn't need to be capitalized.
No. Queries do not need to be capitalized.
it does not need to be capitilized.
Yes, acronyms are typically capitalized.
No, the word "revivalist" does not need to be capitalized unless it is at the beginning of a sentence or part of a proper noun.