If you're referring to "The" emergency room rather than "An" emergency room, you can consider it a proper noun and capitalize it. In general it is not capitalized.
No, "management class" is not capitalized in a sentence unless it is part of a title or at the beginning of a sentence.
No, not unless you use ER which is short for emergency room.
Ummm.... No it depends on how you use it in a sentence.
You should capitalize "Management Office" if it refers to a specific entity or official title, such as "the Management Office of the University." However, if you're using it in a general sense, such as "the management office is located on the second floor," then you do not capitalize it. Always consider the context to determine the appropriate usage.
You do not capitalize chickenpox in a sentence. The exception is if the word is the first in the sentence.
No, you do not capitalize "first birthday" in a sentence.
You only capitalize 'deceased' if it is at the start of a sentence.
Yes, you should capitalize the letter after a comma in a sentence.
Yes, you should capitalize the word after a comma in a sentence.
an injured person should be immobilized until emergency medical personnel can evaluate the injuries
Yes, you always capitalize a day of the week.