Yes. A play is a major work, like a novel, so the title should be underlined, unless the play is a fairly short work, such as a one scene long tribute to another work. This would be too short to be considered a major play, so the title would be put in quotes. A play such as Shakespeare's Othello would be underlined or italicized, due to its length.
underline it
No.
You don't have to but I guess it would be better if you do.
Qutation marks for essays, short stories, poems, movies underline for book titles
No, it is no necessary to underline proper nouns in a regular or formative essay, unless used to exaggerate.
Either underline or italicize.
underline the name of a magazine but quote the names of the articles.
No, you would italicize the name "Netflix" when writing it in a formal document or publication.
No. even if it is the name of a symphony, you still don't
No you can italisize it.
underline it
No. A film title should be set in title case, for example, The Wizard of Oz. If you are being thorough, then set the name in italics, for example, The Wizard of Oz.
Yes you do. You also underline names of books, and websites.
Yes, you should always underline the name of something, except the names of people.
When you are writing about a tv show you do not underline TV show. You underline the official name for the tv show. You have to know the exact name for the show. TV show does not have to be underlined because its not proper like the real name. If I was writing about Jerry Springer i wouldn't underline "The TV show I am watching" I would undreline the show I am watching is called Jerry Springer.
That would not be the normal usage. The name is capitalized.
No, it is not necessary to underline a scientific name even if it is completely written in capital letters. The proper format for writing a scientific name is to italicize it or underline it to indicate that it is a Latinized binomial name.