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No. it's not necessary to put a period after a question mark.
If your question starts with the words, 'who, why , what, when, where and how, your sentence will require a question mark
Use a question mark to create an interrogative sentence -- one that asks a question.
You use a question mark because it's a question. You are asking them how they are doing.
yes, most probably
You use a question mark (?) as the punctuation after the sentence or question you are asking.
It's just for style reasons to keep the writing look neat. One space is really sufficient.
A question mark is a punctuation mark, it replaces the use of a full stop at the end of a sentence that is asking a question.
A question mark "?" is a punctuation mark used to indicate a direct question in writing. It is typically placed at the end of a sentence to signal that the sentence is interrogative or inquisitive in nature.
You rarely use it in Analytical writing. In creative writing you use it to show excitement, anger, or generally an increase of emotion in your writing. Use it sparingly!
The backwards question mark symbol (؟) is called the Arabic question mark and is used in languages that are written from right to left, such as Arabic and Persian. It serves the same purpose as the regular question mark to indicate a question in writing.
No you should only use a question mark.