A research question is a guiding focus for applying research. It is what you will use to inform a thesis, dissertation, hypothesis, etc. They are typically single-sentence questions that encapsulate what your paper, assignment, presentation etc. will cover and contain.
There are no specific way to propose a research question. What you will be writing about may affect the style and scope of your proposal. However, good research questions do have comment elements. When you're developing your research question, remember the acronym CARES:
Clarity: The question should be focused, concise, and have a clear statement of what the writer intends to do or answer.
Analysis: The question should be something that can be analyzed rather than simply described; no research question should have a yes or no answer or be a summary of facts.
Research: The question should be able to be researched adequately and using quality materials such as scholarly articles or academic books.
Ease: The question should not be too easy nor too difficult; consider the time, resources, and word allotment when deciding on your question.
Scope: The question should not be too broad nor too narrow; consider the time, resources, and word allotment when deciding on your question.