The particle か at the end of a sentence turns that sentence into a question.
Are you American, Mr. Brown?
Also note that while the word “you” is used often in English, In Japanese the equivalent phrase is the listener’s name followed by さん.
A simple sentence that has been converted into a question by adding か simply asks if the information presented is correct or not.
Are you a student Mr. White？
Yes, I’m a student.
No, I’m not student.
Questions asking for information
If a question includes a question word such as どなた (who), the answer should follow the same pattern as the question, with the question word swapped for the required information.
Who is that?