They normally differ in intonation. «Ти студент?» with a rising intonation would mean 'Are you a student?'. «Ти студент» with a falling intonation would mean "You are a student."
There's another way to form general questions: «Чи студент ти?» 'Are you a student?'. If you’re unsure in your ability to pronounce questions with a rising intonation (which shouldn't cause problems because questions in most European languages use rising intonation too), you can use it.