If you are in the process of interviewing for a summer internship, it's important to know what questions are legal or illegal for an employer to ask. The easiest way to decide if a question is legal or not is to think about the answer and its relevance to your ability to do the internship. Questions regarding your skills and accomplishments are definitely legal questions that an employer would want to know. On the other hand, questions about your age, health, religion, ethnicity, or sexual orientation have absolutely no relevance to how well you can do the job.
Most students have had very little experience interviewing. Consequently, they may not know that employers sometimes ask questions that are illegal. One of the key things to keep in mind when answering interviewing questions is how to keep your answers relevant to show you have the knowledge, skills, and experience in order to do a good job.
Upon interviewing you may decide that the internship is not the right one for you. It may be the interviewer or the environment that makes you uncomfortable but it's important to understand why you're feeling the way you are and that you may have to turn down an offer if the employer decides to extend one.