How did you react to it when any senior insulted or humiliated you?

Don't give any negative answer to this question,  you should know how to handle insults or avoid the situation rather then reacting badly. And same you need to show in your answer too.An insult is what other people think we are based on their perception of our acts and their own personal experience. Therefore it is not something that we actually are,  unless we believe it.So when someone insults you speak up for convictions,  but do it in a clam,  rational manner and stop taking things personally and same you can mention in your answer too.