Present perfect questions

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. Where have you been?
  2. What have you been doing?
  3. Why have you come to this class?
  4. When have I got to arrive?
  5. Where have they been on holiday?
  6. Why haven’t you tidied up?
    Are all these present perfect questions correct?
2

They are though they may not always be the best tense to choose, especially number 4.