1) Do children easily become the users of the computer? - общий вопрос
2) Children easily become the users of the computer, don't they? - разделительный вопрос
3) How do children become the users of the computer? - специальный вопрос
4) Who become easily the users of the computer? - вопрос к подлежащему
5) Do children or grown ups easily become the users of the computer? - вопрос с "или"