Any interviewers that ask these questions looking for any sort of detailed answer are probably not very good interviewers. It is ridiculous to ask applicants with no advanced medical training, complex questions that can only be answered with experience in medicine.
If the interviewer is good, they wont be looking for specific answers. They will be looking to see how well you can articulate an opinion and convey the depth at which you understand general concepts. Obviously, they are also looking for red flag responses that may signify psychological problems in the applicant.
1) Read about the similarities and differences and then decided which you think would be harder to practice, general medicine or a specialty. There is no right answer to this; you'll have to decide for yourself and hope you chose correctly if the interviewer actually cares what your specific response is.
2) Seems like this question is revolving around whether or not you would be able to break bad news with compassion and common sense. Specific conversations always depend on the patients age (there are different considerations between a 6 y/o and a 13 y/o).
-involve the parents.
-seek advice from colleagues / multidisciplinary team.
-put child in safe environment/setting.
-be firm, use concrete terms like "remove", "cut off" may be too gruesome.
-explain that you will always be there for the patient.
-explain to the child that they will be asleep for the process.
-answer any questions.
Hopefully, if you are asked these questions, they done so to assess your ability to show compassion and demonstrate the depth at which you have thought about the medical profession, and not in an effort to elicit specific responses.
-admissions committee interviewer / senior medical student