I have some questions about PhDs.?

1. No, you're just Dr. X no matter how many PhDs you earn.

2. I'd think the independent research and writing and defending your thesis/dissertation. Most make it through the graduate course work just fine. Many universities don't even have masters programs in certain fields, so getting a masters degree means you made it through your PhD coursework but failed to complete or successfully defend your thesis.

3. Neither; just get a doctorate in one subject, unless it's a related field (like an MD with a PhD in virology). You're never going to work as a physicist/psychologist. Unless you're a physics and psychology double major at the bachelors level, you're most likely not even going to qualify for a graduate program in both fields. And most undergrads struggle enough already with getting good grades as a physics major, without adding in a whole other major on top of it.

4. Psychologist. Physicist jobs are mainly academic, whereas you can become a treating psychologist with a PhD (in addition to the academic jobs).

5. Too many to mention.

While on TV having two PhDs means someone is 'extra smart' that's not how it works in real life. In real life, you'd need to double major in both of those fields to get into either grad programs, and each PhD (they must be done separately) is 4-10 years of grad school (including masters work, required for each PhD). Most schools will not even consider admitting you for a second PhD. You can't work in both fields at once, so doing a second PhD means you're throwing away the last 4-10 years worth of work, wasting your time and theirs. It doesn't make you look smart, it makes you look flaky.

1. No.

2. The 4-10 years of high level classes, qualifying exams, coming up with original ideas and ways to test them, seeing years worth of work invalidated because your experiment didn't work, someone scooped you, or you made a mistake, and having to start over from the beginning, getting your work published, defending it to your peers at conferences and your PhD defense, and getting a job.

3. Neither. Pick one field, and you'll do the masters and PhD work in that one alone. Forget about two.

4. Physics.

5. Those are both majors most schools offer; you can start anywhere. You'll do your PhD somewhere else, and it's the PhD institution that matters.

It is impractical two get two PhD s as this could end up being as much as 20 years in college. You would still only use one "Dr.". A PhD shows competency in research. Physics would be the better degree. You have to start with a bachelors degree and almost all colleges have degrees in these fields. The hardest part of the PhD degree is the dissertation. This is basically a book you write that must have significant original research. You have to get a committee of professors to approve it and a significant number of students never get it approved.