answering interview questions

I have associate degree in science, I am a optometric technician. I need to answer these interview questions for coming interview to get in sonography program. 

Need perfect and professional answers to pass this interview for getting in to this sonography program 

Question 1: what are two obstacles you have faced?  How did you overcome them? 

Question 2: where do you see yourself in 5-10 years?

Question 3: why should we choose you for this program of study (sonography program)?


Question 4: how do you handle difficult patient?

Question 5: how do you handle difficult coworkers at your job?