Apple Firmware Engineer interview questions

I was contacted by a recruiter, pre-screened etc. After a couple of weeks the recruiter called and set up a phone interview with an Apple manager for the next day. A few minutes after the scheduled time I received a call from an Apple employee, not the manager. He asked me to describe my experience. I began describing my first job since some of the skills I acquired were relevant to the job at Apple. I was interrupted after 10 Sec. He asked if I knew how to program in C. I said yes, I have been writing firmware in C for several years. Then I started describing a firmware project I developed in C. After about 10 Sec. he interrupted me again, asking if I knew C++. I answered yes and that I also knew C#, and Python. I tried to continue with the description of the work I have done that is related to this job but was interrupted again, almost as soon as I began. This time he wanted to know if I knew Matlab. Neither Matlab nor C++ were mentioned in the job description. That concluded the first part of the interview. He asked me some basic questions about RTOS and version control programs. "What is a semaphore?" "What is a mutex?". Then the interview shifted to a website I could edit. There were several tricky puzzle book type problems. These do not test a person's ability to design or debug software. If someone had to solve them he/she would just write a short program or evaluate it with a script. But none were real world problems. And I doubt the interviewer would be able to solve them without himself. After that the interview ended. The interviewer was impersonal and didn't ask if I had any questions.