If the high frequency sound is within hearing range, you can hear it as a high-pitched sound. If it's out of the hearing range you can't hear it, of course.
No, high frequencies are heard as high pitched treble sounds.
high
Yes.
meh
Learn how to beat box - Lesson 3, Sounds - by Jaxs
How to Connect an HDTV to Your Sound System or Home Theater
How to Create a High Quality MP3 Using iTunes
Getting High with I-Dosing Auditory Stimulation