On the AsapScience Youtube Channel there is a simple hearing test with a little background on the subject.

[embedyt]https://www.youtube.com/watch?v=VxcbppCX6Rk[/embedyt]

For a fuller test look at the following series of videos

[embedyt]https://www.youtube.com/watch?v=qNf9nzvnd1k&list=UUc6XhPJQy-olOGzMR05vyzQ[/embedyt]