Frequently asked OS Questions-I

I will share Links to study frequently asked OS terms in this post.You should have at least little knowledge of these terms before going for the interview.
No need to study the whole post in each link :P

http://en.wikipedia.org/wiki/Modem
http://en.wikipedia.org/wiki/Instruction_%28computer_science%29
http://en.wikipedia.org/wiki/Bus_%28computing%29
http://en.wikipedia.org/wiki/Computer_architecture
http://en.wikipedia.org/wiki/Polling_%28computer_science%29
http://en.wikipedia.org/wiki/Run_queue
http://en.wikipedia.org/wiki/Jitter