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Bar-code readers use ____that sweep a narrow beam back and forth across the bar code.

The number of refresh cycles per second is normally stated in hertz and called the ____.

____ occurs when memory partitions allocated to a single process or purpose are scattered throughout physical memory.

____ store information about page locations, allocated page frames, and secondary storage space.

Touch position sensing in a touch screen is usually based on ____.

A blocked thread is waiting for an event to occur, such as allocation of a requested resource or correction of an error condition.

​OS ____________________ functions ensure that overall system objectives are achieved efficiently and effectively.

After ____________________, all free partitions form a contiguous block in upper memory.

A(n) ____________________ is a unit of executing software that’s managed independently by the OS and can request and receive hardware resources and OS services.

A reference to a page held in secondary storage is called a(n) ____________________.