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9.	What are the types of operating system available?
	The various operating systems are Single user operating system Multi user operating system Time sharing operating system Virtual storage operating system Real time operating system Multiprocessing operating system Virtual machine operating system

10.	What are the categories of operating system?
	The operating system categorized into the following Control program Service program

11.	Define Operating system?
	An operating system is a set of programs, which are used to control and coordinate the computer system.

12.	What is meant by BIT?
	A Bit is a Binary Digit.