Operating System - Functions

Software can be broadly classified into three categories: System Software, Application Software and Firmware. System Software is a set of one or more programs, designed to control the operation of a computer system. Application software is a set of one or more programs, designed to carry out operations for a specified application. Firmware is the combination of software and hardware. The various functions of operating system are: Program execution, handling input / output operation, manipulation of file system, error detection and handling, resource allocation, accounting, information and resource protection and maintaining the internal time clock.

Operating system supervises the various resources of computer. Management function is categorized into two ways: hardware management and software management. Hardware management is further categorised into processor management, memory management and I/O management. Software management is further categorised into File management, Software tools management and Data Security. Operating system is designed to manage the various resources and overall operations of a computer system. Operating System can be classified into two categories: Single User Operating System and Multi User Operating System. A single user operating system has a single CPU and one set of /O devices. Multi User operating system allows more than one user and each user works on a different set of programs and data.

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  • Q1

    a) What is a File?
    b) What is a Directory?

    Marks:2
    Answer:

    a) A file is a collection of logically related information.
    b) Directories let you group your files in convenient categories.

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  • Q2

    Where are sub directories or additional directory created ?

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    Answer:

    The sub directories and the additional directories created in the root directory.

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  • Q3

    What is Root directory ?

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    Answer:

    The first level in a multilevel directory system is the root directory. It is created automatically at the time of formatting a disk.

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  • Q4

    What do you mean by system software? How is it different from application software?

    Marks:2
    Answer:

    System Software is used to control and manage computer devices and operations. It is used to run the computer hardware. It is divided into two categories: Operating System and Language Processor.

    Application Software is the set of programs necessary to carry out operations for a specified application. Unlike system software, this type of software pertains to one specific application. For instance, software that can perform railway reservation functions cannot prepare result for a school. It is divided into Packages, Utilities and Customized Software.

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  • Q5

    Name the program that acts as an interface between user and hardware.

    Marks:2
    Answer:

    An Operating System is a program, which acts as an interface between a user and the hardware. An operating system is an important component of a computer system which controls all other components of computer system.

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