Computer

Notes for Computer Science class IX, 9th Class COMPUTER NOTES, Complete Notes Of All Subjects, free notes class 9, 9th Class Computer Notes,Ix Class Computer Notes

Chapter 1 Introduction to Computers

Last Updated Saturday, November 24, 2012Chapter 1 Introduction to Computers       Computer A Computer is an automatic electronic, calculating device which can process a given input in a prescribed manner to produce a desired output, at a very high speed with remarkable accuracy. It can also perform all arithmetic and logical functions according to instructions given in a …

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Chapter 2 Data Processing

Last Updated Saturday, November 24, 2012Chapter 2 Data Processing   Data Processing Data processing often referred as D.P is a process of collecting the data together and converting the data into information. The method used for collecting the data may be manual, mechanical or electronic. Data processing is a term mostly associated with business and commercial work. Since computers are …

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Chapter 3 Input and Output Devices

Last Updated Saturday, November 24, 2012Chapter 3 Input and Output Devices   PRINTER A computer peripheral that puts text or a computer generated image on paper or on another medium, such as a transparency. Printer can be categorized in several ways the most common distinction is IMPACT and NON-IMPACT. IMPACT PRINTING Is the method used by the conventional type writers. …

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Chapter 4 Programming and Basics

Last Updated Saturday, November 24, 2012Chapter 4 Programming and Basics   LOOP While writing a program it is necessary to repeat a part of a program for a number of times. The best solution for this is to use a loop it is a method which executes a part of the program repeatedly as specified by the programmer. TYPES OF …

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Chapter 5 Computer Components

Last Updated Saturday, November 24, 2012Chapter 5 Computer Components     Central Processing Unit – CPU The central processing unit (CPU), also called the microprocessor, the processor or central processor is the brains of the computer. The CPU is housed on a tiny silicon chip. This chip contains millions of switches and pathways that help your computer make important decisions. …

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Chapter 6 Storage Devices

Last Updated Saturday, November 24, 2012Chapter 6 Storage Devices     Primary Storage Devices The names of some computer’s primary storage devices are as follows: 1. Random Access Memory (RAM) DRAM SRAM 2. Read Only Memory (ROM) EPROM PROM 3. Memory 4. Cache Memory Secondary Storage Devices 1. Hard Disk 2. Floppy Disk 3. CD-ROM (Compact Disc Read only Memory) …

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Chapter 7 Data Representation

Last Updated Saturday, November 24, 2012Chapter 7 Data Representation     Data The word data is derived from Latin language. It is plural of Datum (But Data is usually used as a singular term.) Datum (singular) – Data (plural). Data is any collection of facts of figures. The data is the raw material to be processed by a computer. Example …

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Chapter 8 Boolean Algebra

Last Updated Saturday, November 24, 2012Chapter 8 Boolean Algebra     Boolean Algebra The Boolean algebra was developed by the English mathematician George Boole; it deals with statements in mathematical logic, and puts them in the form of algebraic equations. The Boolean algebra was further developed by the modern American mathematician Claude Shannon, in order to apply it to computers. …

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Chapter 9 Computer Software

Last Updated Saturday, November 24, 2012Chapter 9 Computer Software       Machine Language Machine language is the only language that a compute understands directly without any translation, it is the binary language. It is the language of 0’s and 1’s . It consists of strings of binary numbers. The binary codes are very difficult to memorize for human beings …

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Chapter 10 Introduction to Windows Operating System

Last Updated Saturday, November 24, 2012Chapter 10 Introduction to Windows Operating System     Windows Desktop Windows “Desktop” is like a working surface of a desk. Desktop is where your applications, folders and shortcuts are located. Desktop contains the following items. 1. Icons 2. Taskbar 3. Start Button The function of these desktop items is given below: 1. Icon An …

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