computer science 9th class book in English medium pdf

9th computer science book pdf-Hi dear students here you easily download computer science 9th class book in English medium PDF for free easily.

computer science 9th class book in English medium pdf


In the 9th Computer science book pdf, you learn the history of computers from start to now. You also learn computer basic and important components and other computer parts. After reading this book you are able to use the computer easily without any personal help.

Because in this computer book all computer basics defined perfectly.

If you really want to read this book then read all pages with details after downloading the computer science 9th class book in English medium pdf. I will explain all chapters in some important paragraphs taken from the book.

Here you also download the computer science 9th class book in Urdu medium pdf early we upload this book and give a link here.

9th computer science book Chapter short details

1-Introduction to Computers

Today, you can find computers almost everywhere. Microwave ovens, automobiles, thermostats, and even wristwatches contain computer chips. In fact, computers are so common in modern society that everyone is affected by computer technology to some extent.

The computer is an electronic device that processes data into useful information and saves it for late use.

Computers run programs according to the instruction written in the program the instruction run and different tasks process. Because a Computer program can evaluate data and then based on those evaluations, in the program.

Because a computer program can evaluate data and then based on those evaluations, results are generated which can be used for a large number of applications. Computers can process data with assistance.

Some examples for computer application are:
  • Controlling space flight
  • Landing airplanes
  • Tracking inventory
  • Printing books
  • Turning on lights at a specified time
  • Checking out groceries at the checkout counter
This chapter available in the computer science 9th class book in English pdf. Students read and explore the history of computers from start to now available technology. Also, the impact of computers on society will be discussed along with the introduction to programming languages.

2-Computer Components

A computer is an electronic device that accepts data and processes it into useful information for later use.

Computer process data according to the instruction written in different software. The sequence of instructions given to a computer for manipulating data is known as a program. Computers also include the means for strong data and the program on the internal memory.

The process of performing arithmetic and logic operations with the help of a computer is known as electronic data processing(EDP).
Two basic components of the computer are defined now.

1.Computer Hardware

  • Input Unit
  • Output Unit
  • System Unit

2.Computer Software

  • System Software
  • Application Software

3-Input/Output Devices

Input and output devices use to interact with the user. Users can enter data and instruction into the computer with the help of input devices. After processing the data computer send it to the output devices.

The input can be given in a variety of forms e.g. text, image, voice, etc. Similarly, the output may be required in different forms depending upon the user's requirements. That's why a number of different types of input-output devices are available.
They are some examples of input and output devices.
  • Input devices
  • Keyboard
  • Mouse
  • Microphone
  • Output Devices
  • Monitor
  • Printer
  • Speaker
Dear students if you interested and want to read these input-output devices details then download the computer science 9th class book in English medium pdf.

4-Storage Devices

Computers used to process complex and large data easily in seconds. Computers require some storage devices to store processed data. Such a device should be directly accessible to the CPU and its speed must be compatible with the speed of the CPU.

Based on the characteristics of the storage devices we classify these devices as Main Memory or secondary storage device. In this 9th computer science book chapter we will study the need and use of basic storage devices used in computers.

5- Number Systems

Data is defined as the collection of figures and facts, where after processing data called information.
Three types of data are as follow:
  • Numeric data
  • Alphabetic data
  • Alphanumeric data
If you want to read this chapter complete or want to get more information related to this chapter then download the computer science 9th class book pdf link given below to post end.

6-Boolean Algebra

Boolean algebra is the algebra of logic. It uses symbols to represent words. Boolean algebra was developed by the English mathematician George Boole in 1847.

The most important application of Boolean algebra is in digital logic. Computer chips are made up of transistors that are arranged in logical gates. Each gate performs a simple logical peroration.

The computer processes the logical preposition in its program by processing electrical pulses. The design of a particular circuit is based on a set of logical statements. The algebraic statements can then be simplified according to the ruled of algebra, and translated into a simpler circuit design.

Boolean algebra return results in terms of true or false i.e. 1 or 0 respectively. These paragraphs are taken from the computer science 9th class book in English pdf.

7-Computer Software

In previous chapters, we discussed different parts and configurations of the computer. It has been mentioned that programs or instructions are given to the computer to do a specific task. So it is necessary to provide a sequence of instructions so that your work can be done.

Software is a collection of programs that performs a different task. A computer is useless without software and vice versa. In this chapter, you will learn about different types of commonly used software and their functions. There are two types of software on the basis of functionality.

The application software is used to perform a specific task for a user.

The software used to control, monitor, or facilitate the use of the computer is called system software.

8-Introduction to Windows

Microsoft Windows(7,8,9,10 etc) is a family of operating systems for personal computers. Windows dominates the personal computer world, running almost om 90% of all personal computers.

The remaining 10% are mostly Macintosh computers and LINUX operating g system based machines. Windows provides virtual memory management, graphical user interface (GUI), multitasking, and support for many peripheral devices.

 This chapter will show you all the basics you need to get started. You'll get an overview of Windows features, and you'll learn how to use Help to get an answer to your questions and find out more about using windows operating systems. I hope dear you read all content and you really want to download the 9th Computer science book.

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Name Computer Science
Pages 154
Language English Medium
Size 32 MB

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