# Computer Science

## Punjab Computer Science Online 9th Class Test Lesson 8 Introduction to Windows

The Chapter 8th (Introduction to Windows) is about Computer Operating system windows.The study of the theoretical foundations of information and computation, and of practical techniques for their implementation and application in computer systems. It is frequently described as the systematic study of algorithmic processes that describe and transform information. Its providing us many options and facilitating us with its latest …

## Punjab Computer Science Online 9th Class Test Lesson 7 Computer Software

In the Chapter no 7 (Computer Software) you have read about the Computer Software that what is the Computer Software. Computer Software is the collection of Computer programs That perform a particular task. In other words you can say “written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored …

## Punjab Computer Science Online 9th Class Test Lesson 6 Boolean Algebra

In this chapter you had read about the Algebra’s new form “Boolean Algebra”. The Boolean Algebra is the Algebra of Logic. Boolean Algebra uses symbol to represent logical statements instead of words. a system of symbolic logic devised by George Boole, it used in computers. In other words, Study of mathematical operations performed on certain variables (called binary variables) that …

## Punjab Computer Science Online 9th Class Test Lesson 5 Number System

What is the Number System, and where we use it and why. You had read very deep about it in the Computer Science subject of 9th Class and here you should appear in the Online Test about this chapter and check your preparation for your examination. A number is a mathematical object used to count, label, and measure. There are …

## Punjab Computer Science Online 9th Class Test Lesson 4 Storage Devices

You had read in this chapter about the Storage devices of Computer, that what is Storage Devices? A piece of computer equipment on which information can be stored that called Storage device of Computer. A storage device may hold information, process information, or both. A device that only holds information is a recording medium.Storage devices are hardware devices that are …

## Punjab Computer Science Online 9th Class Test Lesson 3 Input output Devices

In the Subject, Computer Science of 9th Class “Input Output Devices”  provided the deep information about the all input Device and Output devices of Computer, Because computer have many Input and Output Devices like Monitor, Mouse, Keyboard, Speaker, CD Drive, Printer and ETC. Input Device: An input device is any piece of computer hardware equipment that used to provide data …