9TH Class Computer Notes

Key Notes of Computer for Class 9. These notes will provide you overview of the chapters and important points to remember. Help in quick revision before test.

### HOW APP WORKS ###

Each question has four options. You have to select one of them. If you do not know answer of question, you can also check the answer by simple tap on a button to show answer. At the end of test, you are presented with a screen which contains result of the test. It tells how many questions you answered correctly and how many questions you answered incorrectly.

### TOPIC COVERED ###

# Introduction to Computers

What is Computer

History of Computer

Computer Generations

Types of Computer

Classification of Computer

# Computer Components

Components of Computer System

Organization of Computer

System Bus

Computer Storage

Input / Output Devices

# Input/Output Devices

Input Devices

Output Devices

# Storage Devices

Main Memory

How does Memory Work

Memory Measuring Units

Data Organization within a byte or Word

Secondary Memory

# Number System

Data and Information

Number System

Number System Conversion

Representation of Number Using 1s and 2

Binary Arithmatic

# Boolean Algebra

Introduction

Boolean Algebra

Laws and theorms of Boolean Algebra

Karnaugh Map (K-Map)

# Computer Software

Introduction

System Software

Functions of an Operating System

Langauge Translator

Disk Operating System

# Introduction to Windows

Main Keywords Associated with Microsoft

Features of Windows

Windows Desktop

Using the Windows Explorer Program

Using Windows Controls