Computer Science | O-Levels

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    Chapter 1 Binary Systems and Hexadecimals ( 11 videos)  (Practice Test)

      1.1: Introduction (Practice Test)
      Introduction To Data Representation
    1. Introduction To Data Representation
      1153 views
      2. Introduction To Number System
    2. Introduction To Number System
      384 views
      1.2: The binary system (Practice Test)
      Decimal Numbers To Binary Numbers
    1. Decimal Numbers To Binary Numbers
      488 views
      2. More On Decimal Numbers To Binary
    2. More On Decimal Numbers To Binary
      307 views
      3. Real Numbers To Binary Numbers
    3. Real Numbers To Binary Numbers
      231 views
      4. Binary Numbers To Decimal Numbers
    4. Binary Numbers To Decimal Numbers
      259 views
      1.3: Meaurements of the size of Computer Memory (Practice Test)
      How To Find Memory Size And Processor Speed
    1. How To Find Memory Size And Processor Speed
      2. Units Of Computer Memory
    2. Units Of Computer Memory
      600 views
      3. Examples On Unit Conversion
    3. Examples On Unit Conversion
      84 views
      1.4: The Hexadecimal System (Practice Test)
      Decimal To Hexadecimal. Hexadecimal To Decimal
    1. Decimal To Hexadecimal. Hexadecimal To Decimal
      286 views
      2. Binary To Hexadecimal And Hexadecimal To Binary
    2. Binary To Hexadecimal And Hexadecimal To Binary
      445 views

    Chapter 2 Commuincation and Internet technologies ( 21 videos)  (Practice Test)

      2.1: Introduction
      What Is Data Communication
    1. What Is Data Communication
      560 views
      2.2: Data Transmission (Practice Test)
      Data Communication Terminologies
    1. Data Communication Terminologies
      892 views
      2. Components Of Communication System
    2. Components Of Communication System
      224 views
      3. Properties Of Good Communication System
    3. Properties Of Good Communication System
      282 views
      4. Transmission Modes Of Computer Network
    4. Transmission Modes Of Computer Network
      397 views
      5. Parallel Transmission
    5. Parallel Transmission
      18 views
      6. Asynchronous Transmission
    6. Asynchronous Transmission
      368 views
      7. Comparison Between Synchronous And Asynchronous
    7. Comparison Between Synchronous And Asynchronous
      229 views
      8. Common Types Of Communication Port
    8. Common Types Of Communication Port
      2.3: Error Checking methods
      The Parity Bit: Check For Errors
    1. The Parity Bit: Check For Errors
      2.4: Internet technologies (Practice Test)
      What is Internet
    1. What is Internet
      369 views
      2. Applications of Internet
    2. Applications of Internet
      6844 views
      3. Www: World Wide Web
    3. Www: World Wide Web
      1141 views
      4. Means Of Connecting Internet
    4. Means Of Connecting Internet
      5. Terminologies Related To Internet
    5. Terminologies Related To Internet
      423 views
      6. More On Terminologies
    6. More On Terminologies
      24 views
      7. Internet Protocol Address
    7. Internet Protocol Address
      239 views
      8. Introduction To Hyper Text Mark Up Language ( Html)
    8. Introduction To Hyper Text Mark Up Language ( Html)
      207 views
      9. Creating And Displaying Html Documents
    9. Creating And Displaying Html Documents
      204 views
      10. Tags Used To Markup Html Elements
    10. Tags Used To Markup Html Elements
      204 views
      11. File Transfer Protocol
    11. File Transfer Protocol

    Chapter 3 Logic Gates and Circuits ( 11 videos)  (Practice Test)

      3.1: Introduction to Logic Gates
      Logic Gates And Circuits: An Overview
    1. Logic Gates And Circuits: An Overview
      271 views
      3.2: Truth Tables
      Truth Table
    1. Truth Table
      222 views
      3.3: The function of six logic gates (Practice Test)
      AND Gate
    1. AND Gate
      321 views
      2. OR Gate
    2. OR Gate
      250 views
      3. NOT Gate
    3. NOT Gate
      194 views
      4. NOR Gate
    4. NOR Gate
      110 views
      5. NAND Gate
    5. NAND Gate
      102 views
      6. XOR Gate
    6. XOR Gate
      122 views
      7. XNOR Gate
    7. XNOR Gate
      113 views
      3.5: Logic Circuits
      Logic Statement To Logic Circuit Conversion
    1. Logic Statement To Logic Circuit Conversion
      230 views
      3.6: Logic Circuits in the Real World
      Simplification Techniques
    1. Simplification Techniques
      226 views

    Chapter 4 Operating Systems and Computer Architecture ( 15 videos)  (Practice Test)

      4.1: Operating Systems (Practice Test)
      The Concept Of Operating System
    1. The Concept Of Operating System
      3421 views
      2. Objectives Of Operating System
    2. Objectives Of Operating System
      3513 views
      3. Functions Of Operating System
    3. Functions Of Operating System
      14403 views
      4. More On Functions Of Operating System
    4. More On Functions Of Operating System
      74 views
      4.2: Interrupts
      Interrupts
    1. Interrupts
      34 views
      4.3: Computer Architecture (Practice Test)
      Introduction To Computer Architecture
    1. Introduction To Computer Architecture
      36 views
      2. Bus And Types Of Buses
    2. Bus And Types Of Buses
      741 views
      3. Von Neumann Model
    3. Von Neumann Model
      15 views
      4. Central Processing Unit: Alu, Control Unit
    4. Central Processing Unit: Alu, Control Unit
      5332 views
      5. General Purpose Register 2
    5. General Purpose Register 2
      2062 views
      6. Cpu Terminologies: Data Path, Cpu Cycle, Control Path
    6. Cpu Terminologies: Data Path, Cpu Cycle, Control Path
      21 views
      7. Memory Operations
    7. Memory Operations
      38 views
      8. Internal Processor Memory: Registers
    8. Internal Processor Memory: Registers
      646 views
      9. Microprocessor
    9. Microprocessor
      582 views
      4.4: The fetch Execute Cycle (Practice Test)
      Fetch Execute Cycle
    1. Fetch Execute Cycle
      210 views

    Chapter 5 Input and Output devices ( 21 videos)  (Practice Test)

      5.1: Introudction
      Peripherals
    1. Peripherals
      1921 views
      5.2: Input devices (Practice Test)
      Scanners And Its Types
    1. Scanners And Its Types
      242 views
      2. More On Scanners
    2. More On Scanners
      142 views
      3. Barcode And Qr Readers
    3. Barcode And Qr Readers
      126 views
      4. Digital Camera
    4. Digital Camera
      215 views
      5. Keyboard
    5. Keyboard
      473 views
      6. Touch Pad
    6. Touch Pad
      96 views
      7. Joy Stick
    7. Joy Stick
      239 views
      8. Track Ball
    8. Track Ball
      459 views
      9. Mouse
    9. Mouse
      282 views
      10. Touch Screen
    10. Touch Screen
      112 views
      11. Light Pen
    11. Light Pen
      2834 views
      12. Microphone
    12. Microphone
      178 views
      13. Input Device Sensors
    13. Input Device Sensors
      307 views
      5.3: Output devices (Practice Test)
      Printers And Its Types
    1. Printers And Its Types
      758 views
      2. Monitors
    2. Monitors
      366 views
      3. Types Of Monitors: Crt Monitor
    3. Types Of Monitors: Crt Monitor
      334 views
      4. Plotter
    4. Plotter
      287 views
      5. Speakers
    5. Speakers
      94 views
      6. Multimedia Projector
    6. Multimedia Projector
      63 views
      7. 3D and holographic imaging and Virtual Reality
    7. 3D and holographic imaging and Virtual Reality

    Chapter 6 Memory and Data Storage ( 9 videos)  (Practice Test)

      6.1: Introduction
      Storage Hardware: Memory
    1. Storage Hardware: Memory
      622 views
      6.2: Memory and Storage (Practice Test)
      Computer Memory : Why It Is Necessary For Computer
    1. Computer Memory : Why It Is Necessary For Computer
      562 views
      2. Main Memory
    2. Main Memory
      3. Ram: Random Access Memory
    3. Ram: Random Access Memory
      691 views
      4. Types Of Ram: Dram And Sram
    4. Types Of Ram: Dram And Sram
      860 views
      5. Rom: Read Only Memory
    5. Rom: Read Only Memory
      652 views
      6. Hard Disk
    6. Hard Disk
      1327 views
      7. Flash Memory Cards
    7. Flash Memory Cards
      286 views
      8. Cd ( Compact Disk)
    8. Cd ( Compact Disk)
      3356 views

    Chapter 7 High and Low Level Languages ( 12 videos)  (Practice Test)

      7.1: Programming Languages (Practice Test)
      Programming Languages: An Overview
    1. Programming Languages: An Overview
      1084 views
      2. Machine Language
    2. Machine Language
      796 views
      3. Assembly Language
    3. Assembly Language
      606 views
      4. High Level Language
    4. High Level Language
      330 views
      5. Characteristics Of High Level Languages
    5. Characteristics Of High Level Languages
      1061 views
      6. Computer Program
    6. Computer Program
      1590 views
      7.2: Translators
      Language Translators : An Overview
    1. Language Translators : An Overview
      583 views
      7.3: What happens when things go wrong (Practice Test)
      Meaning of 'program syntax'
    1. Meaning of 'program syntax'
      529 views
      2. Types Of Error: Syntax Error
    2. Types Of Error: Syntax Error
      198 views
      3. Types Of Error: Runtime Error
    3. Types Of Error: Runtime Error
      147 views
      4. Types Of Error: Logical Error
    4. Types Of Error: Logical Error
      191 views
      5. Understanding of Integrated Development Environment : IDE
    5. Understanding of Integrated Development Environment : IDE
      514 views

    Chapter 8 Security and Ethics ( 17 videos)  (Practice Test)

      8.1: Introduction
      What Is Information Security
    1. What Is Information Security
      83 views
      8.2: Security and Data Integrity (Practice Test)
      Privacy Issues And Hacking
    1. Privacy Issues And Hacking
      382 views
      2. Computer Virus: What Is Virus And How It Spreads
    2. Computer Virus: What Is Virus And How It Spreads
      433 views
      3. Virus Hoax
    3. Virus Hoax
      610 views
      4. Worm, Adware, Spyware, Malware
    4. Worm, Adware, Spyware, Malware
      152 views
      5. Types Of Virus
    5. Types Of Virus
      28 views
      6. Hacker And Cracker
    6. Hacker And Cracker
      1296 views
      7. Phishing In Information Security
    7. Phishing In Information Security
      8.3: Loss of Data and Data Compression
      Backup Of Data
    1. Backup Of Data
      8.4: Firewalls and Proxy servers
      Firewalls, Encryption And Audits
    1. Firewalls, Encryption And Audits
      5 views
      8.5: Encryption
      Everyday Encryption On Internet And Cipher Methods
    1. Everyday Encryption On Internet And Cipher Methods
      8.6: Applications (Practice Test)
      Authentication Methodologies: Password And Pin Number
    1. Authentication Methodologies: Password And Pin Number
      450 views
      2. Access Card And Biometrics
    2. Access Card And Biometrics
      79 views
      3. Multi Model Authentication
    3. Multi Model Authentication
      67 views
      4. Information Security Terminologies
    4. Information Security Terminologies
      267 views
      8.7: Computer Ethics
      Areas Of Computer Ethics: Information Accuracy
    1. Areas Of Computer Ethics: Information Accuracy
      502 views
      8.8: Free Software, Free Ware, and Shareware
      Software Terminologies
    1. Software Terminologies
      846 views

    Chapter 9 Problem Solving and Design ( 15 videos)  (Practice Test)

      9.1: Introduction (Practice Test)
      Computer System And Its Components
    1. Computer System And Its Components
      3240 views
      2. What Is Top Down Design
    2. What Is Top Down Design
      19 views
      3. What Is A Flow Chart
    3. What Is A Flow Chart
      1061 views
      4. Basic Principles To Write A Pseudo Code
    4. Basic Principles To Write A Pseudo Code
      14 views
      5. Header Files And Reserved Words In C++
    5. Header Files And Reserved Words In C++
      449 views
      6. Procedural Languages
    6. Procedural Languages
      1639 views
      9.2: Algorithms (Practice Test)
      What Is An Algorithm
    1. What Is An Algorithm
      969 views
      2. How To Write An Algorithm
    2. How To Write An Algorithm
      1337 views
      3. Algorithm Examples
    3. Algorithm Examples
      2001 views
      4. Flow Chart Examples
    4. Flow Chart Examples
      817 views
      5. Flow Chart Examples_2
    5. Flow Chart Examples_2
      830 views
      9.3: Test Data
      Test Data In Algorithms
    1. Test Data In Algorithms
      9.4: Validation and Verification
      Validation And Verification Techniques In Algorithms
    1. Validation And Verification Techniques In Algorithms
      9.5: Using Trace tables
      Using Trace Tables In Testing Algorithm
    1. Using Trace Tables In Testing Algorithm
      9.6: Producing Algorithms
      Examples: Producing An Effective Algorithm
    1. Examples: Producing An Effective Algorithm

    Chapter 10 Pseudo code and Flow charts ( 17 videos)  (Practice Test)

      10.1: Conditional Statements (Practice Test)
      What is Control Structure
    1. What is Control Structure
      865 views
      2. Unconditional transfer of control
    2. Unconditional transfer of control
      507 views
      3. Why a Control Structure is important in Programming
    3. Why a Control Structure is important in Programming
      415 views
      4. Introduction To Decision And Selection Statements
    4. Introduction To Decision And Selection Statements
      248 views
      5. Introduction to if-else structure
    5. Introduction to if-else structure
      345 views
      6. if-else example problems
    6. if-else example problems
      411 views
      7. What Is Switch... Case
    7. What Is Switch... Case
      278 views
      8. Switch Default Statement
    8. Switch Default Statement
      399 views
      9. Examples On Switch... Case
    9. Examples On Switch... Case
      238 views
      10.2: Loop Structure (Practice Test)
      What is Repetition Structure
    1. What is Repetition Structure
      600 views
      2. Why we need a Repetition Structure in Programming
    2. Why we need a Repetition Structure in Programming
      375 views
      3. Types of Loop
    3. Types of Loop
      1158 views
      10.3: Input and Output Statements (Practice Test)
      scanf function in C
    1. scanf function in C
      431 views
      2. printf function in C
    2. printf function in C
      758 views
      10.4: Standard Flow chart and Symbols (Practice Test)
      Basic Components To Design A Flow Chart
    1. Basic Components To Design A Flow Chart
      177 views
      2. Advantages Of Flow Chart
    2. Advantages Of Flow Chart
      1304 views
      3. Flowchart Requirements
    3. Flowchart Requirements
      47 views

    Chapter 11 Programming Concepts ( 6 videos)  (Practice Test)

      11.1: Declaration and Use of Variables (Practice Test)
      What are Constants
    1. What are Constants
      475 views
      2. Computer Program to illustrate Constants
    2. Computer Program to illustrate Constants
      311 views
      3. The Concept of Variable
    3. The Concept of Variable
      324 views
      4. Rules for naming variable
    4. Rules for naming variable
      470 views
      5. Declartion of variable
    5. Declartion of variable
      23 views
      11.2: Basic Data type
      Datatypes in C
    1. Datatypes in C
      398 views

    Chapter 12 Data Structures , arrays and using Pre release material ( 12 videos)  (Practice Test)

      12.1: Arrays (Practice Test)
      Problem Statement: Why we need Arrays
    1. Problem Statement: Why we need Arrays
      251 views
      2. What are Arrays
    2. What are Arrays
      196 views
      3. Terminologies used in Arrays
    3. Terminologies used in Arrays
      56 views
      4. Examples on Arrays
    4. Examples on Arrays
      194 views
      5. Defining an Array
    5. Defining an Array
      29 views
      6. How to declare an Array in a Program
    6. How to declare an Array in a Program
      136 views
      7. Accessing array index with examples
    7. Accessing array index with examples
      184 views
      8. Initialization of Array
    8. Initialization of Array
      100 views
      9. Fill array index with examples
    9. Fill array index with examples
      125 views
      10. Fill array with user input
    10. Fill array with user input
      259 views
      11. Dynamic Method Using Loop
    11. Dynamic Method Using Loop
      83 views
      12. Traversing An Array
    12. Traversing An Array
      2170 views

    Chapter 13 Databases ( 10 videos)  (Practice Test)

      13.1: Introduction
      Introduction to Database
    1. Introduction to Database
      648 views
      13.2: What are database used for
      Objectives Of Database
    1. Objectives Of Database
      17 views
      13.3: Structure of Database (Practice Test)
      Keys: Primary Key
    1. Keys: Primary Key
      170 views
      2. Relation And Table
    2. Relation And Table
      114 views
      3. Degree Of A Relationship
    3. Degree Of A Relationship
      166 views
      13.4: Practical Use of Database (Practice Test)
      Create Database Using Database Wizard
    1. Create Database Using Database Wizard
      446 views
      2. Creating A New Table
    2. Creating A New Table
      136 views
      3. Introduction To Queries
    3. Introduction To Queries
      57 views
      4. Planning A Query
    4. Planning A Query
      28 views
      5. Types Of Queries: Select Query, Action Query
    5. Types Of Queries: Select Query, Action Query
      2034 views