Computer Fundamentals Complete Notes
Rajasthan Computer Teacher | KVS | NET | GATE | DSSSB | NVS Exam Notes + MCQs
Introduction to Computer
A computer is an electronic data processing device that accepts data as input, processes it according to instructions, stores data, and generates meaningful output.
Main Functions of Computer:
- Input
- Processing
- Storage
- Output
- Control
Characteristics of Computer
| Characteristic | Description |
|---|---|
| Speed | Performs billions of calculations per second |
| Accuracy | Produces precise results |
| Diligence | Works continuously without fatigue |
| Versatility | Can perform multiple tasks |
| Automation | Works automatically after instructions |
GIGO Principle: Garbage In Garbage Out means incorrect input produces incorrect output.
Evolution of Computers
| Device | Description |
|---|---|
| Abacus | First calculating device |
| Slide Rule | Early analog calculator |
| Adding Machine | First mechanical calculator |
Generations of Computers
| Generation | Technology | Features |
|---|---|---|
| First Generation | Vacuum Tubes | Large size, machine language |
| Second Generation | Transistors | Faster and smaller |
| Third Generation | Integrated Circuits | Keyboard and monitor introduced |
| Fourth Generation | Microprocessors | Personal computers introduced |
| Fifth Generation | Artificial Intelligence | Voice recognition and robotics |
Computer Components
| Component | Function |
|---|---|
| Input Unit | Accepts data |
| CPU | Processes instructions |
| Memory Unit | Stores information |
| Output Unit | Displays results |
Central Processing Unit (CPU)
CPU is called the brain of the computer system.
| CPU Component | Function |
|---|---|
| ALU | Arithmetic and logical operations |
| Control Unit | Controls all operations |
| Registers | Temporary storage locations |
| Cache Memory | Improves processing speed |
Important Registers
| Register | Function |
|---|---|
| MAR | Stores memory address |
| MBR | Stores memory data |
| PC | Stores next instruction address |
| IR | Stores current instruction |
| Accumulator | Stores intermediate results |
Memory Types
| Memory | Type | Feature |
|---|---|---|
| RAM | Volatile | Temporary memory |
| ROM | Non-Volatile | Permanent memory |
| Cache | Fast Memory | Located between CPU and RAM |
| Register | Fastest Memory | Inside CPU |
Input Devices
- Keyboard
- Mouse
- Scanner
- Joystick
- Microphone
- OCR
- Barcode Reader
- Webcam
Output Devices
- Monitor
- Printer
- Speaker
- Plotter
- Projector
Storage Devices
| Storage Device | Description |
|---|---|
| Hard Disk | Magnetic permanent storage |
| SSD | Solid State Storage |
| CD/DVD | Optical storage |
| Flash Drive | Portable storage |
Software Types
| Software Type | Examples |
|---|---|
| System Software | Windows, Linux |
| Application Software | MS Word, Excel, Photoshop |
Important Inventors and Contributions
| Person | Contribution |
|---|---|
| Charles Babbage | Father of Computer |
| Alan Turing | Father of Computer Science |
| John Von Neumann | Stored Program Concept |
| George Stibitz | First Electronic Calculator |
| Vijay Bhatkar | Indian Supercomputer Development |
Important Facts for Exams
- IBM = International Business Machines
- BIOS = Basic Input Output System
- POST = Power On Self Test
- UNIX was developed in 1969
- Intel 4004 was first microprocessor
- PARAM 8000 was first Indian supercomputer
- DARPA developed early computer network
High Quality MCQs
1. Which generation used Integrated Circuits?
A. First
B. Second
C. Third
D. Fourth
Answer: C. Third Generation
2. Which memory is volatile?
A. ROM
B. HDD
C. RAM
D. DVD
Answer: C. RAM
3. Father of Computer Science is:
A. Charles Babbage
B. Alan Turing
C. John Von Neumann
D. Herman Hollerith
Answer: B. Alan Turing
4. BIOS is stored in:
A. RAM
B. Cache
C. ROM
D. Register
Answer: C. ROM
5. Intel 4004 was:
A. Operating System
B. First Microprocessor
C. First RAM
D. First Computer
Answer: B. First Microprocessor
6. PARAM 8000 was developed by:
A. ISRO
B. IBM
C. C-DAC
D. DRDO
Answer: C. C-DAC
7. Which register stores next instruction address?
A. IR
B. MAR
C. PC
D. MBR
Answer: C. PC
8. Which device is called pointing device?
A. Scanner
B. Keyboard
C. Mouse
D. Printer
Answer: C. Mouse
9. GIGO stands for:
A. Good Input Good Output
B. Garbage In Garbage Out
C. General Input General Output
D. Global Input Global Output
Answer: B. Garbage In Garbage Out
10. Which language is a Fourth Generation Language?
A. C
B. Java
C. SQL
D. Python
Answer: C. SQL
Preparation Strategy for Rajasthan Computer Teacher & NET/GATE
- Revise computer generations daily.
- Memorize inventors and contributions.
- Practice previous year MCQs regularly.
- Focus on CPU architecture and memory hierarchy.
- Understand practical applications of hardware devices.
- Prepare short revision notes weekly.