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Computer Basics – Input/Output Devices, Memory, CPU & Full Fundamentals + MCQs (SSC, Railway, UPSC 2026)

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📖 1. Introduction (परिचय)

Hindi:

आज के समय में कंप्यूटर ज्ञान हर competitive exam के लिए आवश्यक हो गया है। SSC, Railway, Banking और UPSC परीक्षाओं में Computer Awareness से सीधे प्रश्न पूछे जाते हैं।

English:

In today’s world, computer knowledge is essential for all competitive exams. Questions related to computer awareness are frequently asked in SSC, Railway, Banking, and UPSC exams.

💻 2. What is Computer? (कंप्यूटर क्या है?)

📌 Definition

Hindi:

कंप्यूटर एक इलेक्ट्रॉनिक मशीन है जो इनपुट लेती है, उसे प्रोसेस करती है और आउटपुट देती है।

English:

A computer is an electronic device that takes input, processes it, and produces output.

🔄 Basic Working Cycle

Input → Process → Output → Storage

🧠 3. Components of Computer (मुख्य भाग)

ComponentFunctionInput UnitData inputCPUProcessingOutput UnitResult displayMemoryStorage

⌨️ 4. Input Devices (इनपुट डिवाइस)

📌 Definition

Hindi:

वे उपकरण जिनसे हम कंप्यूटर में डेटा डालते हैं।

English:

Devices used to enter data into a computer.

🔹 Examples

  • Keyboard
  • Mouse
  • Scanner
  • Microphone
  • Webcam

🎯 Key Points

  • Keyboard → most common
  • Mouse → pointing device
  • Scanner → converts hard copy to soft copy

🖥️ 5. Output Devices (आउटपुट डिवाइस)

📌 Definition

Hindi:

वे उपकरण जो परिणाम दिखाते हैं।

English:

Devices that display results.

🔹 Examples

  • Monitor
  • Printer
  • Speaker
  • Projector

🎯 Key Points

  • Monitor = Soft copy
  • Printer = Hard copy

🧠 6. CPU (Central Processing Unit)

📌 Definition

Hindi:

CPU कंप्यूटर का दिमाग होता है।

English:

CPU is the brain of the computer.

🔧 Parts of CPU

PartFunctionALUArithmetic calculationsCUControl unitRegistersTemporary storage

🎯 Key Points

  • ALU → calculations
  • CU → control operations

💾 7. Memory (मेमोरी)

📌 Definition

Hindi:

मेमोरी वह स्थान है जहाँ डेटा स्टोर होता है।

English:

Memory is the storage area for data.

🔹 Types of Memory

1. Primary Memory

  • RAM
  • ROM

🔸 RAM (Random Access Memory)

Hindi:

  • Temporary memory
  • Volatile

English:

  • Temporary memory
  • Data lost when power off

🔸 ROM (Read Only Memory)

Hindi:

  • Permanent memory
  • Non-volatile

English:

  • Permanent storage

2. Secondary Memory

  • Hard Disk
  • SSD
  • Pen Drive
  • CD/DVD

🎯 Key Points

  • RAM = Fast but temporary
  • ROM = Permanent
  • Secondary = Large storage

🧠 8. Hardware vs Software

🔹 Hardware

Hindi:

जो हम छू सकते हैं

English:

Physical components

🔹 Software

Hindi:

Programs और applications

English:

Programs that run on hardware

🔹 Types of Software

  • System Software (OS)
  • Application Software

🧠 9. Important Computer Terms

TermMeaningBitSmallest unitByte8 bitsKB1024 bytesMB1024 KBGB1024 MB

🌐 10. Internet Basics

📌 Definition

Hindi:

Internet एक वैश्विक नेटवर्क है

English:

Internet is a global network

🔹 Important Terms

  • WWW (World Wide Web)
  • HTTP
  • URL
  • Browser

🎯 11. Exam-Oriented Facts

  • CPU = Brain
  • RAM = Volatile
  • ROM = Non-volatile
  • Keyboard = Input
  • Monitor = Output

🧪 12. MCQs Practice

Q1. CPU का फुल फॉर्म क्या है?

A. Central Process Unit

B. Central Processing Unit ✅

C. Computer Processing Unit

D. Central Power Unit

Q2. RAM कैसी memory है?

A. Permanent

B. Temporary ✅

C. Secondary

D. External

Q3. Keyboard क्या है?

A. Output

B. Input ✅

C. Memory

D. CPU

Q4. Printer क्या देता है?

A. Soft copy

B. Hard copy ✅

C. Memory

D. Input

Q5. ROM क्या है?

A. Temporary

B. Permanent ✅

C. Volatile

D. Input

📌 13. Previous Year Trends

Hindi:

SSC/Railway में पूछा जाता है:

  • RAM vs ROM
  • CPU parts
  • Input/Output devices

English:

Frequently asked:

  • RAM vs ROM
  • CPU parts
  • Devices

🔚 14. Conclusion

Hindi:

Computer basics हर exam के लिए जरूरी है और इसे अच्छे से समझना scoring section बन सकता है।

English:

Computer basics are essential for all exams and can be a scoring section.

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