Input Devices इनपुट डिवाइस | Types, Examples & CPCT Notes
Input devices are hardware components used to enter data, instructions, commands, or signals into a computer system.
इनपुट डिवाइस (Input Devices) कंप्यूटर के वे हार्डवेयर उपकरण हैं जिनका उपयोग कंप्यूटर में डेटा, निर्देश (Instructions), Commands या Signals दर्ज करने के लिए किया जाता है।
A computer cannot process useful information unless data is provided to it. Input devices provide the interface through which the user communicates with the computer.
Input devices उपयोगकर्ता और कंप्यूटर के बीच communication का माध्यम हैं। इनके द्वारा दिए गए input को computer process करके meaningful output प्रदान करता है।
Basic Computer Cycle
Input → Processing → Output → Storage
Input → Processing → Output → Storage
1. Keyboard – कीबोर्ड
A Keyboard is one of the most commonly used input devices. It is used to enter letters, numbers, symbols and commands.
Keyboard सबसे सामान्य input devices में से एक है। इसका उपयोग अक्षर, संख्याएँ, symbols और commands enter करने के लिए किया जाता है।
Important Keys
- Alphabet Keys – A to Z
- Number Keys – 0 to 9
- Function Keys – F1 to F12
- Enter Key
- Spacebar
- Backspace
- Delete
- Shift
- Ctrl
- Alt
- Esc
- Arrow Keys
CPCT Trick
Keyboard = Text & Character Input
2. Mouse – माउस
A Mouse is a pointing input device used to control the pointer on the computer screen.
Mouse एक pointing input device है जिसका उपयोग screen पर pointer को control करने के लिए किया जाता है।
Common Mouse Operations
- Click
- Double Click
- Right Click
- Drag and Drop
- Scroll
CPCT Trick
Mouse = Pointing Device
3. Scanner – स्कैनर
A Scanner converts printed documents or images into digital form.
Scanner किसी printed document या image को digital form में convert करता है।
Example
यदि आपके पास कोई paper document है, तो scanner उसकी digital copy computer में बना सकता है।
CPCT Trick:
Scanner = Paper → Digital
4. Microphone – माइक्रोफोन
A Microphone is used to input sound or voice into a computer.
Microphone का उपयोग computer में आवाज या sound input करने के लिए किया जाता है।
Uses
- Voice Recording
- Video Conferencing
- Voice Commands
- Online Classes
- Speech Recognition
CPCT Trick
Microphone = Sound Input
5. Webcam – वेबकैम
A Webcam is a camera used to capture images and video and provide them as input to a computer.
Webcam एक camera device है जो images और video को capture करके computer में input के रूप में देता है।
Uses
- Video Calling
- Online Classes
- Video Conferencing
- Live Streaming
- Face Recognition
CPCT Trick
Webcam = Video/Image Input
6. Joystick – जॉयस्टिक
A Joystick is an input device commonly used to control movement in games and simulations.
Joystick का उपयोग मुख्यतः games और simulation systems में objects या characters की movement को control करने के लिए किया जाता है।
Uses
- Computer Games
- Flight Simulators
- Training Simulators
CPCT Trick:
Joystick = Gaming & Simulation
7. Touchscreen – टचस्क्रीन
A Touchscreen allows users to interact with a device by touching the screen.
Touchscreen पर उपयोगकर्ता screen को touch करके directly commands और selections दे सकता है।
Examples:
- Smartphones
- Tablets
- ATMs
- Information kiosks
Important CPCT Point
A touchscreen can function as both an Input and Output device because it displays information and also accepts touch input.
8. Light Pen – लाइट पेन
A Light Pen is a pointing device that was historically used with certain computer displays to select or draw objects directly on the screen.
Light Pen एक pointing device था जिसका उपयोग screen पर directly objects select या draw करने के लिए किया जाता था।
CPCT Trick
Light Pen = Pointing & Selecting
Note: Modern computers generally use touchscreens, styluses and other pointing devices instead of traditional light pens.
9. Barcode Reader – बारकोड रीडर
A Barcode Reader reads the information encoded in a barcode and sends it to the computer.
Barcode Reader barcode में encoded information को read करके computer system में input करता है।
Uses
- Supermarkets
- Retail Stores
- Inventory Management
- Product Identification
CPCT Trick
Barcode Reader = Barcode → Computer Data
10. OCR – Optical Character Recognition
OCR stands for Optical Character Recognition.
OCR technology recognizes printed or handwritten characters from an image and converts them into machine-readable text.
OCR printed या कुछ स्थितियों में handwritten characters को पहचानकर उन्हें machine-readable text में convert करता है।
Example
Printed book page → Scan → OCR → Editable Text
CPCT Trick
OCR = Characters → Editable Text
11. OMR – Optical Mark Recognition
OMR stands for Optical Mark Recognition.
OMR detects marked areas on specially designed forms or answer sheets.
OMR specially designed forms या answer sheets पर किए गए marks को detect करता है।
Uses
- Competitive Exam Answer Sheets
- Surveys
- Forms
- Objective Tests
CPCT Trick
OMR = Marks Detection
👉 OMR को marks पढ़ने के लिए याद रखें।
12. MICR – Magnetic Ink Character Recognition
MICR stands for Magnetic Ink Character Recognition.
MICR is used to recognize characters printed using special magnetic ink, especially in banking.
MICR विशेष magnetic ink से printed characters को पहचानने की तकनीक है, जिसका प्रमुख उपयोग banking में किया जाता है।
Main Use
Bank Cheques
CPCT Trick
MICR = Magnetic Ink = Banking/Cheque
13. Biometric Devices – बायोमेट्रिक डिवाइस
Biometric input devices identify or verify a person using physical or behavioral characteristics.
Biometric devices व्यक्ति की physical या behavioral characteristics के आधार पर उसकी पहचान या verification करते हैं।
Examples
- Fingerprint Scanner
- Iris Scanner
- Face Recognition Camera
- Voice Recognition System
Uses
- Authentication
- Attendance
- Security Systems
- Access Control
CPCT Trick
Biometric = Body-based Identification
14. Graphics Tablet – ग्राफिक्स टैबलेट
A Graphics Tablet is an input device used to draw or write digitally using a stylus.
Graphics Tablet का उपयोग stylus की सहायता से digitally drawing और writing करने के लिए किया जाता है।
Uses
- Digital Art
- Graphic Design
- Animation
- CAD
- Digital Illustration
📊 Important Input Devices – Quick Revision
| Input Device | Main Function |
|---|---|
| Keyboard | Text & character input |
| Mouse | Pointing and selection |
| Scanner | Document/Image → Digital |
| Microphone | Sound input |
| Webcam | Image/Video input |
| Joystick | Gaming/Simulation |
| Touchscreen | Touch input + Display |
| Barcode Reader | Barcode reading |
| OCR | Character recognition |
| OMR | Mark recognition |
| MICR | Magnetic characters/Cheques |
| Biometric Scanner | Identity verification |
| Graphics Tablet | Digital drawing |
🧠 CPCT Memory Tricks
Input Devices को Function से याद करें:
Keyboard → Text
Mouse → Point
Scanner → Paper
Microphone → Sound
Webcam → Video
Joystick → Game
OCR → Character
OMR → Mark
MICR → Magnetic Ink
Barcode Reader → Barcode
Biometric → Identity
⭐ Super Trick
“Text Point Paper Sound Video Game — Character Mark Magnetic Barcode Identity”
इस sequence को functions के साथ जोड़कर याद करने से कई CPCT questions आसानी से solve किए जा सकते हैं।
🔥 Most Important CPCT Differences
OCR vs OMR vs MICR
| Feature | OCR | OMR | MICR |
|---|---|---|---|
| Full Form | Optical Character Recognition | Optical Mark Recognition | Magnetic Ink Character Recognition |
| Reads | Characters | Marks | Magnetic Characters |
| Common Use | Printed Text | Answer Sheets | Bank Cheques |
| Memory Trick | Character | Mark | Magnetic Ink |
याद रखें:
OCR → Character
OMR → Mark
MICR → Cheque
🎯 Important CPCT Questions
Q1. Which device is used to enter text into a computer?
Answer: Keyboard
Q2. Which device is known as a pointing device?
Answer: Mouse
Q3. Which device converts a paper document into digital form?
Answer: Scanner
Q4. Which device is used to input sound?
Answer: Microphone
Q5. Which device is commonly used for gaming?
Answer: Joystick
Q6. Which technology is commonly used to read marks on objective answer sheets?
Answer: OMR
Q7. Which technology is used to recognize characters from scanned documents?
Answer: OCR
Q8. Which technology is associated with bank cheques?
Answer: MICR
Q9. Which device reads product barcodes?
Answer: Barcode Reader
Q10. Which device can work as both input and output?
Answer: Touchscreen
Q11. Which device is used for fingerprint-based authentication?
Answer: Biometric Scanner
Q12. Which device is mainly used for digital drawing?
Answer: Graphics Tablet
📌 CPCT One-Minute Revision
INPUT DEVICES
Keyboard → Mouse → Scanner → Microphone → Webcam → Joystick → Touchscreen → Barcode Reader → OCR → OMR → MICR → Biometric → Graphics Tablet
Remember:
Input = Data Goes IN
Conclusion – निष्कर्ष
Input devices are an essential part of a computer system because they provide the means to enter data and instructions into the computer.
Input Devices कंप्यूटर सिस्टम का महत्वपूर्ण भाग हैं क्योंकि इनके माध्यम से computer में data और instructions enter किए जाते हैं।
For CPCT and other competitive examinations, students should particularly remember the function and common use of Keyboard, Mouse, Scanner, OCR, OMR, MICR, Barcode Reader, Biometric devices and Touchscreen.
Final CPCT Formula
Keyboard = Text
Mouse = Pointing
Scanner = Document
Microphone = Sound
Webcam = Video
OCR = Character
OMR = Mark
MICR = Cheque
Barcode = Product
Biometric = Identity
📚 More CPCT Notes, MCQs & Computer Fundamentals:
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