Input Devices
Delhi Police Exams
In the Delhi Police Computer Knowledge section, input devices are frequently asked in MCQs, especially in 1-mark questions. Understanding each device, its use, and type will help you answer quickly. Here's a complete exam-ready article with tricks, PYQs, practice, and recap.
Common Input Devices
| Device | Full Form / Meaning | Use / Function |
|---|---|---|
| Keyboard | — | Used to enter text and commands into the computer |
| Mouse | — | Pointing device to select, drag, and click on-screen objects |
| Scanner | — | Converts physical documents/images into digital format |
| MICR | Magnetic Ink Character Recognition | Reads characters printed with magnetic ink (used in banking cheques) |
| OMR | Optical Mark Recognition | Reads marks on specially designed forms (e.g., multiple-choice answer sheets) |
| OCR | Optical Character Recognition | Converts printed or handwritten text into digital text |
| Trackball | — | Stationary pointing device; user rotates ball to move cursor |
| Joystick | — | Controls movement in games or simulations |
| Digital Pen / Stylus | — | Input device for writing/drawing on touch screens |
| Webcam | — | Captures video or images for input |
Tip: Focus on understanding the specific use cases for each input device, especially MICR, OMR, and OCR
Practice Questions (Delhi Police PYQ-style)
Which of the following is an input device?
Options: (a) Monitor (b) Keyboard (c) Speaker (d) Printer
Category: Basic Input Devices
Show Answer
Keyboard
Which device reads marks on multiple-choice answer sheets?
Options: (a) OCR (b) MICR (c) OMR (d) Scanner
Category: Specialized Input Devices
Show Answer
OMR
MICR technology is mainly used in:
Options: (a) Scanning documents (b) Banking cheques (c) Handwriting recognition (d) Gaming
Category: Banking Technology
Show Answer
Banking cheques
Mini Practical Task: Input Device Table
Task Instructions:
Create a 2-column table:
Formatting Requirements:
Pro Tip:
Draw arrows showing input device → CPU → Output to visualize data flow. This helps understand the complete computer system working.
Quick Recap & Tricks
Device Categories:
Keyboard / Mouse / Trackball / Joystick → Manual input
Scanner / OCR → Convert documents into digital text
MICR → Banking, magnetic ink
Memory Trick:
"Kangaroos Move Slowly, Mostly Over Clouds Watching"
Keyboard, Mouse, Scanner, MICR, OMR, OCR, Webcam
OMR → Exams, answer sheets
Webcam / Digital Pen → Visual input
Exam Tip: These devices are almost always asked in Delhi Police Constable / SI exams, often in one-liner MCQs. Practice 10 questions daily to master them.
Master Input Devices for Delhi Police Exam!
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