Looking for comprehensive PGDCA (Post Graduate Diploma in Computer Applications) notes on Input Devices for the 2026–27 academic session? Access complete theory explanations, hardware classifications, short notes, long analytical answers, objective MCQs, and exam-oriented solutions covering Keyboards, Pointing Devices (Mouse, Trackball, Touchpad, Joystick), Direct Data Entry Devices (Scanners, OMR, OCR, MICR, Barcode/QR Code Readers), Voice Recognition Systems, and Biometric Input Sensors tailored for university diploma exams.
Input Devices
Definition for Exam:
An Input Device is an electromechanical hardware peripheral used to feed raw data, user commands, and signals into a computer system for processing.
Essential Input Devices:
- Keyboard: Primary text-entry device utilizing alphanumeric, function, and control keys.
- Mouse: Pointing device using optical sensors or trackballs to move a graphic cursor.
- Scanner: Optical device that converts physical hardcopy documents into digital image files.
- Optical Mark Reader (OMR): Detects pre-printed marks on specialized forms (used for grading objective exams).
- Magnetic Ink Character Recognition (MICR): Reads magnetized ink characters printed on bank cheques for rapid clearing.
- Barcode Reader (BCR): Emits light beams to scan and decode parallel line patterns on products.
PGDCA Input Devices Notes
Q1. Define an Input Device with two examples. [2 Marks]
Answer: An Input Device is an electromechanical hardware peripheral used to enter raw data, commands, and signals into a computer system.
Examples: Keyboard, Mouse.
Q2. How does an Optical Mark Reader (OMR) work? [2 Marks]
Answer: An OMR device projects a light beam onto pre-printed forms (such as multiple-choice answer sheets). It detects the presence or absence of a mark by measuring the reflected light intensity off shaded pencil/ink areas.
PGDCA OMR OCR MICR Scanners Important Questions 2026-27
Q3. Explain the working and application of MICR. [3 Marks]
Answer: MICR (Magnetic Ink Character Recognition) reads characters printed with special iron-oxide magnetic ink.
- Working: The device magnetizes the ink characters and passes them under a read-head that recognizes the distinct magnetic field pattern of each character.
- Application: Used extensively by banks for high-speed, tamper-proof clearing of paper cheques.
PGDCA Direct Data Entry and Pointing Devices Solutions
Q4. Differentiate between a Flatbed Scanner and a Barcode Reader. [2 Marks]
Answer:
- Flatbed Scanner: Captures an entire physical document/photo and converts it into a digital image file.
- Barcode Reader: Uses a laser/LED beam to read and decode specific printed parallel black-and-white line patterns (barcodes) representing item IDs.
Input Devices PGDCA Syllabus Question Answer
Q5. Write a short note on Pointing Devices. [3 Marks]
Answer: Pointing Devices are input hardware used to control the movement of an on-screen graphic cursor/pointer in a Graphical User Interface (GUI).
- Mouse: Moved across a flat surface to trigger clicks and drags.
- Trackball: Uses a stationary housing with an exposed rotatable ball.
- Touchpad: Uses capacitive sensors to track finger movements on laptops.
⌨️ PGDCA Exam Preparation Notice: This page provides curated PGDCA (Post Graduate Diploma in Computer Applications) Input Devices Study Material & Solutions updated for the 2026–27 academic session. This complete guide features functional peripheral classification charts, optical reader comparative breakdowns (OMR vs OCR vs MICR), digitizer/scanner working principles, and high-yield exam questions designed to help you secure top marks in your semester examinations.
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