Input, Output & Peripheral Devices — Complete JKSSB Computer Notes with All PYQs

Computer Notes  |  JKSSB / JKPSC / FAA / SI

Input, Output & Peripheral Devices
Complete JKSSB Notes with All PYQs

Complete Theory · Classification · All Device Types · 50+ PYQs · New Statement-Based Pattern

📌 What You Will Learn

This post covers everything JKSSB asks about Input, Output and Peripheral Devices — definitions, classification, every device type with working principle, exam tips, and all PYQs mapped to each topic. Based on pattern analysis of Wildlife Guard (2025), Wildlife Inspector (2026), Junior Assistant, Finance Accounts Assistant, and all Graduate-level JKSSB papers.

// Jump to Section

1. Basics 2. Input Devices 3. Output Devices 4. Printers 5. Scanning Devices 6. Ports 7. All PYQs 8. Practice MCQs

1. What Are Peripheral Devices? — The Basics

A peripheral device is any external hardware device connected to a computer to extend its functionality. The computer itself consists of the CPU + RAM + Motherboard. Everything else — keyboard, mouse, monitor, printer, scanner — is a peripheral.

Peripherals are classified into three broad categories based on their function:

📥 Input Devices

Send data/instructions into the computer. User → Computer. Examples: Keyboard, Mouse, Scanner, Microphone, Webcam, Joystick, Touchpad, OMR, OCR, MICR, Barcode Reader, Light Pen, Digitizer.

📤 Output Devices

Receive processed data from the computer and present it to the user. Computer → User. Examples: Monitor, Printer, Speaker, Projector, Plotter, Headphones.

↔️ Input-Output Devices

Perform both input and output functions. Examples: Touch Screen, Modem, Network Interface Card (NIC), USB Flash Drive, Hard Disk Drive (HDD), Fax Machine.

🎯 JKSSB Exam Tip: The most commonly asked question is 'Which of the following is an input/output/both device?' — always remember: Touch Screen, Modem, NIC, HDD are I/O devices. Printer, Monitor, Speaker are output only. Keyboard, Mouse, Scanner are input only.

2. Input Devices — Complete Coverage

2.1 Keyboard

The keyboard is the most common input device. It converts keystrokes into digital signals sent to the CPU.

Keyboard Type	Description
QWERTY	Standard layout — most widely used worldwide
AZERTY	French keyboard layout
DVORAK	Designed for speed/ergonomics — less common
Virtual Keyboard	On-screen keyboard, used in touchscreen devices
Ergonomic Keyboard	Curved design to reduce strain

🎯 PYQ Fact: A standard keyboard has 104 keys (US layout). The QWERTY layout was designed by Christopher Latham Sholes in 1868. Function keys (F1–F12) perform specific software functions.

2.2 Mouse & Pointing Devices

A pointing device controls the cursor on screen. The mouse was invented by Douglas Engelbart in 1963.

Device	Description
Mechanical Mouse	Uses a rubber ball underneath to detect movement — older technology
Optical Mouse	Uses LED light and optical sensor — most common today
Laser Mouse	Uses laser beam — more precise than optical
Wireless Mouse	Connects via Bluetooth or RF (radio frequency) dongle
Trackball	Stationary device — ball on top moved by thumb/fingers
Touchpad	Built into laptops — fingers slide on pressure-sensitive surface
Joystick	Used in gaming and aircraft simulators — moves in all 4 directions
Light Pen	Pen-shaped device for directly drawing on screen — used in CAD
Digitizer/Graphics Tablet	Used by designers — stylus draws on a flat pad

🎯 PYQ Fact: Joystick has a spherical ball at both its lower and upper ends. It can move in 4 directions. Trackball is like an upside-down mouse. Touchpad is a built-in laptop pointing device — not considered an external peripheral.

2.3 Scanners

Scanners convert physical documents or images into digital form.

Scanner Type	Description
Flatbed Scanner	Most common — document placed face-down on glass plate
Handheld Scanner	Portable — manually moved across document
Drum Scanner	High-quality — used in professional printing
Sheet-fed Scanner	Document fed through rollers — like a fax machine
3D Scanner	Captures three-dimensional objects

2.4 Webcam & Digital Camera

A webcam captures real-time video and images for video calling, streaming, and surveillance. A digital camera captures photographs stored as digital files (JPEG, RAW etc.).

2.5 Microphone

Converts sound (audio) into electrical signals for input into the computer. Used in voice recognition, recording, VoIP calls.

2.6 Touch Screen

A touch screen is both an input and output device. It displays output (like a monitor) and also accepts finger/stylus input. Used in smartphones, ATMs, kiosks, and tablets.

🎯 Key Fact: Touch screens work using different technologies — Resistive (pressure-based, works with any touch), Capacitive (uses electrical charge, requires conductive touch like finger — used in smartphones), and Infrared (uses IR grid).

3. Output Devices — Complete Coverage

3.1 Monitor / Visual Display Unit (VDU)

The monitor is the primary output device — it displays text, graphics, and video. Screen size measured diagonally in inches. Resolution measured in pixels (e.g., 1920×1080 = Full HD).

Monitor Type	Key Characteristics
CRT (Cathode Ray Tube)	Old technology — large, heavy, uses electron gun. Still asked in PYQs!
LCD (Liquid Crystal Display)	Flat, energy-efficient, uses liquid crystals and backlight
LED (Light Emitting Diode)	Type of LCD using LED backlight — thinner, brighter, more common today
OLED (Organic LED)	Each pixel emits its own light — deeper blacks, used in phones/TVs
Plasma	Uses plasma cells for each pixel — found in large TVs
TFT (Thin Film Transistor)	Type of LCD with improved image quality

🎯 PYQ Fact: CRT monitors use an electron gun. LCD uses liquid crystals + backlight. OLED has no backlight — each pixel self-illuminates. Resolution determines sharpness — higher pixels = better quality. A monitor with 1920×1080 pixels = Full HD = 2,073,600 total pixels.

3.2 Speakers & Audio Output

Speakers convert digital electrical signals into sound. Audio output quality depends on the sound card inside the computer. Headphones provide personal audio output.

3.3 Projector

Projects computer output onto a large screen. Used in classrooms, conference rooms, cinema halls. Types: DLP (Digital Light Processing), LCD Projector, LED Projector.

3.4 Plotter

A plotter is a special output device used to print large-scale vector graphics — architectural drawings, engineering blueprints, maps. Unlike printers (which print dots), plotters draw continuous lines using pens.

Plotter Type	Description
Drum Plotter	Paper wrapped around a drum — pen moves horizontally while drum rotates
Flatbed Plotter	Paper is flat — pen moves in X and Y directions over the paper
Inkjet Plotter	Uses inkjet technology for large-format printing

🎯 PYQ Fact: Plotters are used for architectural, engineering, and CAD drawings. They produce high-precision, large-format output. A plotter draws with pens, unlike printers that print dots.

4. Printers — Most Frequently Asked in JKSSB

Printers are the most-tested output device topic in JKSSB Computer section. They are classified into two main categories based on whether the print head physically touches the paper.

Impact Printers (Physical Contact)

The print head physically strikes a ribbon against paper to form characters. Works like a typewriter. Louder, slower, but can print on multi-copy carbon paper.

• Dot Matrix Printer
• Daisy Wheel Printer
• Chain/Band Printer
• Drum Printer
• Line Printer

Non-Impact Printers (No Contact)

Print head does NOT touch the paper. Use ink, laser, or heat to form images. Quieter, faster, better quality. Cannot print multi-copy carbon paper.

• Inkjet Printer
• Laser Printer
• Thermal Printer
• Electrostatic Printer
• 3D Printer

Printer	Type	Working & Key Facts
Dot Matrix	Impact	Pins on print head strike ribbon → forms dots → characters. Cheapest. Used for bills/receipts. Speed: 30–600 CPS (characters per second)
Daisy Wheel	Impact	Wheel with characters embossed on petals. High-quality text but slow. Cannot print graphics. Speed: 25–55 CPS
Line Printer	Impact	Prints one full line at a time. Very fast. Used in large mainframe computers. Speed: 600–1200 LPM
Drum Printer	Impact	Characters on a rotating drum. Fast — used in mainframes
Inkjet	Non-Impact	Sprays tiny ink droplets onto paper. Good for photos. Home use. Resolution: 300–1200 DPI
Laser	Non-Impact	Uses laser beam + electrostatic charge + toner powder. Fastest, best quality text. Office standard. Speed: 4–20+ PPM
Thermal	Non-Impact	Uses heat to create image on special heat-sensitive paper. Used in ATMs, POS billing, fax machines. No ink needed
3D Printer	Non-Impact	Creates 3D physical objects layer by layer from digital designs using plastic/resin/metal

🎯 JKSSB Exam Tips on Printers:
• Dot Matrix = Impact, cheapest, used for multi-copy billing
• Daisy Wheel = Impact, high quality text, cannot print graphics
• Laser = Fastest, best quality, most common in offices
• Thermal = No ink, used in ATMs and billing machines
• Inkjet = Best for colour photos at home
• Speed measured in: CPS (Character Per Second) for impact, PPM (Pages Per Minute) for laser/inkjet, LPM (Lines Per Minute) for line printers
• Quality measured in: DPI (Dots Per Inch)

5. Special Input Devices — OMR, OCR, MICR, BCR

These are specialised input devices used to read specific types of data — marks, text, magnetic ink, and barcodes. JKSSB asks at least 2–3 questions from this category in every exam.

Device	Full Name	Working & Uses	Exam Status
OMR	Optical Mark Recognition/Reader	Detects and reads pencil/pen marks in predefined positions. Used for: Exam answer sheets (MCQ checking), voting forms, surveys. Cannot read handwriting — only marks in boxes.	JKSSB PYQ Favourite ⭐
OCR	Optical Character Recognition	Reads and converts printed/handwritten text into editable digital text. Used for: Converting scanned documents to Word/PDF, reading book pages. ABBYY FineReader, Adobe Acrobat — OCR software.	Asked in PYQs
MICR	Magnetic Ink Character Recognition	Reads characters printed with magnetic ink. Used in: Banking — reading cheque numbers, account numbers, bank codes at bottom of cheques. Characters look like blocky fonts.	Bank/Cheque context ⭐
BCR (Barcode Reader)	Barcode Reader	Uses laser to read barcodes (series of vertical black/white lines). Used for: Supermarket billing, inventory management, library books, product tracking.	Common in PYQs
QR Code Reader	Quick Response Code	Reads 2D QR codes using camera. Stores more data than barcode. Used for: Payments, URLs, tickets, menus.	Newer format
Magnetic Stripe Reader	Magstripe Reader	Reads magnetic stripe on back of debit/credit cards. The stripe contains iron-based particles in plastic tape.	Card swiping machines

🎯 Critical Differences for JKSSB:
• OMR = Only reads MARKS (pen/pencil circles) — used for answer sheets
• OCR = Reads actual TEXT (letters, numbers) — converts to editable format
• MICR = Reads MAGNETIC INK — only used in banking/cheques
• Barcode Reader = Reads 1D barcodes (lines) — used in shopping/inventory
• QR Code = 2D version of barcode — stores more data
• OMR cannot read handwriting. MICR uses special magnetic ink not regular ink.

6. Computer Ports & Interfaces

A port is a physical connection point on a computer that allows peripheral devices to be connected. Ports are essential connectors between the CPU and external devices.

Port	Description	Used For
USB (Universal Serial Bus)	Most common port. USB 2.0 (480 Mbps), USB 3.0 (5 Gbps — blue), USB 3.1 (10 Gbps), USB-C (reversible). Supports hot-plugging (connect/disconnect without restart).	Keyboard, Mouse, Pen Drive, Printer
HDMI (High-Definition Multimedia Interface)	Transmits both audio and video digitally in high definition. Standard for TVs, monitors, projectors.	Monitor, TV, Projector
VGA (Video Graphics Array)	Older analog video port (15-pin D-sub connector). No audio. Being replaced by HDMI/DisplayPort.	Older Monitors, Projectors
DisplayPort	Digital video and audio — higher bandwidth than HDMI. Used in high-refresh-rate gaming monitors.	High-end Monitors
PS/2	Circular 6-pin port. Purple = Keyboard, Green = Mouse. Older technology, replaced by USB.	Old Keyboards, Old Mice
Serial Port (COM Port)	Transmits data one bit at a time. Older 9-pin or 25-pin connector. Used for modems and old printers.	Old Modems, Printers
Parallel Port (LPT Port)	Transmits data 8 bits simultaneously. 25-pin female connector. Used for printers — called 'printer port'.	Old Printers
Audio Jack (3.5mm)	Analog audio connection. Green = Speaker/Headphone output, Pink = Microphone input, Blue = Line in.	Speakers, Headphones, Mic
Ethernet (RJ-45)	Network port for wired LAN connection. Also called RJ-45 port.	LAN Cable, Network
Thunderbolt	High-speed data + video + power. Thunderbolt 3 = USB-C shape. Intel + Apple standard.	Laptops, External Drives

🎯 JKSSB Port Facts:
• USB 3.0 = Blue coloured port
• PS/2 Purple = Keyboard | PS/2 Green = Mouse
• Parallel port = Printer port (25-pin)
• Serial port = COM port (9 or 25 pin)
• HDMI = Audio + Video together
• VGA = Video only, analog, no audio
• RJ-45 = Ethernet/LAN port (network)

7. All JKSSB PYQs — Input/Output & Peripheral Devices

These are actual questions asked in JKSSB examinations across various posts — Junior Assistant, Finance Accounts Assistant (FAA), Wildlife Guard/Inspector, Panchayat Secretary, Accounts Assistant, SI (Finance), and Graduate-level exams.

Q1. JKSSB Graduate Level PYQ

Which of the following is an example of an Input Device?

A) Monitor

B) Printer

C) Scanner ✅

D) Speaker

Answer: C — Scanner converts physical documents into digital data — it is an input device. Monitor, Printer, and Speaker are all output devices.

Q2. JKSSB Junior Assistant PYQ

Which of the following is an Output Device?

A) Keyboard

B) Mouse

C) Printer ✅

D) Microphone

Answer: C — Printer produces output on paper — it is an output device. Keyboard, Mouse, and Microphone are all input devices.

Q3. JKSSB FAA PYQ

Optical Mark Reader (OMR) is used for:

A) Reading text from printed pages

B) Reading marks made by pen or pencil in predefined positions ✅

C) Reading magnetic ink characters on cheques

D) Reading barcodes on products

Answer: B — OMR detects and reads marks (circles/bubbles) made by pen/pencil — used primarily for checking MCQ answer sheets in examinations.

Q4. JKSSB Accounts Assistant PYQ

MICR stands for:

A) Magnetic Ink Character Recognition ✅

B) Magnetic Ink Character Reader

C) Manually Inputted Character Recognition

D) Mechanically Inserted Character Reader

Answer: A — MICR = Magnetic Ink Character Recognition. It reads characters printed with magnetic ink — used in banking for reading cheque details.

Q5. JKSSB Graduate Level PYQ

Which of the following devices is used primarily in banking for reading cheques?

A) OMR

B) OCR

C) MICR ✅

D) BCR

Answer: C — MICR (Magnetic Ink Character Recognition) is specifically used in banking to read the account numbers, cheque numbers and bank codes printed at the bottom of cheques using magnetic ink.

Q6. JKSSB Panchayat Secretary PYQ

A Joystick is primarily used as a _____ device.

A) Output

B) Storage

C) Input ✅

D) Processing

Answer: C — A joystick is an input device used for gaming and simulators. It sends directional input (up, down, left, right) to the computer.

Q7. JKSSB Wildlife Inspector 2026 PYQ

Which printer type uses physical impact of pins striking an ink ribbon to create characters?

A) Laser Printer

B) Inkjet Printer

C) Dot Matrix Printer ✅

D) Thermal Printer

Answer: C — Dot Matrix Printer is an impact printer — it uses pins on a print head that strike an ink ribbon against paper to form characters made of dots.

Q8. JKSSB FAA PYQ

Which of the following printers produces the best quality printout and is fastest?

A) Dot Matrix

B) Daisy Wheel

C) Inkjet

D) Laser ✅

Answer: D — Laser printers use laser beam + electrostatic charge + toner powder — they produce the highest quality text and are the fastest printers commonly used in offices.

Q9. JKSSB Junior Assistant PYQ

A Thermal Printer:

A) Uses ink cartridges

B) Uses a laser beam and toner

C) Requires special heat-sensitive paper and uses heat to print ✅

D) Strikes an ink ribbon

Answer: C — Thermal printers use heat to create images on special heat-sensitive paper. They do not require ink or toner. Used in ATM receipts, billing counters, and old fax machines.

Q10. JKSSB Graduate Level PYQ

The Daisy Wheel Printer:

A) Can print graphics

B) Is a non-impact printer

C) Cannot print graphics, only text characters ✅

D) Uses laser technology

Answer: C — Daisy Wheel printers are impact printers — they use a wheel with embossed characters. They produce high-quality text but CANNOT print graphics because characters are pre-formed on the wheel.

Q11. JKSSB Panchayat Secretary PYQ

Which of the following is both an Input and Output device?

A) Keyboard

B) Monitor

C) Touch Screen ✅

D) Scanner

Answer: C — A Touch Screen displays output (like a monitor) AND accepts user input via touch. It is therefore BOTH an input and output device. Keyboard = Input only. Monitor = Output only. Scanner = Input only.

Q12. JKSSB Graduate Level PYQ

CRT stands for:

A) Computer Ray Tube

B) Cathode Ray Tube ✅

C) Cathode Resolution Terminal

D) Computer Resolution Technology

Answer: B — CRT = Cathode Ray Tube. It is the older monitor technology that uses an electron gun to fire electrons at a phosphor-coated screen.

Q13. JKSSB FAA PYQ PYQ

Which port on a computer is commonly called the 'Printer Port'?

A) Serial Port

B) USB Port

C) Parallel Port ✅

D) PS/2 Port

Answer: C — The Parallel Port (also called LPT port — Line Printer Terminal) is a 25-pin female connector traditionally used to connect printers. It transmits 8 bits simultaneously and is called the 'printer port'.

Q14. JKSSB Graduate Level PYQ

A Plotter is used for:

A) Playing audio files

B) Printing large architectural and engineering drawings ✅

C) Scanning documents

D) Storing data

Answer: B — A plotter is a specialised output device for printing large-format vector graphics like architectural drawings, engineering blueprints, maps and CAD designs. It draws with pens, unlike regular printers that print dots.

Q15. JKSSB Accounts Assistant PYQ

OCR technology is used to:

A) Read marks on answer sheets

B) Recognise and convert printed text into editable digital text ✅

C) Read magnetic ink on cheques

D) Read barcodes on products

Answer: B — OCR = Optical Character Recognition. It recognises printed, typed or handwritten text and converts it into machine-readable/editable digital format. ABBYY FineReader and Adobe Acrobat are common OCR tools.

Q16. JKSSB Junior Assistant PYQ

USB 3.0 ports are identified by their:

A) Yellow colour

B) Red colour

C) Blue colour ✅

D) Green colour

Answer: C — USB 3.0 ports are coloured BLUE to distinguish them from USB 2.0 ports (which are black or white). USB 3.0 has a data transfer speed of up to 5 Gbps.

Q17. JKSSB Wildlife Guard PYQ

Which of the following is NOT an impact printer?

A) Dot Matrix Printer

B) Daisy Wheel Printer

C) Laser Printer ✅

D) Line Printer

Answer: C — Laser Printer is a NON-impact printer — it uses laser beam + electrostatic technology + toner powder. Dot Matrix, Daisy Wheel, and Line Printers are all impact printers.

Q18. JKSSB FAA PYQ

Trackball is a pointing device that is:

A) Moved across a pad to control cursor

B) Stationary — the ball on top is rotated by hand to control cursor ✅

C) Built into laptops

D) Used only for gaming

Answer: B — A Trackball is stationary — unlike a mouse, the device itself does not move. The user rolls the ball on top with their thumb or fingers to control the cursor. Used as a mouse replacement.

Q19. JKSSB Graduate Level PYQ

HDMI port is used to transmit:

A) Only video signal

B) Only audio signal

C) Both audio and video signal digitally ✅

D) Only data files

Answer: C — HDMI (High-Definition Multimedia Interface) transmits BOTH high-definition video AND audio through a single cable digitally. It is the standard for connecting computers to modern monitors, TVs and projectors.

Q20. JKSSB Accounts Assistant PYQ

The VGA port on a computer:

A) Transmits both audio and video

B) Is a digital connection

C) Is an analog video connection only — no audio ✅

D) Replaced HDMI

Answer: C — VGA (Video Graphics Array) is an ANALOG video-only connection. It does NOT carry audio. It uses a 15-pin D-sub connector. VGA is an older standard being replaced by HDMI and DisplayPort.

8. New Statement-Based Pattern Practice MCQs

Based on the new JKSSB 2026 exam pattern (Wildlife Inspector, Wildlife Guard, FAA expected format), these are statement-based questions that require evaluating multiple facts simultaneously — exactly as asked in recent exams.

Q1. JKSSB New Pattern — Statement Based NEW PATTERN

Which of the following statements about Dot Matrix Printers are CORRECT?

I. Dot Matrix is an impact printer where print head pins strike an ink ribbon.

II. Dot Matrix printers can be used to print on multi-copy carbon paper.

III. Dot Matrix printers are faster than Laser printers.

IV. The speed of Dot Matrix printers is measured in PPM (Pages Per Minute).

A) I and II only ✅

B) I, II and III only

C) I only

D) All of the above

Answer: A — Statements I and II are correct — Dot Matrix is impact and works on carbon paper. Statement III is WRONG (Laser is faster). Statement IV is WRONG — Dot Matrix speed is measured in CPS (Characters Per Second), not PPM.

Q2. JKSSB New Pattern — Statement Based NEW PATTERN

Identify the CORRECT statements about OMR and OCR:

I. OMR reads marks (circles/bubbles) made by pen or pencil.

II. OCR can convert printed text into editable digital format.

III. OMR can read handwritten text.

A) I only

B) III only

C) I and II only ✅

D) All of the above

Answer: C — Statements I and II are correct. Statement III is WRONG — OMR can only detect marks in predefined positions, NOT read handwriting. OCR reads text characters; OMR only detects marks.

Q3. JKSSB New Pattern — Statement Based NEW PATTERN

Which of the following statements about computer ports are CORRECT?

I. USB 3.0 ports are identified by their blue colour.

II. The Parallel Port is also called the Printer Port.

III. HDMI transmits only video, not audio.

IV. PS/2 Purple port is used for Mouse.

A) I and II only ✅

B) I, II and III only

C) I, II and IV only

D) All of the above

Answer: A — Statements I and II are correct. Statement III is WRONG — HDMI transmits BOTH audio and video. Statement IV is WRONG — PS/2 Purple = KEYBOARD, PS/2 Green = MOUSE.

Q4. JKSSB Wildlife Inspector Pattern — Statement Based NEW PATTERN

Consider the following statements about printers and select the INCORRECT ones:

I. Daisy Wheel printers can print both text and graphics.

II. Thermal printers use heat-sensitive paper and require no ink.

III. Laser printers are non-impact printers.

IV. Inkjet printers are faster than Laser printers.

A) I and IV only ✅

B) II and III only

C) I only

D) III and IV only

Answer: A — Statements I and IV are INCORRECT. Daisy Wheel CANNOT print graphics (it has pre-formed character wheels). Inkjet printers are SLOWER than Laser printers. Statements II and III are correct.

Q5. JKSSB New Pattern — Statement Based NEW PATTERN

Which of the following statements about Touch Screens are CORRECT?

I. A Touch Screen is both an Input and an Output device.

II. Capacitive touch screens work with any material including gloved hands.

III. Resistive touch screens respond to pressure and work with any touch including a stylus.

A) I only

B) I and III only ✅

C) I and II only

D) All of the above

Answer: B — Statements I and III are correct. Touch Screen is both I/O. Resistive screens respond to pressure — work with fingers, gloves, and stylus. Statement II is WRONG — Capacitive screens require a conductive touch (bare finger); they do NOT work with regular gloves or non-conductive stylus.

Q6. JKSSB Statement Pattern — Statement Based NEW PATTERN

Match the following devices with their correct category and select the right option:

I. OMR — reads marks on answer sheets

II. MICR — used in banking to read cheque details

III. OCR — converts printed text to editable format

IV. Barcode Reader — reads product codes in supermarkets

A) Only I and II are correct

B) Only I, II and III are correct

C) All four are correct ✅

D) Only II and IV are correct

Answer: C — ALL four statements are correct. OMR → answer sheets. MICR → banking/cheques. OCR → text to digital. Barcode Reader → product scanning in supermarkets.

⚡ Quick Revision — Most Exam-Tested Facts

Input vs Output vs Both

• Input: Keyboard, Mouse, Scanner, Mic, Webcam, Joystick, OMR, OCR, MICR
• Output: Monitor, Printer, Speaker, Projector, Plotter
• Both: Touch Screen, Modem, HDD, NIC, USB Drive, Fax

Printers Summary

• Impact: Dot Matrix, Daisy Wheel, Line, Drum, Chain
• Non-Impact: Laser, Inkjet, Thermal, 3D
• Fastest: Laser | Cheapest: Dot Matrix
• ATM/Bills: Thermal | Photos: Inkjet
• No graphics: Daisy Wheel

Special Readers

• OMR → Answer sheets (marks only)
• OCR → Text to editable digital
• MICR → Banking, cheques
• Barcode → Supermarkets, inventory
• QR Code → Payments, URLs

Ports

• USB 3.0 = Blue
• Parallel = Printer port (25-pin)
• PS/2 Purple = Keyboard, Green = Mouse
• HDMI = Audio + Video
• VGA = Video only, analog
• RJ-45 = Ethernet/LAN

Tags

#JKSSB#ComputerNotes#InputDevices#OutputDevices#PeripheralDevices#OMR#OCR#MICR#Printers#JKPSC#FAA2026#JuniorAssistant#JKEdusphere#ComputerAwareness#Keyboard#Mouse#Ports