1. An optical mouse detects movement using:
- magnetic ink
- a rubber ball
- an LED light and sensor
- a laser printer
Answer: C) an LED light and sensor
Explanation: Optical mice track the surface using light.
MCQs / Computer Science / Input and Output Devices
Input and Output Devices MCQs — Computer Science
48 multiple-choice questions on Input and Output Devices from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
2. A device that projects the computer screen onto a wall for a class is a:
- scanner
- webcam
- plotter
- multimedia projector
Answer: D) multimedia projector
Explanation: Projectors enlarge the display.
3. Arrow keys, Home and Page Down belong to:
- cursor / navigation keys
- alphanumeric keys
- function keys
- numeric keypad only
Answer: A) cursor / navigation keys
Explanation: They move the cursor on the screen.
4. Which device is both an input and an output device?
- Scanner
- Keyboard
- Printer
- Touchscreen
Answer: D) Touchscreen
Explanation: A touchscreen displays output and accepts touch input.
5. Which monitor type consumes the most power and generates heat?
- CRT
- LCD
- OLED
- LED
Answer: A) CRT
Explanation: CRT technology is power-hungry.
6. 3-D printers produce:
- solid objects layer by layer
- maps on paper only
- cheque numbers
- sounds
Answer: A) solid objects layer by layer
Explanation: 3-D printers build physical objects.
7. Which key is commonly used to get Help in most programs?
- F12
- F5
- Esc
- F1
Answer: D) F1
Explanation: F1 opens Help in most applications.
8. MICR stands for:
- Machine Ink Coding Recognition
- Micro Input Character Reader
- Magnetic Input Code Reader
- Magnetic Ink Character Recognition
Answer: D) Magnetic Ink Character Recognition
Explanation: MICR reads characters printed with magnetic ink.
9. A microphone is a(n):
- storage device
- input device
- processing device
- output device
Answer: B) input device
Explanation: It inputs sound into the computer.
10. Which component converts digital audio into analog signals for speakers?
- Hard disk
- Sound card
- Network card
- Graphics card
Answer: B) Sound card
Explanation: The sound card handles audio input/output.
11. ATM slips and shop receipts are usually printed by:
- plotters
- daisy-wheel printers
- thermal printers
- line printers
Answer: C) thermal printers
Explanation: Thermal printers use heat-sensitive paper.
12. In a flatbed plotter:
- only sound is produced
- the paper rotates on a drum
- the paper is fixed on a flat surface and the pens move
- no pens or ink are used
Answer: C) the paper is fixed on a flat surface and the pens move
Explanation: Flatbed plotters keep paper stationary.
13. Speakers are:
- processing devices
- input devices
- storage devices
- output devices
Answer: D) output devices
Explanation: They produce sound output.
14. Laser printer speed is commonly measured in:
- lines per hour
- pages per minute (ppm)
- frames per second
- characters per second
Answer: B) pages per minute (ppm)
Explanation: ppm is used for page printers.
15. Fingerprint and iris scanners are examples of:
- storage devices
- biometric devices
- impact printers
- output devices
Answer: B) biometric devices
Explanation: They identify people by body features.
16. In a drum plotter the paper:
- is magnetic
- moves on a rotating drum
- is not used
- stays fixed while pens move only
Answer: B) moves on a rotating drum
Explanation: The drum rolls the paper back and forth.
17. A display on screen is called:
- soft copy
- hard copy
- carbon copy
- printout
Answer: A) soft copy
Explanation: Screen output is temporary – soft copy.
18. A device used at shop counters to read product codes is a:
- barcode reader
- plotter
- MICR
- light pen
Answer: A) barcode reader
Explanation: Barcode readers are common at POS terminals.
19. The M-Tag on Pakistan's motorways is read by a(n):
- RFID reader
- light pen
- plotter
- OMR
Answer: A) RFID reader
Explanation: M-Tag uses radio-frequency identification.
20. The smallest dot that makes up an image on the screen is a:
- dpi
- bit
- pixel
- sector
Answer: C) pixel
Explanation: Pixel = picture element.
21. Which monitor is bulky, heavy and uses an electron gun?
- OLED
- LED
- LCD
- CRT
Answer: D) CRT
Explanation: CRT monitors fire electron beams at the screen.
22. The most common keyboard layout is:
- DVORAK only
- AZERTY only
- ABCDEF
- QWERTY
Answer: D) QWERTY
Explanation: QWERTY is named after the first six letters on the top row.
23. OCR converts:
- marks into grades directly
- scanned printed text into editable text
- sound into text
- images into sound
Answer: B) scanned printed text into editable text
Explanation: Optical Character Recognition reads characters from images.
24. Inkjet printers print by:
- using magnetic ink only
- burning paper
- spraying tiny drops of ink
- striking a ribbon
Answer: C) spraying tiny drops of ink
Explanation: Nozzles spray ink onto paper.
25. A pen-shaped device that detects light from the screen to select or draw is a:
- stylus on paper
- plotter
- light pen
- barcode reader
Answer: C) light pen
Explanation: A light pen works directly on the screen.
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Practise Input and Output Devices MCQs
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