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GK One-Line Question & Answer

15541+ short questions with short answers, covering every category and sub-category on the site — no long articles to scroll through. Good for a fast recap before an exam, or a few minutes of daily practice.

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Computer Fundamentals → Introduction to Computer 26

Projector lumen rating measures?
Brightness of projected image
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DLP projector technology uses?
Millions of tiny mirrors (Digital Micromirror Device)
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Laser projector uses?
Laser diodes as light source
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What does CMYK stand for in printing?
Cyan Magenta Yellow Black
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RGB is used for?
Screen/display color (additive)
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Screen printing uses?
Mesh/stencil to push ink through onto substrate
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Which display port can carry both video AND power?
USB-C (DisplayPort Alt Mode)
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Holographic display creates?
3D images visible without special glasses
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Electronic whiteboard (smartboard) combines?
Interactive display and input device
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Head-mounted display (HMD) is used for?
VR/AR immersive experiences
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Binaural audio is designed to?
Create 3D spatial sound through headphones
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Noise-cancelling headphones use?
Microphones + anti-phase signals to cancel ambient noise
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Which output is produced by a text-to-speech (TTS) system?
Synthesized audio speech from text
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Screen reader software provides output via?
Audio speech and/or Braille display
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Aspect ratio 16:9 refers to?
Width to height ratio of 16:9
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Color depth of 24-bit display can show?
16,777,216 colors
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Pixel density (PPI) measures?
Pixels per inch of display
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Apple's Retina Display name indicates?
PPI high enough that individual pixels are indistinguishable at normal viewing distance
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HBM (High Bandwidth Memory) is used in?
High-performance GPU and AI accelerators
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Which memory type uses stacked dies for high density?
3D NAND Flash
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TLC NAND stores how many bits per cell?
3
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SLC NAND stores how many bits per cell?
1
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QLC NAND stores how many bits per cell?
4
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Write endurance of NAND flash is measured in?
Program/Erase (P/E) cycles
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TRIM command in SSDs?
Informs SSD which blocks are no longer in use for efficient garbage collection
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Over-provisioning in SSDs refers to?
Setting aside reserved NAND capacity for garbage collection and wear leveling
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Computer Fundamentals → Output Devices 12

LCD projector transmits light through?
Liquid crystal panels modulating light
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Which type of printer uses electrostatic charge to attract toner?
Laser
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Braille printer (embosser) creates?
Raised dots on paper for visually impaired users
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Wide-format printer is also called?
Large-format or plotter printer
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Thermal transfer printer uses?
Heat to melt ink from ribbon onto paper/label
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Direct thermal printer vs thermal transfer: direct thermal?
Prints by heat-activating chemically treated paper
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UV printer cures ink using?
Ultraviolet light instantly
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Sublimation printer is used for?
Printing on fabric/mugs using heat-transfer dye
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Plotter pen speed is measured in?
IPS (inches per second)
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Which output device shows data on a non-volatile display?
E-ink (maintains display without power)
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Which output device is used in digital signage?
Commercial-grade LCD/LED display panels
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Which printer type is used in point-of-sale receipt printing?
Thermal (direct thermal)
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Computer Fundamentals → Memory Units 2

Which memory technology provides byte-level addressability like RAM but retains data like flash?
3D XPoint (Intel Optane)
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Wear leveling in SSD ensures?
Even distribution of writes across all cells to maximize lifespan
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