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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 → Input Devices 6

Scroll wheel on a mouse generates which type of input?
Relative rotation/scroll amount
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Which keyboard technology uses light beams to detect keystrokes?
Optical keyboard
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Braille input device is used by?
Visually impaired users
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Steering wheel input device is used in?
Automotive driving simulators and games
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Dance pad/floor mat is which type of input device?
Body motion input device
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Which input device reads utility meters remotely?
AMR (Automatic Meter Reading) device
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Computer Fundamentals → Introduction to Computer 28

Multi-touch gesture 'pinch to zoom' requires minimum how many fingers?
2
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Eye-tracking input system works by?
Tracking pupil/iris movement using infrared cameras
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Which technology allows input by detecting skin conductance?
Galvanic skin response sensors
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Magnetic card reader reads data from?
Magnetic stripe using magnetic sensor
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Smart card uses which technology for data storage?
Embedded microchip
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EMV chip in credit cards stands for?
Europay Mastercard Visa
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Which peripheral converts handwriting to digital text in real time?
Digital pen with recognition software
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Biometric passport uses which input technology?
RFID chip with biometric data
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Which input sensor measures atmospheric pressure?
Barometer/barometric sensor
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Gyroscope sensor in smartphones detects?
Rotational orientation
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Accelerometer in smartphones detects?
Linear acceleration/motion
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Magnetometer in smartphones is used as?
Digital compass
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Ambient light sensor adjusts?
Screen brightness automatically
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Proximity sensor in smartphones detects?
Whether device is near face (turns off screen during calls)
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Mini-LED display technology uses?
Thousands of small LEDs for local dimming
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Which display has the fastest response time?
TN LCD
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G-Sync and FreeSync technologies are used for?
Synchronizing monitor refresh rate with GPU frame rate (anti-tearing)
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4K UHD resolution has how many pixels?
8294400
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8K resolution is?
7680 × 4320
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HDR (High Dynamic Range) in displays improves?
Contrast and color range
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Color gamut sRGB vs DCI-P3: DCI-P3 is?
Wider color space used in cinema/professional displays
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Electronic paper (E-ink) displays are suitable for?
Reading static text with low power consumption
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In laser printing, the laser beam is used to?
Discharge selected areas on the drum
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Fuser unit in laser printer?
Permanently bonds toner to paper using heat and pressure
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Which ink type in inkjet printers is water-resistant?
Pigment-based
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FDM 3D printing stands for?
Fused Deposition Modeling
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SLA 3D printing uses?
UV laser to cure liquid photopolymer resin
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Surround sound 5.1 system has?
5 speakers + 1 subwoofer
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Computer Fundamentals → Output Devices 6

Which monitor technology offers true blacks (no backlight bleed)?
OLED
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Curved monitor benefits include?
Reduced eye strain and more immersive viewing
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Laser printer drum is charged using?
Corona wire/primary charge roller
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Inkjet printer resolution is typically measured in?
DPI (dots per inch)
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3D printer creates objects by?
Adding material layer by layer (additive manufacturing)
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Which audio output device converts digital to analog for headphones?
DAC (Digital-to-Analog Converter)
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