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WorksheetsKeyboard and Input Devices Quiz
Total questions: 15
Worksheet time: 8mins
What component in a keyboard stores the map from key positions to character codes?
RAM on the PC
CPU cache
On-keyboard ROM
GPU memory
How does a keyboard detect which key is pressed?
Individual wire per key
Random polling
Row–column matrix closing a circuit
Optical camera inside
Which statement about a GUI and pointing device is true?
GUI removes the need for input
A mouse enables selection/control of on-screen icons
GUI only works with touch
GUI is output-only
Resistive touch screens detect touches by…
Magnetic flux
Two layers contacting to form voltage dividers
Infrared beams
Ultrasonic echoes
Projected capacitive touch (PCT) enables multi-touch primarily because…
It scans with a laser
It uses mutual capacitance across a sensor grid
It measures air pressure
It uses microphones
In a flatbed scanner, what device turns reflected light into an electrical signal?
LED bar
Thermistor
CCD
Laser diode
Why does a scanner need an ADC?
To amplify analog noise
To digitize analog signals from the CCD
To display color profiles
To store files in RAM
A pixel on a screen is typically composed of…
One white sub-pixel
Three RGB sub-pixels
Two CM sub-pixels
Four CMYK sub-pixels
How does a CRT create an image?
Liquid crystals rotate light
Electrons strike a phosphor screen guided by electromagnets
Polarizers block light
Micro-LEDs emit light directly
In an LCD, applying voltage to a cell primarily…
Heats the pixel
Changes liquid crystal alignment and thus polarization
Moves the phosphor
Fires electrons
Which statement about a VR headset is accurate?
It is only an audio device
It immerses users in a 3D computer-generated environment
It projects images onto paper
It cannot track head movement
Inkjet printers create images by…
Melting plastic
Spraying tiny droplets of ink from nozzles onto paper
Etching toner with acid
Exposing photo paper to light
In a laser printer, toner sticks to…
Electrically discharged areas on the drum
Heated paper only
The laser mirror
Uncharged paper fibers
A graphic plotter is best suited for…
Printing photo-realistic bitmaps
Drawing precise vector line work with pens
Melting filament layer by layer
Projecting images on walls
In audio I/O, where is a DAC used?
Converting microphone voltage to samples
Converting digital audio to an analog signal for speakers
Compressing a file to MP3
Beamforming in cameras
