ACARA Digital Technologies Years 7–8 Word Scramble: Representing Text, Images and Sound (Modules 153–172)
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Word scramble
Unscramble the letters and write each key term on the line.
1
REOPEDPREY
A tool that picks one pixel in an image and shows the red, green and blue numbers (0 to 255) stored for it, such as rgb(255, 0, 0) for pure red.
2
TB-2I4 UOOLCR
Each pixel uses 8 bits for red, 8 for green and 8 for blue. That is 3 bytes (24 bits) per pixel, giving 256 x 256 x 256 = about 16.7 million possible colours.
3
OVERCT MGAEI
An image stored as shapes and paths (lines, curves) described by numbers and drawn when shown, not as a grid of pixels. It can scale up without pixelation. SVG is a common format.
4
SRERTA SV OTCERV
Raster images store a colour number for every pixel and blur when enlarged; vector images store shape instructions and stay sharp at any size.
5
VRMFAWEO
A graph of a sound. Time runs left to right and volume goes up and down. Louder sounds make taller waves and silence is a flat line.
6
EMASPL
One measurement of a sound wave's volume at a single moment in time, stored as one whole number. Many samples taken at equal time steps are dots on the waveform.
7
PMELSA UCEEQNES
An ordered list of whole numbers, each measuring a sound's volume at a regular time. Plot them in order and join the dots to redraw an approximation of the wave.
8
VLEELS = N^2
A sample resolution of n bits gives 2^n volume levels, so each extra bit doubles the levels. 8 bits give 256 levels and 16 bits give 65,536. Fewer levels means more rounding.
9
ITB ARTE
The number of bits used to store each second of sound: sample rate x sample resolution. A higher ______ means better accuracy but more storage per second.
Answer Key
ACARA Digital Technologies Years 7–8 · Modules 153–172
1REOPEDPREY → eyedropper — A tool that picks one pixel in an image and shows the red, green and blue numbers (0 to 255) stored for it, such as rgb(255, 0, 0) for pure red.
2TB-2I4 UOOLCR → 24-bit colour — Each pixel uses 8 bits for red, 8 for green and 8 for blue. That is 3 bytes (24 bits) per pixel, giving 256 x 256 x 256 = about 16.7 million possible colours.
3OVERCT MGAEI → vector image — An image stored as shapes and paths (lines, curves) described by numbers and drawn when shown, not as a grid of pixels. It can scale up without pixelation. SVG is a common format.
4SRERTA SV OTCERV → raster vs vector — Raster images store a colour number for every pixel and blur when enlarged; vector images store shape instructions and stay sharp at any size.
5VRMFAWEO → waveform — A graph of a sound. Time runs left to right and volume goes up and down. Louder sounds make taller waves and silence is a flat line.
6EMASPL → sample — One measurement of a sound wave's volume at a single moment in time, stored as one whole number. Many samples taken at equal time steps are dots on the waveform.
7PMELSA UCEEQNES → sample sequence — An ordered list of whole numbers, each measuring a sound's volume at a regular time. Plot them in order and join the dots to redraw an approximation of the wave.
8VLEELS = N^2 → levels = 2^n — A sample resolution of n bits gives 2^n volume levels, so each extra bit doubles the levels. 8 bits give 256 levels and 16 bits give 65,536. Fewer levels means more rounding.
9ITB ARTE → bit rate — The number of bits used to store each second of sound: sample rate x sample resolution. A higher bit rate means better accuracy but more storage per second.