ACARA Digital Technologies Years 7–8 Crossword: Representing Text, Images and Sound and Binary Number Representation (Modules 173–188)
Name:
Date:
Class:
✎
Crossword
Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.
1
2
3
4
5
6
7
8
9
Across
- 2. Word 3 of the term in 1 Down: ____ -> numbers -> ______ (6)
- 4. Zooming far into a waveform in an audio editor like Audacity shows each sample as a dot. A higher project rate gives more dots every second, so the wave is drawn more smoothly. Word 4 of: Zoom in to _______ (7)
- 6. Word 1 of the term in 2 Down: _______ ____-10, ______ ____-2 (7)
- 7. Binary place values: 1, 2, 4, 8, 16, 32, 64, 128 and so on. Each place is double the one before it, which is why binary is called base 2. Word 1 of: ______ of 2 (6)
- 9. ______ turns text, images and sound into whole numbers (character codes, RGB pixel values, sound samples), then stores each number as binary 0s and 1s. (8)
Down
- 1. Name the data ______, say which numbers represent it, then show how they become ______. Give a short example for each, e.g. A is 65 because of ASCII, and 65 is 01000001. Word 1 of: ____ -> numbers -> ______ (4)
- 2. ______ is ______-10 and uses ten digits, 0 to 9. Binary is ______-2 and uses only 0 and 1. People use ______ every day, but computers use binary. Word 2 of: _______ ____-10, ______ ____-2 (4)
- 3. Find the smallest ______ of bits n whose largest value, 2^n - 1, is at least your ______. Example: 20 is too big for 4 bits (max 15), so it needs 5 bits (max 31). Word 4 of: 2^n - 1 >= ______ (6)
- 5. A ______ with only two possible conditions, like a light switch being off or on. We write the two states as 0 and 1, which is the idea behind binary. Word 2 of: two-_____ ______ (5)
- 8. Word 3 of the term in 5 Down: two-_____ ______ (6)
Answer Key
ACARA Digital Technologies Years 7–8 · Modules 173–188
1T
2B
I
3N
A
R
Y
A
U
P
4S
A
M
P
L
E
5S
E
B
T
6D
E
C
I
M
A
L
R
T
7P
O
W
E
R
8S
Y
S
T
9E
N
C
O
D
I
N
G
M
Across
2BINARY — Word 3 of the term in 1 Down: ____ -> numbers -> ______
4SAMPLES — Zooming far into a waveform in an audio editor like Audacity shows each sample as a dot. A higher project rate gives more dots every second, so the wave is drawn more smoothly. Word 4 of: Zoom in to _______
6DECIMAL — Word 1 of the term in 2 Down: _______ ____-10, ______ ____-2
7POWERS — Binary place values: 1, 2, 4, 8, 16, 32, 64, 128 and so on. Each place is double the one before it, which is why binary is called base 2. Word 1 of: ______ of 2
9ENCODING — ______ turns text, images and sound into whole numbers (character codes, RGB pixel values, sound samples), then stores each number as binary 0s and 1s.
Down
1TYPE — Name the data ______, say which numbers represent it, then show how they become ______. Give a short example for each, e.g. A is 65 because of ASCII, and 65 is 01000001. Word 1 of: ____ -> numbers -> ______
2BASE — ______ is ______-10 and uses ten digits, 0 to 9. Binary is ______-2 and uses only 0 and 1. People use ______ every day, but computers use binary. Word 2 of: _______ ____-10, ______ ____-2
3NUMBER — Find the smallest ______ of bits n whose largest value, 2^n - 1, is at least your ______. Example: 20 is too big for 4 bits (max 15), so it needs 5 bits (max 31). Word 4 of: 2^n - 1 >= ______
5STATE — A ______ with only two possible conditions, like a light switch being off or on. We write the two states as 0 and 1, which is the idea behind binary. Word 2 of: two-_____ ______
8SYSTEM — Word 3 of the term in 5 Down: two-_____ ______