IGCSE Computer Science Paper 1 Crossword: 1.2 Text, Sound and Images and 1.3 Data Storage and Compression (Modules 43–58)
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
Across
- 1. Balancing quality against file size: pick the lowest sample rate, resolution or colour depth that still looks or sounds good enough, so the file stays small enough to store or send. Word 1 of: _____-___ (5)
- 3. Word 2 of the term in 1 Across: _____-___ (3)
- 5. Word 2 of the term in 4 Down: ______ ____ _____ (4)
- 8. Word 1 of the term in 6 Down: ________ to _______ (8)
Down
- 2. The number of bits used to store each sample of a sound. More bits give more possible volume levels and a more accurate recording. 16 bits per sample is common. Word 2 of: sample __________ (10)
- 4. A ______ giving each colour a binary ______. Write each pixel's ______ row by row to encode an image; read the codes back to redraw it. 4 colours need 2 bits. Word 3 of: ______ ____ _____ (5)
- 5. The number of bits used to store the ______ of each pixel. More bits per pixel means more possible colours, such as 1 bit for 2 colours or 24 bits for true ______. Word 1 of: ______ _____ (6)
- 6. A sound wave is ______: its amplitude changes smoothly. A computer stores only separate binary numbers, so the wave a microphone captures must be converted into discrete ______ values. Word 3 of: ________ to _______ (7)
- 7. Word 2 of the term in 5 Down: ______ _____ (5)
- 8. Unicode supports far more characters than 8-bit ______ but uses 16 or 32 bits per character, so the same text takes up more storage space. Word 3 of: Unicode vs _____ (5)
Answer Key
IGCSE Computer Science Paper 1 · Modules 43–58
1T
2R
A
D
E
E
S
3O
F
F
4T
L
A
U
B
T
L
I
5C
O
6D
E
O
O
I
7D
8A
N
A
L
O
G
U
E
S
O
I
P
C
U
T
T
I
R
A
H
I
L
Across
1TRADE — Balancing quality against file size: pick the lowest sample rate, resolution or colour depth that still looks or sounds good enough, so the file stays small enough to store or send. Word 1 of: _____-___
3OFF — Word 2 of the term in 1 Across: _____-___
5CODE — Word 2 of the term in 4 Down: ______ ____ _____
8ANALOGUE — Word 1 of the term in 6 Down: ________ to _______
Down
2RESOLUTION — The number of bits used to store each sample of a sound. More bits give more possible volume levels and a more accurate recording. 16 bits per sample is common. Word 2 of: sample __________
4TABLE — A ______ giving each colour a binary ______. Write each pixel's ______ row by row to encode an image; read the codes back to redraw it. 4 colours need 2 bits. Word 3 of: ______ ____ _____
5COLOUR — The number of bits used to store the ______ of each pixel. More bits per pixel means more possible colours, such as 1 bit for 2 colours or 24 bits for true ______. Word 1 of: ______ _____
6DIGITAL — A sound wave is ______: its amplitude changes smoothly. A computer stores only separate binary numbers, so the wave a microphone captures must be converted into discrete ______ values. Word 3 of: ________ to _______
7DEPTH — Word 2 of the term in 5 Down: ______ _____
8ASCII — Unicode supports far more characters than 8-bit ______ but uses 16 or 32 bits per character, so the same text takes up more storage space. Word 3 of: Unicode vs _____