IGCSE Computer Science Paper 1 Crossword: 1.3 Data Storage and Compression (Modules 69–84)
Name:
Date:
Class:
✎
Crossword
Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.
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Across
- 2. Uncompressed sound file size in bits is the ______ rate (Hz) times the ______ resolution (bits) times the length in seconds. Divide the bits by 8 to get bytes. Word 2 of: ____ = ______ rate x resolution x _______ (6)
- 4. Finish a storage calculation by converting the result into the unit the question asks for, then write that unit with your answer, for example 2 MiB. Word 2 of: unit _____ (5)
- 6. After finding an image size in ______, divide by 1024 once for KiB, twice for MiB and three times for GiB, to give the answer in the unit the question asks for. Word 1 of: _____ / 1024 / 1024 (5)
- 7. Word 3 of the term in 3 Down: ______ = width * ______ (6)
- 8. Sound length must be in ______ before using it in a file size calculation, so multiply minutes by 60 (add any extra ______). Length is then the third factor in the formula. Word 1 of: _______ = minutes x 60 (7)
Down
- 1. To convert across several units, divide by 1024 for each ______ up the ladder or multiply by 1024 for each ______ down. Bytes to MiB is two steps, so divide by 1024 twice. Word 2 of: 1024 ___ ____ (3)
- 2. Word 3 of the term in 1 Down: 1024 ___ ____ (4)
- 3. Total ______ = ______ per row times number of rows. For 1920 x 1080 that is 2,073,600 ______. This is the first step when working out image file size. Word 1 of: ______ = width * ______ (6)
- 5. To convert to the next smaller unit (GiB to MiB, MiB to KiB, KiB to bytes), multiply by 1024. The answer should be a bigger number than the one you started with. Word 1 of: ____ * 1024 (4)
- 6. Divide the sound size in ______ by 8 to get bytes, then by 1024 to get KiB. Divide by 1024 again to get MiB. Stop at the unit the question asks for. Word 1 of: ____ / 8 / 1024 (4)
Answer Key
IGCSE Computer Science Paper 1 · Modules 69–84
1P
2S
A
M
3P
L
E
4A
5S
K
E
D
T
I
I
R
6B
Y
T
E
S
X
Z
I
P
E
7H
E
I
G
H
T
L
8S
E
C
O
N
D
S
Across
2SAMPLE — Uncompressed sound file size in bits is the ______ rate (Hz) times the ______ resolution (bits) times the length in seconds. Divide the bits by 8 to get bytes. Word 2 of: ____ = ______ rate x resolution x _______
4ASKED — Finish a storage calculation by converting the result into the unit the question asks for, then write that unit with your answer, for example 2 MiB. Word 2 of: unit _____
6BYTES — After finding an image size in ______, divide by 1024 once for KiB, twice for MiB and three times for GiB, to give the answer in the unit the question asks for. Word 1 of: _____ / 1024 / 1024
7HEIGHT — Word 3 of the term in 3 Down: ______ = width * ______
8SECONDS — Sound length must be in ______ before using it in a file size calculation, so multiply minutes by 60 (add any extra ______). Length is then the third factor in the formula. Word 1 of: _______ = minutes x 60
Down
1PER — To convert across several units, divide by 1024 for each ______ up the ladder or multiply by 1024 for each ______ down. Bytes to MiB is two steps, so divide by 1024 twice. Word 2 of: 1024 ___ ____
2STEP — Word 3 of the term in 1 Down: 1024 ___ ____
3PIXELS — Total ______ = ______ per row times number of rows. For 1920 x 1080 that is 2,073,600 ______. This is the first step when working out image file size. Word 1 of: ______ = width * ______
5SIZE — To convert to the next smaller unit (GiB to MiB, MiB to KiB, KiB to bytes), multiply by 1024. The answer should be a bigger number than the one you started with. Word 1 of: ____ * 1024
6BITS — Divide the sound size in ______ by 8 to get bytes, then by 1024 to get KiB. Divide by 1024 again to get MiB. Stop at the unit the question asks for. Word 1 of: ____ / 8 / 1024