IGCSE Computer Science Paper 1 Crossword: 2.1 Data Transmission Types and Methods and 2.2 Methods of Error Detection (Modules 142–154)
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
- 3. Word 2 of the term in 2 Down: ___ _________ (9)
- 5. Word 4 of the term in 4 Down: _______ ____ and ________ (8)
- 6. Unwanted disturbance to a signal, such as electrical noise or crosstalk, that damages data as it travels and can cause bits to be lost, gained or changed. (12)
- 8. Word 1 of the term in 4 Down: _______ ____ and ________ (7)
- 9. One extra bit added to a group of bits (such as 7 data bits) so the total number of 1s follows a rule, even or odd, agreed by sender and receiver. It is used to detect errors. Word 1 of: ______ bit (6)
Down
- 1. Bits arrive altered, such as a 0 flipping to a 1, so the same amount of data arrives but with wrong values. Comparing sent and received bits shows it. Word 2 of: data ______ (6)
- 2. Limits of ______: short maximum cable length (unreliable over distance), slower speed than some interfaces (old ports slow new devices), and a limited number of ports. Word 1 of: ___ _________ (3)
- 3. Checking received data, because it can be damaged in transit and the receiver cannot see the original. Spotting the ______ is the first step to fixing it. Word 2 of: _____ _________ (9)
- 4. ______ the data ______ with the data ______. Fewer bits or characters means loss, extra ones means gain, and the same length with different values means change. Word 2 of: _______ ____ and ________ (4)
- 7. Word 1 of the term in 3 Down: _____ _________ (5)
Answer Key
IGCSE Computer Science Paper 1 · Modules 142–154
1C
2U
H
S
3D
R
A
W
B
A
C
K
4S
E
N
E
T
G
N
5R
E
C
E
I
V
E
D
T
C
6I
N
T
E
R
F
7E
R
E
N
C
E
I
R
8C
O
M
P
A
R
E
N
O
9P
A
R
I
T
Y
Across
3DRAWBACKS — Word 2 of the term in 2 Down: ___ _________
5RECEIVED — Word 4 of the term in 4 Down: _______ ____ and ________
6INTERFERENCE — Unwanted disturbance to a signal, such as electrical noise or crosstalk, that damages data as it travels and can cause bits to be lost, gained or changed.
8COMPARE — Word 1 of the term in 4 Down: _______ ____ and ________
9PARITY — One extra bit added to a group of bits (such as 7 data bits) so the total number of 1s follows a rule, even or odd, agreed by sender and receiver. It is used to detect errors. Word 1 of: ______ bit
Down
1CHANGE — Bits arrive altered, such as a 0 flipping to a 1, so the same amount of data arrives but with wrong values. Comparing sent and received bits shows it. Word 2 of: data ______
2USB — Limits of ______: short maximum cable length (unreliable over distance), slower speed than some interfaces (old ports slow new devices), and a limited number of ports. Word 1 of: ___ _________
3DETECTION — Checking received data, because it can be damaged in transit and the receiver cannot see the original. Spotting the ______ is the first step to fixing it. Word 2 of: _____ _________
4SENT — ______ the data ______ with the data ______. Fewer bits or characters means loss, extra ones means gain, and the same length with different values means change. Word 2 of: _______ ____ and ________
7ERROR — Word 1 of the term in 3 Down: _____ _________