IGCSE Computer Science Paper 1 Word Scramble: 2.1 Data Transmission Types and Methods and 2.2 Methods of Error Detection (Modules 142–154)
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Word scramble
Unscramble the letters and write each key term on the line.
1
SUB BASARWDCK
Limits of USB: short maximum cable length (unreliable over distance), slower speed than some interfaces (old ports slow new devices), and a limited number of ports.
2
ULTAEEVA SBU
Judge if USB suits a use by weighing benefits (universal, plug and play) against drawbacks (short cable length, limited speed) for the scenario, such as a printer or drive.
3
RROER TEECDITON
Checking received data, because it can be damaged in transit and the receiver cannot see the original. Spotting the error is the first step to fixing it.
4
ERTCIFNERNEE
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.
5
ATAD SSLO
When some bits or bytes that were sent never arrive, so the message that is received is shorter than the one that was sent.
6
ATDA AGNI
______ is when extra bits or bytes that were not sent are added to the data, so the message arrives longer than it was sent. It is a type of transmission error.
7
TAAD ACNEGH
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.
8
TIPYAR TBI
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.
Answer Key
IGCSE Computer Science Paper 1 · Modules 142–154
1SUB BASARWDCK → USB drawbacks — Limits of USB: short maximum cable length (unreliable over distance), slower speed than some interfaces (old ports slow new devices), and a limited number of ports.
2ULTAEEVA SBU → Evaluate USB — Judge if USB suits a use by weighing benefits (universal, plug and play) against drawbacks (short cable length, limited speed) for the scenario, such as a printer or drive.
3RROER TEECDITON → error detection — Checking received data, because it can be damaged in transit and the receiver cannot see the original. Spotting the error is the first step to fixing it.
4ERTCIFNERNEE → interference — 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.
5ATAD SSLO → data loss — When some bits or bytes that were sent never arrive, so the message that is received is shorter than the one that was sent.
6ATDA AGNI → data gain — Data gain is when extra bits or bytes that were not sent are added to the data, so the message arrives longer than it was sent. It is a type of transmission error.
7TAAD ACNEGH → data change — 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.
8TIPYAR TBI → parity bit — 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.