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Worksheets2.2 Methods of Error Detection Cambridge IGCSE 0478
Total questions: 11
Worksheet time: 6mins
Why is error checking necessary after data transmission?
To detect and correct errors that occur during transmission
To reduce the size of transmitted data
To speed up data transmission
To convert data into binary before sending
Which of the following error detection methods adds a parity bit to data?
Parity Check
Checksum
Echo Check
ARQ
What is the purpose of a parity bit in error detection?
To ensure that the total number of 1’s is even or odd
To increase the speed of data transmission
To encode data into hexadecimal format
To replace corrupted data with random values
How does a checksum verify data integrity?
The sender and receiver both calculate a checksum value to compare results
The receiver sends the data back to the sender for confirmation
The checksum converts data into a compressed format
A special bit is added to every byte of data
In an echo check, how is data verified?
The receiver sends the data back to the sender for comparison
The data is checked using an even parity system
The number of characters in the data is counted
A random number is appended to the data
Where is a check digit commonly used?
ISBN numbers and barcodes
Email addresses and passwords
Website URLs
Computer file names
What happens in an Automatic Repeat Query (ARQ) when an error is detected?
The receiver requests the sender to resend the data
The receiver ignores the error and continues transmission
The sender automatically deletes the corrupted data
The receiver replaces the incorrect data with zeros
Which component of ARQ ensures that the sender retransmits data if no response is received?
Timeout
Parity Check
Echo Check
Checksum
What is the purpose of positive and negative acknowledgments in ARQ?
To inform the sender whether the data was received correctly or not
To encrypt data before transmission
To detect and fix transmission errors automatically
To count the total number of bytes sent
Which of the following is an example of a situation where ARQ would be used?
Ensuring error-free data transmission over a network
Compressing large files for storage
Encoding an image file in hexadecimal format
What is one benefit of converting text to binary?
Slower processing
Faster processing
Increased storage space
Easier human readability
