Henry Deane
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Checksum, check digit and parity check practice for GCSE Computer Science

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Henry Deane
Created by Henry Deane over 6 years ago
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GCSE - Comms and Networking: Error Detection

Question 1 of 13

1

Fill the blank space to complete the text.

The sequence of numbers 8,3,6,1,9,0,2,4 produces the checksum of

Explanation

Question 2 of 13

1

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The sequence of numbers 1,6,7,3,9,4,5,2 produces the checksum of

Explanation

Question 3 of 13

1

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The sequence of numbers 5,0,9,9,7,5,6,8 produces the checksum of

Explanation

Question 4 of 13

1

Fill the blank space to complete the text.

Using modulo 11 the sequence of numbers 8,3,6,1,9,0,2,4 produces the check digit of

Explanation

Question 5 of 13

1

Fill the blank space to complete the text.

Using modulo 11 the sequence of numbers 1,6,7,3,9,4,5,2 produces the check digit

Explanation

Question 6 of 13

1

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Using modulo 11 the sequence of numbers 5,0,9,9,7,5,6,8 produces the check digit of

Explanation

Question 7 of 13

1

Fill the blank space to complete the text.

Using modulo 11 the sequence of numbers 9,11,2,18,21,5,23,31 produces the check digit

Explanation

Question 8 of 13

1

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In a parity check the least significant bit is used for the parity bit, this is the bit on the

Explanation

Question 9 of 13

1

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Using even parity the parity bit is for the sequence of binary 0 1 0 1 1 0 0

Explanation

Question 10 of 13

1

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Using even parity the parity bit is for the binary sequence 1 0 0 1 0 1 1

Explanation

Question 11 of 13

1

Using even parity which of the following three 8 bit binary numbers has been transmitted incorrectly?

Select one of the following:

  • 0 1 0 1 1 0 0 1

  • 0 0 1 0 1 1 0 1

  • 1 0 0 1 0 0 0 1

Explanation

Question 12 of 13

1

Using negative parity which of the following three numbers has been incorrectly transmitted?

Select one of the following:

  • 0 1 0 1 1 0 0 1

  • 1 0 0 1 0 0 0 1

  • 0 1 0 0 1 1 1 1

Explanation

Question 13 of 13

1

Fill the blank space to complete the text.

Using positional numbers that are even and modulo 11 the check digit for the following sequence of numbers is

positions in even numbers: 2 4 6 8 10 12 14 16
sequence of numbers: 5 0 9 9 7 5 6 9

Explanation

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