GCSE - Comms and Networking: Error Detection

Description

Checksum, check digit and parity check practice for GCSE Computer Science
Henry Deane
Quiz by Henry Deane, updated more than 1 year ago
Henry Deane
Created by Henry Deane over 6 years ago
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Resource summary

Question 1

Question
The sequence of numbers 8,3,6,1,9,0,2,4 produces the checksum of [blank_start]33[blank_end]
Answer
  • 33

Question 2

Question
The sequence of numbers 1,6,7,3,9,4,5,2 produces the checksum of [blank_start]37[blank_end]
Answer
  • 37

Question 3

Question
The sequence of numbers 5,0,9,9,7,5,6,8 produces the checksum of [blank_start]49[blank_end]
Answer
  • 49

Question 4

Question
Using modulo 11 the sequence of numbers 8,3,6,1,9,0,2,4 produces the check digit of [blank_start]0[blank_end]
Answer
  • 0

Question 5

Question
Using modulo 11 the sequence of numbers 1,6,7,3,9,4,5,2 produces the check digit [blank_start]4[blank_end]
Answer
  • 4

Question 6

Question
Using modulo 11 the sequence of numbers 5,0,9,9,7,5,6,8 produces the check digit of [blank_start]5[blank_end]
Answer
  • 5

Question 7

Question
Using modulo 11 the sequence of numbers 9,11,2,18,21,5,23,31 produces the check digit [blank_start]X[blank_end]
Answer
  • X

Question 8

Question
In a parity check the least significant bit is used for the parity bit, this is the [blank_start]first[blank_end] bit on the [blank_start]right[blank_end]
Answer
  • first
  • right

Question 9

Question
Using even parity the parity bit is [blank_start]1[blank_end] for the sequence of binary 0 1 0 1 1 0 0
Answer
  • 1

Question 10

Question
Using even parity the parity bit is [blank_start]0[blank_end] for the binary sequence 1 0 0 1 0 1 1
Answer
  • 0

Question 11

Question
Using even parity which of the following three 8 bit binary numbers has been transmitted incorrectly?
Answer
  • 0 1 0 1 1 0 0 1
  • 0 0 1 0 1 1 0 1
  • 1 0 0 1 0 0 0 1

Question 12

Question
Using negative parity which of the following three numbers has been incorrectly transmitted?
Answer
  • 0 1 0 1 1 0 0 1
  • 1 0 0 1 0 0 0 1
  • 0 1 0 0 1 1 1 1

Question 13

Question
Using positional numbers that are even and modulo 11 the check digit for the following sequence of numbers is [blank_start]X[blank_end] positions in even numbers: 2 4 6 8 10 12 14 16 sequence of numbers: 5 0 9 9 7 5 6 9
Answer
  • X
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