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Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking)
Practice Questions

40 CIE IGCSE Computer Science questions on Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking), each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking)

Question 1 · 1 mark · Difficulty 1/3

What is a parity bit?

  1. An extra bit added to a data unit so that the total count of 1s is odd or even as agreed
  2. The first bit of every byte transmitted
  3. A bit that stores the length of the message
  4. A duplicate copy of the whole data unit
Show answer & explanation
✓ Answer: A — An extra bit added to a data unit so that the total count of 1s is odd or even as agreed
Award 1 mark. The sender and receiver must agree in advance whether odd or even parity is in use.
Question 2 · 1 mark · Difficulty 1/3

What kind of error can a single parity bit detect?

  1. Any number of changed bits
  2. A change in an odd number of bits, including the common case of one bit
  3. Only errors in the parity bit itself
  4. Errors in the order the bytes arrive
Show answer & explanation
✓ Answer: B — A change in an odd number of bits, including the common case of one bit
Award 1 mark. An even number of changes leaves the parity looking correct, so the error passes unnoticed.
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CIE IGCSE Computer Science: Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking) FAQ

Is Kramizo free for CIE IGCSE students preparing for Computer Science?
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Are the Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking) questions aligned to the official CIE IGCSE Computer Science syllabus?
Every question is written against the published CIE IGCSE Computer Science specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking) typically tested on CIE IGCSE Computer Science papers?
Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking) appears across multiple question types on real CIE IGCSE Computer Science papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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