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

20 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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Question 1 · 1 mark · Difficulty 1/3

In majority voting, a single bit is transmitted three times. The receiver receives 1, 0, 1. What value does the receiver conclude was sent?

  1. 0, because the middle bit determines the result
  2. 1, because two out of three bits are 1
  3. 0, because two out of three bits are 0
  4. Cannot be determined without a parity bit
Show answer & explanation
✓ Answer: B — 1, because two out of three bits are 1
In majority voting, the receiver takes the value that appears most frequently across all copies; here 1 appears twice and 0 appears once, so the conclusion is that 1 was the intended bit. Option A is incorrect because no single positional bit determines the result. Option B is wrong because majority voting does not require parity bits. Option C misidentifies the majority value.
Question 2 · 1 mark · Difficulty 1/3

Which statement best describes the purpose of echo checking during data transmission?

  1. The receiver counts parity bits and echoes only the error flag to the sender
  2. The sender retransmits the data twice so the receiver can compare both copies
  3. The receiver adds a checksum and returns it to verify the data was not corrupted
  4. The receiver sends the data back to the sender, who compares it with the original
Show answer & explanation
✓ Answer: D — The receiver sends the data back to the sender, who compares it with the original
In echo checking, the receiver returns the received data to the original sender, who then compares it with the data that was sent; any mismatch indicates a transmission error. Option A describes a checksum process, not echo checking. Option C describes majority voting rather than echo checking. Option D conflates parity checking with echo checking.
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CIE IGCSE Computer Science: Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking) FAQ

How many CIE IGCSE Computer Science questions on Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking) are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking) for CIE IGCSE Computer Science, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Computer Science?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Data transmission: methods of error detection (parity bits, majority voting, checksums, echo checking) practice with other Computer Science topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
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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