How to Write Good Distractor Answers for MCQs
What makes a good wrong answer in a multiple-choice question, and how to sharpen auto-generated distractors.
Direct answer
Good distractors are plausible, similar in length and style to the correct answer, and based on common misconceptions — not obviously wrong or joke options. Avoid 'all of the above', keep options mutually exclusive, and make sure only one is truly correct. The generator drafts distractors; edit weak ones.
Open the Quiz GeneratorWhen to use this
- Your quiz options are too easy or obviously wrong.
- You are writing an assessment and want fair, discriminating questions.
- You want to improve auto-generated distractors.
Steps
- Generate the quiz to get a first draft of options.
- Replace any joke or obviously wrong option with a plausible one.
- Base distractors on common mistakes learners actually make.
- Match the length and grammar of the correct answer so it does not stand out.
- Confirm exactly one option is correct and options do not overlap.
Example
Weak options: Q. What does the CPU do? A) Runs instructions ✓ B) A banana C) Nothing D) The moon
Improved options: Q. What does the CPU do? A) Executes program instructions ✓ B) Stores files long-term (that is the disk) C) Displays images (that is the GPU) D) Supplies power (that is the PSU) Explanation: Distractors are real components learners confuse with the CPU.
Common mistakes
- Avoid 'all of the above' and 'none of the above'; they test test-taking, not knowledge.
- Do not let the correct answer be the longest or most detailed option — it becomes a giveaway.
- Make sure distractors are actually wrong; a second defensible answer breaks the question.
FAQ
- What makes a good distractor in a multiple-choice question?
- A plausible wrong answer based on a common misconception, similar in length and style to the correct answer, with only one option truly correct.
- How do I improve auto-generated wrong answers?
- Swap obvious or joke options for real concepts learners confuse with the answer, match their phrasing to the correct option, and keep exactly one correct choice.
- Should I use 'all of the above'?
- Avoid it. It tends to test exam technique rather than understanding and often makes the question easier to guess.
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