A multiple-choice question lives or dies by its wrong answers. The stem and the key are the easy part; the distractors are where an MCQ either does real diagnostic work or just asks students to recognise the one option that sounds like the textbook. Good distractors are not filler — each one should correspond to a specific way of being wrong.
Distractors that map to misconceptions
Write each wrong option to catch a particular error: a common algebra slip, a confused definition, a half-remembered rule. When a class clusters on one distractor, you have found a misconception worth re-teaching — the question taught you something too.
- Every distractor should be plausible to a student who holds a specific wrong idea.
- Avoid ‘all of the above’ and joke options — they shrink the real choice to a coin flip.
- Keep options parallel in length and grammar, so form gives nothing away.
The discrimination test
A good MCQ is one the strong students get right more often than the weak ones — that gap is its discrimination. A question everyone gets right, or everyone misses, tells you nothing. Distractors are the lever that opens up that gap.
A wrong answer nobody picks is wasted ink. Make every distractor a hypothesis about how a student went wrong.
Sana Hameed
Sana has spent over a decade setting mathematics and science papers across Pakistani boards. She writes about syllabus changes and keeping term tests aligned with them.
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