How to Write Multiple-Choice Questions That Can't Be Guessed by Elimination

Every teacher has seen the student who studied nothing and still scores 60% on the multiple-choice section. It's not luck: the test can be read. The longest option is usually right, options with "always" or "never" are usually wrong, and "all of the above" wins more often than it should. Students who've taken years of multiple-choice tests learn to read those cues better than the material.

A good multiple-choice test measures what students know, not how well they read the teacher. This guide covers the rules that make the biggest difference, with examples of badly written questions and their fixed versions. It works the same for a college midterm as for a certification practice exam.

The parts of a multiple-choice question

To be precise:

• Stem: the question or problem.
• Key: the correct option.
• Distractors: the incorrect options.

Almost every flaw in a multiple-choice test is in the distractors. The key is easy to write; three believable wrong answers are not.

Rules for the stem

1. It should be answerable without seeing the options

If you cover the options and the stem doesn't pose a clear question, it's flawed. "The U.S. Constitution…" isn't a question; "In what year was the U.S. Constitution signed?" is.

2. One idea per question

If the stem mixes two concepts, you won't know which one the student got wrong.

3. Avoid negatives (and never use double negatives)

Bad: Which of the following is not a reason that would not justify dismissal?

Better: Which of the following is a valid reason for dismissal?

If you need a negative ("which is not…?"), put it in bold or capitals. A student who misses a "not" hasn't shown they don't know the material.

4. Move repeated words into the stem

Bad:

• a) The deadline to file an appeal is one month.
• b) The deadline to file an appeal is two months.
• c) The deadline to file an appeal is three months.

Better: What is the deadline to file an appeal against a written decision?

• a) One month. b) Two months. c) Three months.

It reads faster and the difference between options is obvious.

Rules for distractors

5. Make them real mistakes, not filler

The best distractor is the mistake your students actually make. If they always confuse two deadlines, two concepts or two authors, that's a distractor. A distractor nobody picks measures nothing; it just turns a four-option question into a three-option one.

Bad: Which organelle carries out photosynthesis?

• a) Chloroplast. b) Mitochondrion. c) The Sun's core. d) A type of rock.

Better: Which organelle carries out photosynthesis?

• a) Chloroplast. b) Mitochondrion. c) Ribosome. d) Vacuole.

6. Same length and same level of detail

The key tends to be the longest, most qualified option, because it's the one the teacher wrote carefully. Students know it.

Bad:

• a) Yes.
• b) No.
• c) Only when the decision is final and no prior reconsideration request has been filed.
• d) It depends.

Better: keep all options a similar length, or rewrite the question so the options are short.

7. Grammatical consistency with the stem

If the stem ends in "an…" and only one option starts with a vowel, the student already knows the answer. Check articles, number and tense across all options.

8. Watch out for absolutes

"Always", "never", "all", "under no circumstances" tend to mark false options, because almost nothing is absolute. If you use them, let them appear in the key sometimes too, or avoid them.

9. Avoid "all of the above" and "none of the above"

• "All of the above" can be answered knowing just two options: if two are true, that's it.
• "None of the above" doesn't tell you whether the student knows the right answer, only which ones are wrong.

If you really need one of these, also use it as a distractor in other questions so it doesn't become a cue.

10. Options that don't overlap

Bad: How many units are in the syllabus?

• a) Fewer than 30. b) Fewer than 50. c) Between 40 and 60. d) More than 55.

If the answer is 25, a and b are both correct. Numeric options should be non-overlapping ranges or exact values.

Rules for the test as a whole

11. Spread the position of the key

Many teachers tend to put the correct answer in b or c. At the end, count: each letter should be correct in a similar proportion.

12. No question should answer another

It's easy for the stem of question 14 to contain the answer to question 3. Check by reading the whole exam in one go.

13. Decide on a guessing penalty and state it

If wrong answers are penalized (for example, a third of a point with four options), guessing stops paying off and the test measures better. Whatever the rule, put it in the instructions. For certification prep, copy the official exam's rule: practicing without a penalty for an exam that has one is practicing something else.

14. Ask about application, not just recall

Multiple choice doesn't have to stop at definitions. A mini-case in the stem ("An employee receives a notice on the 3rd…") turns a recall question into an application question, while keeping fast grading.

A quick review before printing

For each question, in thirty seconds:

1. Can it be answered without seeing the options?
2. Is there an option nobody would choose?
3. Is the key the longest or most qualified option?
4. Is there an "always", "never" or "all of the above"?
5. Do the options fit the stem grammatically?

If a question fails two of these, rewrite it.

Doing it in less time

Writing believable distractors is what takes longest in a multiple-choice test: half an hour for a set of twenty questions is easy. In ExamFlow you upload your material and generate multiple-choice questions on the topics you choose, with the number of questions and the difficulty you want, and you can print the exam blank or download it as a PDF. What comes out is a draft: run this review checklist on it just as you would on your own.

This guide is part of a broader one on how to write an exam, which covers the test blueprint, timing and A/B versions. To see how other teachers use it, read ExamFlow for teachers or try AI exams.