Spot the hidden assumption
Every argument hides something it assumes is true - can you spot it? In this Brain Teasers quiz, you’ll read short claims and pick the unstated premise that makes them “work.” Choose your preferred qu...
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About this quiz
What you’ll do in this quiz
Hidden assumptions are the quiet “of course” statements that an argument depends on, even when they’re never said out loud. This quiz trains you to notice what must be true for a conclusion to follow.
Each question is multiple-choice with 4 options and no timer, so you can slow down and test each option against the claim. You can also choose your question count and difficulty before you start, making it easy to do a quick warm-up or a longer mixed session.
Skills you’ll practice
You’ll get better at separating evidence from conclusions and spotting gaps that are covered by an unstated premise. Over time, you’ll recognize common reasoning patterns - like causal leaps, overgeneralizations, and “either/or” framing.
Common pitfalls to avoid
Many wrong answers sound reasonable but aren’t required by the argument. Watch out for options that add new facts, strengthen the conclusion more than necessary, or introduce a different topic than the original claim.
How the difficulty stays balanced
Because the difficulty is Mixed, you’ll see a blend of straightforward assumptions and more subtle ones that rely on careful wording. Easier items focus on one clear missing link, while harder ones include tempting distractors that are plausible but not essential.
- Identify the conclusion first, then ask: “What must be true for this to hold?”
- Prefer the option that is necessary, not merely helpful or likely
- Be cautious with extreme words (always, never) unless the argument demands them
- Don’t pick background facts that aren’t required for the reasoning to work
- If two options seem close, test which one the argument collapses without
Sample questions
If someone says, 'All dogs are friendly,' what assumption are they making?
- A.All dogs have the capacity to be friendly.
- B.All dogs are the same breed.
- C.All dogs like cats.
- D.All dogs are well-trained.
When someone argues, 'You shouldn't eat sweets because they are bad for you,' what underlying assumption do they hold?
- A.Sweets have negative health effects.
- B.Sweets are expensive.
- C.Sweets are only for children.
- D.Sweets are hard to digest.
If a teacher claims, 'Students who study hard get good grades,' what assumption is being made?
- A.Studying hard leads to good grades.
- B.All students study the same way.
- C.Good grades are the only measure of success.
- D.Only students who study hard can succeed.
Quiz FAQ
How many questions are in this quiz?
This quiz has 155 questions focused on spotting hidden assumptions in short arguments.
What format are the questions in?
Each question has 4 options and there is no timer, so you can think through the logic carefully.
Can I choose the number of questions and difficulty?
Yes. You can set your preferred question count and select a difficulty level before starting.
What counts as a hidden assumption here?
It’s an unstated premise that must be true for the argument’s conclusion to follow from its stated reasons.
Why do I keep picking answers that feel right but are wrong?
A common trap is choosing an option that strengthens the argument but isn’t required. The correct assumption is necessary, not just persuasive.
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