Cognitive Bias Quiz: Which Mental Traps Fool You?

12 everyday moments. Which mental trap is fooling you? Plain-English explanations after each one — no sign-up.

0 / 12 answered

You've decided a coworker is lazy, so you only notice when they slack off and ignore when they work hard.

A jacket is "$300, now $99!" and it instantly feels cheap — even if it's only worth $40.

"My uncle dropped out and got rich, so college is pointless."

The movie's boring 40 minutes in, but you stay "because I already paid and sat through this much."

After seeing plane-crash news you're scared to fly, but happily drive (far riskier).

After one YouTube video you feel you basically understand quantum physics.

After your team loses, you say "I knew they'd lose all along."

A well-dressed, attractive candidate seems smarter and more competent — before they've said a word.

A restaurant has a long line, so you assume it must be the best and join.

Q10

Losing $100 feels much worse than the joy of finding $100.

Q11

You ace the test → "I'm smart." You fail → "the test was unfair."

Q12

You get 9 compliments and 1 criticism — and obsess over the 1.

Answer all 12 questions to see your result 👆

The 12 biases in this quiz (cheat sheet)

Confirmation Bias: Noticing only what confirms what you already believe.
Anchoring: Letting the first number set your whole judgment.
Survivorship Bias: Hearing only the winners, missing the silent failures.
Sunk Cost Fallacy: Continuing because of what you've already spent.
Availability Heuristic: Treating easy-to-recall events as more likely.
Dunning-Kruger: Knowing a little, feeling like an expert.
Hindsight Bias: "I knew it all along" — after the fact.
Halo Effect: One good trait spilling onto unrelated ones.
Bandwagon: Assuming popular = good or true.
Loss Aversion: Losses hurting more than equal gains please.
Self-Serving Bias: Wins = my skill; losses = bad luck.
Negativity Bias: Bad sticking harder in memory than good.

What is a cognitive bias?

A cognitive bias is a mental shortcut that systematically skews your judgment — usually without you noticing. They're not stupidity; they're how every human brain saves energy. The cost is predictable mistakes in money, relationships, and decisions.

You can't delete biases, but you can learn to catch them in the act. Naming them is the first step — start with the 12 that cause most everyday mistakes.

FAQ

What is a cognitive bias?

A mental shortcut that systematically skews your judgment without you noticing.

Cognitive bias vs logical fallacy?

A bias is a flaw in how you think; a fallacy is a flaw in how an argument is built.

Is this quiz free?

Yes — 12 questions, instant results, no sign-up.

How many cognitive biases are there?

180+ are documented, but ~12–15 cause most everyday mistakes — the ones here.

Can you get rid of cognitive biases?

Not fully, but naming and practicing spotting them sharply reduces their grip.