Common Knowledge Trap — 15 “Obvious” Questions in 120 Seconds

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Common Knowledge Trap

Looks easy—until it isn’t. Bust popular myths and half-remembered “facts” with precise, well-worded questions and instant grading.

1 / 15

What color do you get when you mix red and blue light (additive)?

2 / 15

What is the pH of pure water at 25°C?

3 / 15

How many degrees are in a triangle's angles combined?

4 / 15

Which chess piece can move in an L-shape?

5 / 15

How many bones does an adult human have?

6 / 15

Which blood cells help your body fight infection?

7 / 15

Which country is both in Europe and Asia?

8 / 15

Which continent contains the most countries?

9 / 15

What is the capital of Switzerland?

10 / 15

What is the next prime number after 13?

11 / 15

Which sentence uses 'their' correctly?

12 / 15

Tomatoes are botanically classified as what?

13 / 15

Where were the first modern Olympic Games held (1896)?

14 / 15

What is the chemical symbol for sodium?

15 / 15

Where would you find the city of Reykjavik?

“Common Knowledge Trap” looks friendly at first glance and then quietly checks your assumptions. You’ll face 15 cleanly written questions that target half-remembered facts, popular myths, and details people mix up. You have 120 seconds to get at least 8 right.

Each item gives four choices—one correct, three plausible. The interface stays out of your way so you can focus on the wording. Answers grade instantly, and your score updates as you go. After the round, scan your misses and try again; repetition here builds sharp instincts fast.

A few habits help: beware absolutes like “always” and “only,” check units and time frames, and prefer precise facts over common sayings. If two answers seem reasonable, eliminate the broader one and choose the one with the tighter definition. Think you won’t fall for the easy stuff? Press Start and prove it.

Note: This quiz has been fact-checked and reviewed by our Quiz Editorial Team to balance reliability with fun.