Basic Knowledge Ladder
A 20-question rising-difficulty reveal-answer quiz covering high-leverage fundamentals across general knowledge and critical thinking.
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Quiz Questions & Answers
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Question 1: Which gas do humans breathe in to live?
Oxygen
Question 2: What is the basic unit of life?
Cell
Question 3: What device do you use to call someone remotely over a phone network?
Telephone
Question 4: Which currency is used in Japan?
Yen
Question 5: Which organ pumps blood through the body?
Heart
Question 6: What process turns liquid water into vapor?
Evaporation
Question 7: Which simple machine is a sloped surface used to lift loads more easily?
Inclined plane
Question 8: What term means ‘study of societies and human behavior’?
Sociology
Question 9: Which short list helps prioritize tasks by importance and urgency?
Prioritized to-do list
Question 10: Which cognitive bias makes you favor information that confirms what you already believe?
Confirmation bias
Question 11: What’s the most effective single habit for long-term learning retention?
Spaced practice
Question 12: Which framework helps break projects into small, testable parts and iterate quickly?
Build-measure-learn
Question 13: Which economic concept describes rising prices across an economy?
Inflation
Question 14: Which logical fallacy attacks the person instead of addressing their argument?
Ad hominem
Question 15: Which metric indicates how well a system converts input into desired output (effectiveness)?
Efficiency
Question 16: Which scientific mindset emphasizes testing falsifiable predictions rather than proving ideas?
Falsifiability
Question 17: Which risk-management principle suggests preparing for the worst while hoping for the best?
Precautionary principle
Question 18: Which approach breaks a complex problem into smaller, independently testable hypotheses?
Hypothesis-driven approach
Question 19: Which mental model asks you to invert the problem and consider the opposite solution?
Inversion
Question 20: Which decision rule balances expected impact and probability to prioritize actions under uncertainty?
Expected value