Play exciting free quizzes

Question 1 of 314

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30

🤲 Which organ is responsible for exchanging oxygen and carbon dioxide?

A Heart B Lungs C Liver D Kidneys

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Question 2 of 314

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30

🧬 Which blood cells help the body fight infections?

A Red Blood Cells B White Blood Cells C Platelets D Plasma

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Question 3 of 314

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👃 After vigorous exercise, why does your breathing rate increase?

A To cool the brain B To deliver more oxygen and remove more carbon dioxide C To increase body temperature D To reduce heart rate

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Question 4 of 314

30

💳 In economics, what is inflation?

A A decrease in the general price level B An increase in unemployment C A sustained increase in the general price level of goods and services D A reduction in government spending

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Question 5 of 314

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🌎 Which planet is often called Earth's "twin" because of its similar size?

A Mars B Venus C Mercury D Neptune

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Question 6 of 314

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💦 Why does ice float on water?

A It is colder B It contains air C It is less dense than liquid water D It has more oxygen

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Question 7 of 314

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🌍 What is the hard outer layer of Earth called?

A Mantle B Crust C Core D Lithosphere

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Question 8 of 314

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🌎 Which country is known as the "Land of a Thousand Lakes"?

A Sweden B Finland C Norway D Canada

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