math/logic
history/ess
biology
physics
chemistry
1

This number is approximated as 3.14, and is the ratio of the circumference of a circle to its diameter in Euclidean geometry.

What is Pi?

1

This country declared "war" on emus.

What is Australia?

1

This animal often lives in modern houses.

What are humans?

1

This can theoretically travel at the speed of light.

What is light?

2

If a statement is true, this other statement must also be true.

What is the contrapositive?

3

Most people cut this object for hygiene or cultural purposes.

What is hair?

3

This molecule with acidic properties has the highest pH.

What is water?

4

This mixture covers >75% of the Earth's surface.

What is air?

4

These two products are formed in the reaction of sodium hydroxide and hydrochloric acid.

What are salt and water?
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