IMO Practice Test — Earth, Sun & Moon
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
hard
The Moon changes shape over a month because we see different amounts of its…
Colour
Own light
Sunlit side
Size
Explanation: Phases come from how much of the Sunlit Moon we can see.
Question 2 of 6
hard
The planet closest to the Sun and very hot is…
Mercury
Neptune
Earth
Saturn
Explanation: Mercury is nearest the Sun and very hot.
Question 3 of 6
hard
Almost all energy on Earth, even in our food, first came from the…
Wind
Moon
Rocks
Sun
Explanation: The Sun is the source of nearly all our energy.
Question 4 of 6
hard
If the Earth stopped spinning, one side would have…
Endless day, the other endless night
Two suns
No gravity
More moons
Explanation: Without spin, one side stays in day, the other in night.
Question 5 of 6
hard
Why can't we live on a planet with no water or air, like the Moon?
Living things need water and air to survive
It is too bright
It is too small
It has no rocks
Explanation: Life needs water and air, which the Moon lacks.
Question 6 of 6
medium
Ships sailing away slowly disappear bottom-first over the horizon. This hints that the Earth is…
Square
Flat
Curved (round)
Hollow
Explanation: Disappearing bottom-first shows Earth's curved surface.