IMO Practice Test — Earth & Space
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
hard
Planets do not twinkle like stars because they…
Make their own light
Are closer and shine by steady reflected light
Are bigger than stars
Are very hot
Explanation: Nearby planets reflect steady light, so they do not twinkle.
Question 2 of 6
hard
Sailors of old used constellations and the Pole Star mainly to…
Find their direction at sea
Catch fish
Cook food
Make rain
Explanation: Star patterns helped sailors navigate.
Question 3 of 6
hard
The Solar System is just a tiny part of a much larger group of billions of stars called a…
Country
Planet
Moon
Galaxy
Explanation: Our Solar System lies within the Milky Way galaxy.
Question 4 of 6
hard
Our Sun is just an average star but looks far brighter than other stars because it is…
A planet
Bigger than all stars
Hotter than all stars
Much closer to us
Explanation: The Sun looks bright mainly because it is the nearest star.
Question 5 of 6
hard
A robot vehicle that explores a planet surface, like on Mars, is called a…
Rocket
Rover
Satellite
Telescope
Explanation: A rover drives across a planet to explore it.
Question 6 of 6
hard
Why do astronauts wear heavy boots or use straps inside a space station?
To run faster
To keep warm
To look smart
To stop floating away in low gravity
Explanation: Straps and weights help them stay put without gravity.