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Solar System Practice Questions  Back to Science Questions Click here for the Answers to Solar System questions 1. Q: How many planets are there in the Solar System? A: 7 B: 8 C: 9 D: 10 ------------------------------------- 2. Q: What planet is closest to the sun? A: Mars B: Mercury C: Earth D: Venus ------------------------------------- 3. Q: What is the second planet from the sun? A: Mercury B: Earth C: Mars D: Venus ------------------------------------- 4. Q: What is the third planet from the sun? A: Earth B: Mars C: Jupiter D: Venus ------------------------------------- 5. Q: What is the fourth planet from the sun? A: Earth B: Mars C: Venus D: Jupiter ------------------------------------- 6. Q: What is the fifth planet from the sun? A: Saturn B: Mars C: Uranus D: Jupiter ------------------------------------- 7. Q: What is the seventh planet from the sun? A: Jupiter B: Uranus C: Neptune D: Pluto ------------------------------------- 8. Q: What is the sixth planet from the sun? A: Saturn B: Mars C: Jupiter D: Pluto ------------------------------------- 9. Q: What is the eighth planet from the sun? A: Jupiter B: Pluto C: Uranus D: Neptune ------------------------------------- 10. Q: What is the farthest planet from the sun? A: Pluto B: Mars C: Venus D: Jupiter ------------------------------------- 11. Q: Which planet is not a gas giant? A: Neptune B: Saturn C: Mars D: Jupiter ------------------------------------- 12. Q: Which planet is not a terrestrial planet? A: Saturn B: Earth C: Mars D: Venus ------------------------------------- 13. Q: What is the most volcanically active body in the solar system? A: Mars B: Io C: Ganymede D: Pluto ------------------------------------- 14. Q: Which planet has the largest ring system? A: Jupiter B: Pluto C: Mercury D: Saturn ------------------------------------- 15. Q: How much meteoritic material do scientists estamate falls on the Earth each day? A: 1 pound B: 1 ton C: 10 tons D: more than 1000 tons ------------------------------------- 16. Q: Which is the densest planet? A: Mars B: Earth C: Jupiter D: Pluto ------------------------------------- 17. Q: What is the largest terrestrial planet? A: Mars B: Mercury C: Venus D: Earth ------------------------------------- 18. Q: What is the only known moon of Pluto? A: Plutonia B: Charon C: Io D: Ganymede ------------------------------------- 19. Q: What is the Earth's radius? A: 6378 Km B: 1237 Km C: 12400 Km D: 25000 Km ------------------------------------- 20. Q: What is the rotational period of Earth? A: 1 year B: 48 hours C: 24 hours D: 12 hours ------------------------------------- 21. Q: Where is the main asteroid belt in the Solar System? A: Just outside Pluto's orbit B: Between Earth and Mars C: Between Neptune and Saturn D: Between Mars and Jupiter ------------------------------------- 22. Q: What asteroid was the focus of the NEAR spacecraft? A: Eros B: Io C: Gaspra D: Ida ------------------------------------- 23. Q: Where do most comets arrive from? A: the asteroid belt B: the Oort cloud C: the Milky Way D: Saturns rings ------------------------------------- 24. Q: How long could a long-period comet take to orbit around the Sun? A: 1000 years B: 10000 years C: 100000 years D: 30 million years ------------------------------------- 25. Q: What is the comet belt outside of Pluto's orbit called? A: the Oort cloud B: Kuiper Belt C: Main asteroid Belt D: Halley Belt ------------------------------------- 26. Q: Which is shorter, Mercury's day or year? A: day B: year ------------------------------------- 27. Q: Which planet has the hottest temperatures? A: Mercury B: Mars C: Venus D: Pluto ------------------------------------- 28. Q: How long is Mercury's day? A: 5 minutes B: 10 Earth days C: 176 Earth days D: 3 Earth years ------------------------------------- 29. Q: Which moon is a moon of Mars? A: Phobos B: Io C: Ganymede D: Charon ------------------------------------- 30. Q: Which planet is Olympus Mons, the highest volcano in the Solar System, on? A: Jupiter B: Mars C: Venus D: Mercury ------------------------------------- 31. Q: What is the largest planet in the Solar System? A: Mars B: Saturn C: Neptune D: Jupiter ------------------------------------- 32. Q: How large is jupiter's mass when compared to the other planets in the Solar System? A: twice as big as all the other planets combined B: as big as all the other planets combined C: three times as big as all the other planets combined D: four times as big as all the other planets combined ------------------------------------- 33. Q: What is the Great Red Spot and Jupiter? A: A volcanic reaction that has lasted over 100 years B: A storm that has lasted over 100 years C: A storm that has lasted almost 10 years D: A giant red lake ------------------------------------- 34. Q: How many moons does Jupiter have? A: 12 B: 14 C: 16 D: 18 ------------------------------------- 35. Q: Which planet has the most moons? A: Jupiter B: Mercury C: Mars D: Uranus ------------------------------------- 36. Q: Which planet was the first planet located through mathematical predictions rather than through regular observations of the sky? A: Neptune B: Pluto C: Uranus D: Mercury ------------------------------------- 37. Q: Which planet has the fastest winds, blowing at speeds of over 2,400 km (1500 miles) per hour? A: Uranus B: Neptune C: Pluto D: Saturn ------------------------------------- 38. Q: What is the smallest planet? A: Mercury B: Earth C: Pluto D: Venus ------------------------------------- 39. Q: How many years does it take Pluto to orbit around the sun? A: 3 B: 15 C: 97 D: 248 ------------------------------------- 40. Q: Which is the coldest planet of the Solar System? A: Pluto B: Earth C: Mars D: Neptune -------------------------------------     Click here for the Answers to Solar System questions Back to Science Questions

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