This quiz works best with JavaScript enabled. Home > Science > Physics > Solar System – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Solar System Quiz 21 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Objects in space made up of hot gases, like the sun, are called ..... A) Planets. B) Moons. C) Rocks. D) Stars. Show Answer Correct Answer: D) Stars. 2. Which is considered the SMALLEST planet? A) Uranus. B) Mercury. C) Saturn. D) None of above. Show Answer Correct Answer: B) Mercury. 3. D largest planet in the solar system, has the largest ring system of any outer planet-rings are made of tiny bits of ice, rock, and dust A) Jupiter. B) Saturn. C) Uranus. D) Neptune. Show Answer Correct Answer: B) Saturn. 4. What is the length of Earth's period of revolution? A) 24 hours. B) 30-31 days. C) 365.25 days. D) 6 months. Show Answer Correct Answer: C) 365.25 days. 5. Which of the following would best describe Galileo? A) Arrested because of his ideas about the solar system. B) Wanted to be a doctor. C) Arrested for looking for a new planet. D) Built the Hubble telescope. Show Answer Correct Answer: A) Arrested because of his ideas about the solar system. 6. Which object has the strongest gravitational pull in our solar system and is found at the center of the solar system? A) The Sun. B) The Earth. C) The Moon. D) Pluto. Show Answer Correct Answer: A) The Sun. 7. Sam, a Scientist, think the ..... became instinct when one of the comets came crushing into planet Earth. A) Giraffes. B) White shark. C) Dinosaurs. D) None of above. Show Answer Correct Answer: C) Dinosaurs. 8. Which list of planets shows the inner planets in correct order from the Sun? A) Mars, Venus, Earth, Mercury. B) Venus, Mercury, Mars, Earth. C) Earth, Mars, Venus, Mercury. D) Mercury, Venus, Earth, Mars. Show Answer Correct Answer: D) Mercury, Venus, Earth, Mars. 9. What does Ly stand for? A) Lasso the young horse. B) Lightning McQueen. C) Light years. D) Kilometers. Show Answer Correct Answer: C) Light years. 10. What happens when Earth rotates? A) The shape of the sun changes. B) The length of a shadow changes. C) The number of hours in a day changes. D) The moon falls out of the sky. Show Answer Correct Answer: B) The length of a shadow changes. 11. When does a waning moon occur? A) Just after a full moon. B) Just after a crescent moon. C) When all of the Moon's near side is dark. D) Between a first-quarter moon and a new moon. Show Answer Correct Answer: A) Just after a full moon. 12. Apparent magnitude is affected by a star's A) Distance from Earth. B) Size. C) Both distance and size. D) None of these. Show Answer Correct Answer: C) Both distance and size. 13. Which of the following describes rotation? A) Moving in a straight line. B) Moving around another object. C) Moving around in place in a circle. D) None of above. Show Answer Correct Answer: C) Moving around in place in a circle. 14. Which planet is the coldest? A) Neptune. B) Saturn. C) Uranus. D) Earth. Show Answer Correct Answer: C) Uranus. 15. How do the inner planets differ from the outer planets? A) They are made of lighter elements. B) They do not have any moons. C) They are extremely large. D) They are spaced more closely together. Show Answer Correct Answer: D) They are spaced more closely together. 16. Why do stars in a constellation seem to stay in one position? A) The Stars orbit the sun like the Earth does. B) The Stars do not orbit the sun or earth. C) The Stars orbit the earth like the moon. D) None of above. Show Answer Correct Answer: B) The Stars do not orbit the sun or earth. 17. Why is a space suit insulated? A) Regulate temperature-protect against hot/cold. B) To keep the astronaut from dehydrating. C) So they can use the bathroom in space. D) So they can breathe. Show Answer Correct Answer: A) Regulate temperature-protect against hot/cold. 18. The four inner planets are ..... A) Rocky and small. B) Very large and made of ice. C) Small and made of ice. D) Very large and made of gases. Show Answer Correct Answer: A) Rocky and small. 19. Why is Earth's magnetic field important to the survival of life? A) The magnetic field holds in oxygen, nitrogen, argon and carbon dioxide. B) The magnetic field is a like a bubble around the Earth. C) The magnetic field shields Earth from harmful particles that stream from the Sun. D) None of above. Show Answer Correct Answer: C) The magnetic field shields Earth from harmful particles that stream from the Sun. 20. How many stars are in the solar system? A) Millions. B) Billions. C) Thousands. D) One. Show Answer Correct Answer: D) One. ← PreviousNext →Related QuizzesScience QuizzesSolar System Quiz 1Solar System Quiz 2Solar System Quiz 3Solar System Quiz 4Solar System Quiz 5Solar System Quiz 6Solar System Quiz 7Solar System Quiz 8Solar System Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books