Our Solar System – Best 20+ MCQs for Competitive Exams
1. The Solar System consist of ____________.
Correct Answer: B. The Sun, planets, their moons, and other celestial bodies
Explanation: The Solar System includes the Sun, planets, their satellites, asteroids, meteoroids, and comets.
2. The name of our planetary system is ________.
Correct Answer: C. Solar System
Explanation: Our planetary system is called the Solar System, which revolves around the Sun.
3. The word “Solar” comes from the Latin word “Solis,” which means _____.
Correct Answer: D. Sun
Explanation: “Solar” is derived from the Latin word Solis, meaning Sun.
4. Our Solar System is located _______ galaxy.
Correct Answer: C. Milky Way Galaxy
Explanation: The Solar System is part of the Milky Way Galaxy.
5. The Solar System orbits the center of the Milky Way Galaxy at approximately _____ mph.
Correct Answer: C. 515,000 mph
Explanation: The Solar System moves around the galactic center at about 515,000 miles per hour.
6. How long does it take the Solar System to complete one orbit around the galactic center?
Correct Answer: B. 230 million years
Explanation: The Solar System completes one galactic orbit in about 230 million years.
7. What lies beyond Neptune’s orbit in our Solar System?
Correct Answer: A. Kuiper Belt
Explanation: The Kuiper Belt lies beyond Neptune’s orbit.
8. The giant spherical shell surrounding our Solar System is called the:
Correct Answer: C. Oort Cloud
Explanation: The Oort Cloud surrounds the Solar System.
9. The Oort Cloud represents the boundary of ______.
Correct Answer: B. Sun’s gravitational influence
Explanation: The Oort Cloud marks the outer boundary of the Sun’s gravity.
10. Scientists have discovered billions of planetary systems with stars similar to our Sun in the _____.
Correct Answer: C. Milky Way Galaxy
Explanation: Billions of planetary systems exist within the Milky Way Galaxy.
11. The number of planets in our Solar System are _____.
Correct Answer: B. 8
Explanation: There are eight planets in the Solar System — from Mercury to Neptune.
12. Starting from the Sun, which of the following lists the planets in correct order?
Correct Answer: B. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Explanation: The correct order from the Sun is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
13. All planets revolve around the Sun in their ______.
Correct Answer: A. Orbits
Explanation: Each planet moves around the Sun in a fixed elliptical orbit due to gravitational attraction.
14. Meteorite analysis shows that the Solar System is about ______ years old.
Correct Answer: B. 4530 million
Explanation: Scientists estimate the Solar System’s age to be around 4.53 billion years.
15. The Sun is ________.
Correct Answer: C. An average-sized star
Explanation: The Sun is a medium-sized star compared to other stars in the Milky Way Galaxy.
16. The Sun’s position in the Milky Way Galaxy is ________.
Correct Answer: C. Shifted towards one side
Explanation: The Sun is not at the center of the Milky Way but located off to one side in a spiral arm.
17. The planets and their moons receive light and heat from _____.
Correct Answer: D. The Sun
Explanation: The Sun is the main source of light and heat for all planets and moons in the Solar System.
18. The four inner planets of the Solar System are called __________.
Correct Answer: C. Terrestrial planets
Explanation: Mercury, Venus, Earth, and Mars are called terrestrial planets because they are rocky.
19. The inner planets are called terrestrial planets. Why?
Correct Answer: A. Because of their rocky composition
Explanation: The inner planets are rocky in nature, hence called terrestrial planets (Earth-like).
20. The outer planets in our solar system are known as _____________.
Correct Answer: C. Gaseous planets
Explanation: Jupiter, Saturn, Uranus, and Neptune are gaseous planets in our solar system due to their thick gas envelopes.
21. The Outer planets in our solar system are called gaseous planets. Why?
Correct Answer: C. They lack solid surfaces and are made of gases
Explanation: Outer planets in our solar system are composed mostly of hydrogen and helium and have no solid surface.