Solar System: 17 MCQs with answers
All 17 multiple-choice questions from this kit, free and with no sign-up.
Warm-up · 9 questions
Q1. Which planet is closest to the Sun?
BeginnerShow answer & explanation
Mercury
Mercury is the first planet from the Sun, orbiting at an average distance of about 58 million km.
Q2. What is the largest planet in our Solar System?
BeginnerShow answer & explanation
Jupiter
Jupiter is the largest planet, with a diameter about 11 times that of Earth.
Q3. Which planet is known as the Red Planet?
BeginnerShow answer & explanation
Mars
Mars appears red due to iron oxide (rust) on its surface.
Q4. Which planet has the most prominent ring system?
BeginnerShow answer & explanation
Saturn
Saturn's rings are the largest and most visible, made mostly of ice particles.
Q5. What is the name of the galaxy that contains our Solar System?
BeginnerShow answer & explanation
Milky Way
Our Solar System is located in the Milky Way galaxy.
Q6. What force keeps the planets in orbit around the Sun?
BeginnerShow answer & explanation
Gravity
Gravity is the attractive force that governs planetary orbits.
Q7. What is the Sun?
BeginnerShow answer & explanation
A star
The Sun is a star, specifically a G-type main-sequence star.
Q8. The Moon produces its own light.
BeginnerShow answer & explanation
False
The Moon does not produce its own light; it reflects sunlight.
Q9. Jupiter is the largest planet in our Solar System.
BeginnerShow answer & explanation
True
Jupiter is the largest planet, with a mass more than twice that of all other planets combined.
Building up · 7 questions
Q10. What is the Sun primarily made of?
IntermediateShow answer & explanation
Hydrogen and helium
The Sun is composed mainly of hydrogen (~74%) and helium (~24%).
Q11. Which of these is NOT a terrestrial planet?
IntermediateShow answer & explanation
Jupiter
Jupiter is a gas giant, while Mercury, Venus, and Mars are terrestrial (rocky) planets.
Q12. How long does it take for the Moon to complete one orbit around Earth?
IntermediateShow answer & explanation
About 27.3 days
The Moon's sidereal orbital period is approximately 27.3 days.
Q13. Which planet is known for its extreme greenhouse effect, making it the hottest?
IntermediateShow answer & explanation
Venus
Venus has a thick CO₂ atmosphere that traps heat, resulting in surface temperatures around 465°C.
Q14. Which planet rotates on its side, likely due to a massive collision?
IntermediateShow answer & explanation
Uranus
Uranus has an axial tilt of about 98°, so it essentially rotates on its side.
Q15. Which of the following is a dwarf planet?
IntermediateShow answer & explanation
Pluto
Pluto, Ceres, and Eris are all dwarf planets, but the question asks for one; Pluto is the most well-known.
Q16. Which planet has the shortest year?
IntermediateShow answer & explanation
Mercury
Mercury orbits the Sun in just 88 Earth days, the shortest orbital period among the planets.
Topper level · 1 questions
Q17. What is the main reason Mercury experiences extreme temperature variations?
AdvancedShow answer & explanation
It has no atmosphere to trap heat
Mercury lacks a substantial atmosphere, so it cannot retain heat, leading to scorching days and freezing nights.
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