Universe - Practice Test 2

Attempt the quiz above first, then review every question with its correct answer and a short explanation below.

1. Q1.How many planets are there in our Solar System?

   • A.7
   • B.8✓ Correct Answer
   • C.9
   • D.10

   Explanation: There are 8 planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto was reclassified in 2006.

2. Q2.Which planet is closest to the Sun?

   • A.Venus
   • B.Mercury✓ Correct Answer
   • C.Mars
   • D.Earth

   Explanation: Mercury is the closest planet to the Sun.

3. Q3.Which planet is known as 'Earth's Twin'?

   • A.Mars
   • B.Venus✓ Correct Answer
   • C.Uranus
   • D.Neptune

   Explanation: Venus is called Earth's twin because of their similar size, mass, and density.

4. Q4.Which is the hottest planet in the Solar System?

   • A.Mercury
   • B.Venus✓ Correct Answer
   • C.Mars
   • D.Jupiter

   Explanation: Venus is the hottest due to its thick atmosphere comprising mostly carbon dioxide (Greenhouse Effect).

5. Q5.Which two planets rotate from East to West (Retrograde Rotation)?

   • A.Venus and Uranus✓ Correct Answer
   • B.Venus and Mars
   • C.Uranus and Neptune
   • D.Mercury and Venus

   Explanation: Venus and Uranus rotate clockwise (East to West), opposite to other planets.

6. Q6.Which planet is known as the 'Red Planet'?

   • A.Jupiter
   • B.Saturn
   • C.Mars✓ Correct Answer
   • D.Venus

   Explanation: Mars is called the Red Planet due to the presence of Iron Oxide on its surface.

7. Q7.Which planet has the highest number of moons (as of recent data)?

   • A.Jupiter
   • B.Saturn✓ Correct Answer
   • C.Uranus
   • D.Mars

   Explanation: Saturn has the most moons (146 recognized), surpassing Jupiter.

8. Q8.The largest planet in our Solar System is:

   • A.Saturn
   • B.Jupiter✓ Correct Answer
   • C.Neptune
   • D.Uranus

   Explanation: Jupiter is the largest planet in both mass and volume.

9. Q9.The 'Great Red Spot' is a prominent feature of which planet?

   • A.Mars
   • B.Jupiter✓ Correct Answer
   • C.Saturn
   • D.Venus

   Explanation: The Great Red Spot is a persistent high-pressure region (storm) on Jupiter.

10. Q10.Which planet is famous for its beautiful rings?

    • A.Jupiter
    • B.Saturn✓ Correct Answer
    • C.Uranus
    • D.Neptune

    Explanation: Saturn has the most extensive and visible ring system made of ice and rock particles.

11. Q11.The 'Asteroid Belt' is located between which two planets?

    • A.Earth and Mars
    • B.Mars and Jupiter✓ Correct Answer
    • C.Jupiter and Saturn
    • D.Saturn and Uranus

    Explanation: The Asteroid Belt is found between the orbits of Mars and Jupiter.

12. Q12.Which planet is called the 'Blue Planet'?

    • A.Earth✓ Correct Answer
    • B.Neptune
    • C.Uranus
    • D.Venus

    Explanation: Earth is called the Blue Planet due to the abundance of water on its surface.

13. Q13.Which planet is known as the 'Morning Star' or 'Evening Star'?

    • A.Mercury
    • B.Venus✓ Correct Answer
    • C.Mars
    • D.Jupiter

    Explanation: Venus is the brightest natural object in Earth's sky after the Moon, often visible at dawn or dusk.

14. Q14.Which planet looks greenish due to the presence of Methane?

    • A.Saturn
    • B.Uranus✓ Correct Answer
    • C.Mars
    • D.Venus

    Explanation: Uranus (and Neptune) appears blue-green because methane gas in its atmosphere absorbs red light.

15. Q15.The largest satellite (moon) in the Solar System is:

    • A.Titan
    • B.Ganymede✓ Correct Answer
    • C.Callisto
    • D.Io

    Explanation: Ganymede, a moon of Jupiter, is the largest moon in the solar system.

16. Q16.Titan is the largest moon of which planet?

    • A.Jupiter
    • B.Saturn✓ Correct Answer
    • C.Uranus
    • D.Neptune

    Explanation: Titan is the largest moon of Saturn.

17. Q17.Which planet has the fastest revolution period (shortest year)?

    • A.Mercury✓ Correct Answer
    • B.Venus
    • C.Earth
    • D.Mars

    Explanation: Mercury revolves around the Sun in just 88 days.

18. Q18.Which planets have no satellites (moons)?

    • A.Mercury and Venus✓ Correct Answer
    • B.Venus and Mars
    • C.Mercury and Mars
    • D.Neptune and Pluto

    Explanation: Mercury and Venus are the only planets in our solar system with no natural satellites.

19. Q19.What is the name of the galaxy closest to the Milky Way?

    • A.Andromeda✓ Correct Answer
    • B.Triangulum
    • C.Canis Major
    • D.Ursa Minor

    Explanation: The Andromeda Galaxy is the nearest spiral galaxy to the Milky Way.

20. Q20.The path of planets around the Sun is:

    • A.Circular
    • B.Elliptical✓ Correct Answer
    • C.Zig-zag
    • D.Spiral

    Explanation: According to Kepler's First Law, planets orbit the Sun in an elliptical path.