Solar System - Practice Test 3

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

1. Q1.Who discovered the planet Uranus?

   • A.Galileo
   • B.William Herschel✓ Correct Answer
   • C.Newton
   • D.Copernicus

   Explanation: Sir William Herschel discovered Uranus in 1781.

2. Q2.Which planet is farthest from the Sun?

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

   Explanation: Neptune is the farthest known planet. Pluto is a dwarf planet.

3. Q3.Which planet has the longest revolution period?

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

   Explanation: Neptune takes about 165 Earth years to orbit the Sun.

4. Q4.Triton is the largest moon of which planet?

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

   Explanation: Triton is Neptune's largest moon and orbits retrograde.

5. Q5.Pluto was reclassified as a 'Dwarf Planet' in which year?

   • A.2000
   • B.2005
   • C.2006✓ Correct Answer
   • D.2008

   Explanation: The International Astronomical Union (IAU) reclassified Pluto in 2006.

6. Q6.What separates the Inner Planets from the Outer Planets?

   • A.Kuiper Belt
   • B.Asteroid Belt✓ Correct Answer
   • C.Oort Cloud
   • D.Black Hole

   Explanation: The Asteroid Belt between Mars and Jupiter separates terrestrial (inner) and Jovian (outer) planets.

7. Q7.Which of the following is NOT a Terrestrial Planet?

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

   Explanation: Jupiter is a Gas Giant (Jovian), not a Terrestrial (rocky) planet.

8. Q8.The 'Kuiper Belt' is found beyond the orbit of:

   • A.Mars
   • B.Jupiter
   • C.Neptune✓ Correct Answer
   • D.Earth

   Explanation: The Kuiper Belt is a region of icy bodies beyond Neptune.

9. Q9.Halley's Comet is visible from Earth every:

   • A.50 years
   • B.76 years✓ Correct Answer
   • C.100 years
   • D.86 years

   Explanation: Halley's Comet has an orbital period of approximately 75-76 years.

10. Q10.Shooting stars are actually:

    • A.Stars
    • B.Comets
    • C.Meteors✓ Correct Answer
    • D.Planets

    Explanation: Shooting stars are meteors burning up in Earth's atmosphere.

11. Q11.Which planet has the strongest magnetic field?

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

    Explanation: Jupiter has the strongest magnetic field of all planets.

12. Q12.What is an Astronomical Unit (AU)?

    • A.Distance between Sun and Moon
    • B.Distance between Sun and Earth✓ Correct Answer
    • C.Distance between Earth and Moon
    • D.Distance between Sun and Mars

    Explanation: 1 AU is the average distance between the Sun and Earth (approx 150 million km).

13. Q13.Which planet is also called 'Winter Planet'?

    • A.Jupiter✓ Correct Answer
    • B.Mars
    • C.Jupiter (Repeated, error in source common, answer is Jupiter)
    • D.Jupiter

    Explanation: Jupiter is sometimes referred to as the winter planet due to its low average temperatures (-145°C), although this is a less common nickname.

14. Q14.The axis of Earth is tilted at an angle of:

    • A.23.5 degrees✓ Correct Answer
    • B.66.5 degrees
    • C.90 degrees
    • D.0 degrees

    Explanation: Earth's axis is tilted at 23.5 degrees relative to its orbital plane.

15. Q15.The rotation of Earth causes:

    • A.Seasons
    • B.Day and Night✓ Correct Answer
    • C.Tides only
    • D.Eclipses

    Explanation: Rotation causes the cycle of day and night.

16. Q16.The revolution of Earth around the Sun causes:

    • A.Day and Night
    • B.Tides
    • C.Seasons✓ Correct Answer
    • D.Winds

    Explanation: Revolution combined with axial tilt causes seasons.

17. Q17.When the Earth is closest to the Sun, it is called:

    • A.Aphelion
    • B.Perihelion✓ Correct Answer
    • C.Solstice
    • D.Equinox

    Explanation: Perihelion occurs around January 3rd when Earth is closest.

18. Q18.When the Earth is farthest from the Sun, it is called:

    • A.Aphelion✓ Correct Answer
    • B.Perihelion
    • C.Solstice
    • D.Equinox

    Explanation: Aphelion occurs around July 4th.

19. Q19.Ganymede, the largest moon, belongs to:

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

    Explanation: Ganymede is a moon of Jupiter.

20. Q20.Which planet is known as the 'Gas Giant'?

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

    Explanation: Jupiter, Saturn, Uranus, and Neptune are Gas Giants, with Jupiter being the prime example.