Earth And The Solar SystemCopy
1. How long does it take the Earth to orbit the Sun once?
A. 24 hours
B. 30 days
C. 365 days
D. 12 months
2. What is the shape of the Earth’s orbit around the Sun?
A. Perfect circle
B. Ellipse (approximately circular)
C. Rectangle
D. Spiral
3. How long does the Earth take to complete one rotation on its axis?
A. 365 days
B. 30 days
C. 12 hours
D. 24 hours
4. Why do we experience day and night on Earth?
A. The Earth’s orbit
B. Earth’s rotation on its axis
C. Revolution of the Moon
D. Tilt of Earth’s orbit
5. How long does it take the Moon to orbit the Earth once?
A. 24 hours
B. About one week
C. About one month
D. 365 days
6. How long does sunlight take to reach Earth?
A. 8 minutes 20 seconds
B. 5 seconds
C. 500 seconds
D. 50 seconds
7. What is the formula to calculate average orbital speed?
A. v = π r²
B. v = 2π r / T
C. v = T / 2π r
D. v = r / T
8. What does ‘r’ represent in the formula v = 2π r / T?
A. Radius of the Earth
B. Radius of the Sun
C. Average radius of the orbit
D. Rotational speed
9. What is the orbital period of the Earth?
A. 24 hours
B. 7 days
C. 1 year
D. 365 minutes
10. What is the only star in our Solar System?
A. Earth
B. Moon
C. Mars
D. Sun
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Physics Full Scale Course
11. Which of the following is the correct order of the eight planets from the Sun?
A. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
B. Earth, Venus, Mars, Mercury, Jupiter, Saturn, Uranus, Neptune
C. Venus, Mercury, Earth, Mars, Saturn, Jupiter, Neptune, Uranus
D. Mercury, Earth, Venus, Mars, Saturn, Jupiter, Uranus, Neptune
12. Pluto is classified as a:
A. Planet
B. Star
C. Dwarf planet
D. Asteroid
13. The asteroid belt lies between the orbits of:
A. Earth and Mars
B. Mars and Jupiter
C. Jupiter and Saturn
D. Saturn and Uranus
14. What are moons?
A. Small stars
B. Satellites that orbit planets
C. Planets that orbit stars
D. Icy comets
15. Comets typically have:
A. Circular orbits
B. Very small mass
C. Highly elliptical orbits
D. No gravitational field
16. Which of the following is true about gravitational field strength on a planet?
A. It increases with distance
B. It depends on the planet’s mass
C. It is the same for all planets
D. It is strongest at the poles only
17. As distance from a planet increases, the gravitational field strength:
A. Increases
B. Remains constant
C. Decreases
D. Becomes infinite
18. What contains most of the mass in the Solar System?
A. Earth
B. Jupiter
C. The Sun
D. Asteroid belt
19. Why is the gravitational field at the surface of the Sun greater than at any planet’s surface?
A. Because it is hotter
B. Because it is farther from other stars
C. Because it has more mass
D. Because it has more moons
20. What keeps planets in orbit around the Sun?
A. Planetary motion
B. Sunlight pressure
C. Gravitational attraction of the Sun
D. Magnetic fields
Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change O Level And IGCSE Physics Full Scale Course
21. The farther a planet is from the Sun, its orbital speed:
A. Increases
B. Decreases
C. Remains constant
D. Becomes zero
22. Why do outer planets have longer years than inner planets?
A. They move faster
B. Their orbits are more circular
C. They orbit slower and have longer distances
D. They don’t orbit the Sun
23. What type of body is the Moon?
A. Star
B. Natural satellite
C. Asteroid
D. Artificial satellite
24. Which body in the Solar System has the highest gravitational field strength?
A. Jupiter
B. Earth
C. Sun
D. Saturn
25. What is the direction of gravitational force acting on orbiting objects?
A. Away from the planet
B. At right angles to velocity
C. Toward the center of the orbit
D. Along the orbit
Answer key and explanations
1. Correct Answer: C
Explanation: The Earth takes approximately 365 days to orbit the Sun once.
2. Correct Answer: B
Explanation: Earth’s orbit is elliptical but very close to a circular shape.
3. Correct Answer: D
Explanation: Earth completes one full rotation on its axis every ~24 hours.
4. Correct Answer: B
Explanation: The rotation of the Earth causes day and night.
5. Correct Answer: C
Explanation: The Moon takes about one month (~27.3 days) to orbit the Earth.
6. Correct Answer: C
Explanation: Light from the Sun takes approximately 500 seconds (or ~8 minutes 20 seconds) to reach Earth.
7. Correct Answer: B
Explanation: The formula for orbital speed is: v = 2Ï€r / T
8. Correct Answer: C
Explanation: r represents the average radius of the orbit (distance from center to orbit path).
9. Correct Answer: C
Explanation: Earth completes one orbit in one year, which is the orbital period.
10. Correct Answer: D
Explanation: The Sun is the only star in our Solar System.
11. Correct Answer: A
Explanation: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune is the correct planetary order.
12. Correct Answer: C
Explanation: Pluto is classified as a dwarf planet.
13. Correct Answer: B
Explanation: The asteroid belt lies between the orbits of Mars and Jupiter.
14. Correct Answer: B
Explanation: Moons are natural satellites that orbit planets.
15. Correct Answer: C
Explanation: Comets typically have highly elliptical orbits, bringing them close to and far from the Sun.
16. Correct Answer: B
Explanation: Gravitational field strength on a planet’s surface depends on its mass.
17. Correct Answer: C
Explanation: As distance from a planet increases, gravitational field strength decreases.
18. Correct Answer: C
Explanation: The Sun holds over 99% of the Solar System’s total mass.
19. Correct Answer: C
Explanation: The Sun’s large mass means it has a very strong gravitational field at its surface.
20. Correct Answer: C
Explanation: The Sun’s gravity is what keeps planets in orbit around it.
21. Correct Answer: B
Explanation: Orbital speed decreases as distance from the Sun increases.
22. Correct Answer: C
Explanation: Outer planets are farther and move more slowly, so their orbital periods are longer.
23. Correct Answer: B
Explanation: The Moon is a natural satellite of the Earth.
24. Correct Answer: C
Explanation: The Sun has the highest gravitational field strength in the Solar System.
25. Correct Answer: C
Explanation: Gravitational force always acts toward the center of the orbit, pulling the object inward.