The Earth Quiz
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5 questions, one answer each
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1. The Earth rotates on its axis once every approximately 24 hours. Which of the following best explains why we experience day and night?
- A. Different parts of the Earth face towards and away from the Sun as it rotates
- B. The Earth's orbit around the Sun causes half the planet to be in shadow
- C. The Moon blocks sunlight during the night
- D. The Earth's tilted axis prevents sunlight from reaching certain regions
2. Why do the seasons occur on Earth approximately every 3 months?
- A. The Moon's orbit affects the Earth's temperature
- B. The Earth's tilted axis remains at a constant angle whilst it orbits the Sun over 365 days
- C. The Sun moves closer and farther from the Earth
- D. The Earth rotates at different speeds throughout the year
3. The Moon orbits the Earth approximately once every month. What does this explain about the Moon's appearance from Earth?
- A. Why the Moon always shows the same face to Earth
- B. The periodic changes in the Moon's phases as it orbits
- C. Why solar eclipses occur every month
- D. The variation in the Moon's distance from Earth
4. Using the equation v = 2πr/T, calculate the average orbital speed of an object orbiting at a radius of 1.5 × 10¹¹ m with a period of 3.15 × 10⁷ seconds.
- A. 3.0 × 10⁴ m/s
- B. 4.7 × 10⁴ m/s
- C. 6.3 × 10⁴ m/s
- D. 9.4 × 10⁴ m/s
5. If a planet has an orbital radius twice that of Earth's but maintains the same average orbital speed, how does its orbital period compare to Earth's?
- A. It is twice as long
- B. It is four times as long
- C. It is half as long
- D. It is the same length