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Primary General Studies: Earth, Moon and Sun (Paper 1 (basics))
Primary General Studies: Earth, Moon and Sun (Paper 1 (basics))
This paper separates spin, orbit and reflected light, then uses distance and speed to work out light travel times.
Direct answers Answers are listed directly; show the working for calculations and the key term for concepts.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: Primary General Studies: Earth, Moon and Sun |
| Level | P5 |
02 Questions (10 items)
- FoundationAbout how long does Earth take to spin once on its axis?
- FoundationAbout how long does Earth take to orbit the Sun once?
- FoundationDoes the Moon make its own light?
- IntermediateAs seen from Hong Kong, which side does the Sun rise from?
- IntermediateAbout how many days does the Moon take to orbit Earth once?
- IntermediateWhat is the boundary between day and night on Earth called?
- ChallengeThe Moon is about 384,400 km away and light travels 300,000 km per second. About how many seconds does moonlight take to reach Earth?
- ChallengeEarth is about 149,600,000 km from the Sun. About how many minutes does sunlight take to reach us, to one decimal place?
- ChallengeA day has 24 hours. How many hours are there in one week?
- Error redoA classmate says the orbit around the Sun causes day and night. What is the correct statement?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | About 24 hours. | One spin makes one day, which is why day and night keep changing. |
| 2 | About 365 days, which is one year. | One orbit makes one year, and the tilted axis brings the four seasons. |
| 3 | No. It only reflects sunlight. | Because the Moon has no light of its own, the lit part we see changes and gives us moon phases. |
| 4 | It rises in the east and sets in the west. | Earth spins from west to east, so the Sun only appears to travel across the sky. |
| 5 | About 27.3 days. | Its spin period matches its orbital period, so the same face always points at Earth. |
| 6 | It is called the terminator. | The two sides of the terminator are day and night, and it moves as Earth spins. |
| 7 | About 1.28 seconds. | Time is distance divided by speed, so 384,400 divided by 300,000 is about 1.28 seconds. |
| 8 | About 8.3 minutes. | 149,600,000 divided by 300,000 is about 499 seconds, and 499 divided by 60 is 8.3 minutes. |
| 9 | 168 hours. | 24 times 7 is 168, the total spinning time in a week. |
| 10 | Day and night come from the spin, while the orbit gives the seasons. | The spin takes about 24 hours and the orbit about 365 days, so the two effects must not be mixed up. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
A spin of about 24 hours gives day and night while a 365 day orbit with a 23.5 degree tilt gives the seasons, and eclipses happen at new moon or full moon.Tutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.