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Primary General Studies: Earth, Moon and Sun (Paper 2 (intermediate))
Primary General Studies: Earth, Moon and Sun (Paper 2 (intermediate))
This paper links phases, gravity and body sizes, all handled with division and ratios, with units required.
Direct answers Write the formula, put in the numbers, then check that the unit matches the question.
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 many days is one cycle of moon phases?
- FoundationThe Moon is about 3,476 km across and Earth about 12,742 km. Earth is about how many times wider than the Moon, to one decimal place?
- FoundationThe Sun is about 1,392,000 km across and Earth about 12,742 km. The Sun is about how many times wider than Earth, to the nearest whole number?
- IntermediateA person weighs 60 kg on Earth, and gravity on the Moon is about one sixth of that. About what would the person weigh on the Moon?
- IntermediateA phase cycle lasts 29.5 days. About how many weeks is that, to one decimal place?
- IntermediateA year has 12 months. Using 365 days, about how many days are there in an average month, to one decimal place?
- ChallengeA 29.5 day phase cycle is split into four main phases. How many days does each phase last on average, to one decimal place?
- ChallengeEarth turns 15 degrees every hour. How many degrees does it turn in one full spin?
- ChallengeThe Moon orbits Earth every 27.3 days. About how many orbits are there in 365 days, to one decimal place?
- Error redoA classmate says moon phases are made by the shadow of Earth falling on the Moon. What is the correct explanation?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | About 29.5 days. | From one new moon to the next is about 29.5 days, a little longer than the 27.3 day orbit. |
| 2 | About 3.7 times. | 12,742 divided by 3,476 is about 3.7, so Earth is clearly the larger body. |
| 3 | About 109 times. | 1,392,000 divided by 12,742 is about 109, which shows how much larger the Sun is. |
| 4 | About 10 kg. | 60 divided by 6 is 10. The mass stays the same but the weight drops, so jumps go much higher. |
| 5 | About 4.2 weeks. | 29.5 divided by 7 is about 4.2, so a lunar month is a little longer than four weeks. |
| 6 | About 30.4 days. | 365 divided by 12 is about 30.4, so months differ in length but average about 30.4 days. |
| 7 | About 7.4 days. | 29.5 divided by 4 is about 7.4, so the phase changes a little more often than once a week. |
| 8 | 360 degrees. | 15 times 24 is 360, which is exactly one full turn. |
| 9 | About 13.4 orbits. | 365 divided by 27.3 is about 13.4, which is why a lunar year has about 12 or 13 months. |
| 10 | Phases come from the changing angle at which we see the sunlit half of the Moon, not from any shadow of Earth. | The shadow of Earth reaches the Moon only during a lunar eclipse, so ordinary phases are not eclipses. |
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 →
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