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Primary General Studies, People and the Environment, Paper 1: recycling, the water cycle and energy
Primary General Studies, People and the Environment, Paper 1: recycling, the water cycle and energy
Ten items on the three recycling bins, the water cycle, renewable energy, planting trees, saving electricity, home water use and LED power.
Focus Blue takes paper, yellow takes cans and brown takes plastic bottles; the water cycle is evaporation, condensation, precipitation and run-off; solar power is renewable; trees absorb carbon dioxide; switching off saves power and carbon; watts times hours over 1000 gives kWh.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 25 |
| Difficulty mix | Foundation 4 · Intermediate 3 · Challenge 2 · Error redo 1 |
| Chapter | Chapter: Primary General Studies: People and the Environment |
| Level | P4 to P6 |
02 Questions (10 items)
- FoundationWhat do the blue, yellow and brown recycling bins collect in Hong Kong?
- FoundationWhat is the first step of the water cycle?
- FoundationWhich of these is a renewable energy source: solar energy, coal or oil?
- FoundationWhat are the benefits of planting trees?
- IntermediateWhy should you switch off lights and air conditioning when leaving a room?
- IntermediateA family of four flushes 5 times each a day at 6 L a flush. How much water is that per day?
- IntermediateAn 8-minute shower uses 10 L a minute. How much water is used?
- ChallengeAn 8 W LED lamp runs 5 hours a day for 30 days. How many kWh is that?
- ChallengeHow does light pollution at night affect wildlife?
- Error redoError fix: anything put in a recycling bin can be recycled. What is correct?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Blue for waste paper, yellow for aluminium cans (metal) and brown for plastic bottles. | The three bins sort by material, and items must be clean or they spoil the batch. |
| 2 | Evaporation: water from the sea and ground rises as vapour. | The water cycle runs evaporation, condensation, precipitation and run-off. |
| 3 | Solar energy. | Solar, wind and water power are replenished naturally; coal and oil are not. |
| 4 | They take in carbon dioxide, give out oxygen and provide shade that cools the air. | Trees absorb carbon dioxide in photosynthesis, which slows climate change. |
| 5 | To save electricity and cut the pollution and carbon released by power stations. | Most Hong Kong electricity comes from fossil fuels, so less use means less carbon. |
| 6 | 120 L (4 × 5 × 6). | Four people times five flushes times 6 L gives 120 L. |
| 7 | 80 L. | Eight minutes times 10 L gives 80 L, and shorter showers save most. |
| 8 | 8 × 5 × 30 ÷ 1000 = 1.2 kWh. | Watts times hours divided by 1000 gives 1200 ÷ 1000 = 1.2 kWh. |
| 9 | It disrupts their day-night rhythm and their feeding and migration direction. | Many birds and insects navigate by starlight, so bright light makes them lose their way. |
| 10 | Only clean, uncontaminated recyclables can be recycled; mixed or dirty waste must be sorted first. | Greasy paper and food-stained bottles spoil a whole batch, so clean and sort first. |
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.
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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.
