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P3 General Studies: Hygiene and Infectious Diseases (Paper 1 (basics))
Tutor Prep Guide · conductors and insulators, power and electricity cost, series and parallel circuits, fuses and earth protection, and safe habits at home
P3 General Studies: Hygiene and Infectious Diseases (Paper 1 (basics))
Paper one covers the most basic hygiene habits: washing with soap, covering sneezes, washing before eating and after the toilet, and reading infection numbers as percentages.
Direct answers For each item ask first where the germs come from, then work out the percentage, and finally check whether the unit is per cent or a count.
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: P3 General Studies: Hygiene and Infectious Diseases |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationWhy should we wash our hands with soap and water?
- FoundationWhat should you do when you sneeze?
- FoundationWhat usually causes an infectious disease?
- IntermediateFor how many seconds at least should you rub your hands when washing?
- IntermediateAt which two times must you wash your hands?
- IntermediateWhy should you not share a towel with classmates?
- ChallengeA class of 40 pupils has 8 pupils with flu. What percentage of the class is that?
- ChallengeBefore washing there were 500 germs on the hands and afterwards 50 are left. By what percentage did the germs fall?
- ChallengeEach millilitre of water holds 200 germs. How many germs are taken in by drinking 3 millilitres?
- Error redoSomeone says hands that look clean carry no germs. What is wrong with that?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Soap carries the germs away from the skin. | Water alone does not remove the oil and dirt, so soap lifts them off together with the germs. |
| 2 | Cover your mouth and nose with a tissue, then wash your hands. | Droplets carry germs, so covering up reduces the spread and washing removes what is left. |
| 3 | Germs, including bacteria and viruses. | Infectious diseases come from germs that spread, such as flu viruses and food poisoning bacteria. |
| 4 | 20 seconds. | Twenty seconds of rubbing gives the soap time to lift the germs off the skin. |
| 5 | Before eating and after using the toilet. | Washing before eating keeps germs out of the mouth, and washing afterwards stops germs spreading from the hands. |
| 6 | A towel picks up germs, so sharing passes them between people. | Germs stay on the towel, so sharing it means exchanging germs with others. |
| 7 | 20.0 | Eight divided by forty gives 0.2, that is 20.0 per cent. |
| 8 | 90.0 | 450 fewer, and 450 divided by 500 gives 0.9, that is 90.0 per cent. |
| 9 | 600 | 200 times 3 gives 600, so multiply the germ count by the volume drunk. |
| 10 | Germs cannot be seen, so clean-looking hands may still carry them. | Error to fix: clean is only how it looks. Germs need a microscope, so hands must be washed anyway. |
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.
After paper one, take paper two and sort out series against parallel in one pass.Tutor Registration →
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