P3 General Studies: Hygiene And Infectious Diseases (Paper 4 (error Clinic))

P3 General Studies: Hygiene and Infectious Diseases (Paper 4 (error clinic))

2026-11-13

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 4 (error clinic))

Paper four retrains the commonest errors: drying hands, washing bottles, wearing masks, touching eyes and nose, and antibiotics against viruses.

Direct answers　For each item decide first whether it is a habit question or a calculation, then answer, and finally check the unit.

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)

FoundationHow should hands be dried after washing?
FoundationWhy should a water bottle be washed regularly?
FoundationWhy should you stay home and rest when you are ill?
IntermediateWhy cover the mouth and nose when coughing?
IntermediateWhat should be done with a mask that is wet or dirty?
IntermediateWhy should you not rub your eyes or pick your nose with your hands?
ChallengeFour of the 40 people in a classroom have chickenpox. What percentage is that?
ChallengeThere are 1000 germs on the hands and 100 are left after washing. By what percentage did they fall?
ChallengeWashing for 20 seconds each time, 6 times a day, how many seconds is that, and how many minutes?
Error redoSomeone says antibiotics make a cold clear up faster. What is wrong with that?

03　Answers and one-line notes

#	Answer	One-line note
1	Dry them with a paper towel or a clean towel.	Wet hands pick up germs more easily, so drying leaves fewer germs on the skin.
2	Germs build up on the inside of the bottle.	Water and sugar inside a bottle let germs grow, so it should be washed every day.
3	It reduces passing the germs on to classmates.	There are more germs in the body when ill, so staying among many people easily spreads them.
4	To stop droplets carrying the germs out.	Cough droplets can travel one or two metres, so covering up cuts the spread a great deal.
5	Replace it with a new one at once.	A wet mask no longer blocks droplets, and wearing it against the face is uncomfortable.
6	The moist skin of the eyes and nose is easily infected by germs on the hands.	That lining has no outer skin for protection, so even a few germs from the hand can start an infection.
7	10.0	Four divided by forty gives 0.1, that is 10.0 per cent.
8	90.0	That is 900 fewer, and 900 divided by 1000 gives 0.9, that is 90.0 per cent.
9	120 seconds, that is 2.0 minutes	Twenty times six gives 120 seconds, and dividing by sixty gives 2.0 minutes.
10	Antibiotics do nothing for a cold caused by a virus, and may lead to resistance.	Error to fix: antibiotics act on bacteria only, so using them for a virus brings side effects and resistance without any benefit.

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.

With all four done, go back to the chapter page and revise the three parts of a closed circuit plus three safety habits.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.