1. Question 1 of 25

   Sterilising glassware in a hot-air oven is commonly done at

   A 160 degrees Celsius for 2 hours B 60 degrees Celsius for 2 minutes C 100 degrees Celsius for 1 minute D 30 degrees Celsius for 1 day
2. Question 2 of 25

   Which of the following diseases is spread mainly by the faecal-oral route?

   A Hepatitis A B Dengue C Malaria D Measles
3. Question 3 of 25

   Phenol (carbolic acid) was introduced as a surgical antiseptic by

   A Louis Pasteur B Joseph Lister C Robert Koch D Edward Jenner
4. Question 4 of 25

   Which of these is a disinfectant commonly used in households?

   A Phenyl or bleach solution B Distilled water C Sugar solution D Cooking oil
5. Question 5 of 25

   Alcohol-based hand sanitisers are effective at about

   A 60 to 70 per cent alcohol B 5 per cent alcohol C 20 per cent alcohol D 100 per cent only
6. Question 6 of 25

   To make drinking water microbiologically safe at home, it should be

   A Left in the sun for 5 minutes B Stirred with a spoon C Cooled and covered D Brought to a rolling boil for at least 1 minute
7. Question 7 of 25

   Pasteurisation of milk (HTST) is done at about

   A 72 degrees Celsius for 15 seconds B 100 degrees Celsius for 1 hour C 40 degrees Celsius for 5 minutes D 0 degrees Celsius for 1 day
8. Question 8 of 25

   The most effective way to prevent the spread of diarrhoea is

   A Drinking cold water B Handwashing with soap C Wearing a mask D Using perfume
9. Question 9 of 25

   In waste segregation, vegetable peels belong with

   A Non-biodegradable waste B Hazardous waste C Electronic waste D Biodegradable waste
10. Question 10 of 25

    The recommended minimum residual free chlorine in treated drinking water at the point of delivery is about

    A 20 to 50 mg per litre B 0.2 to 0.5 mg per litre C 200 mg per litre D 0 mg per litre
11. Question 11 of 25

    Which of the following would NOT be reliably killed by ordinary boiling at 100 degrees Celsius for a few minutes?

    A Vibrio cholerae B Salmonella Typhi C Bacterial spores D Rotavirus
12. Question 12 of 25

    Typhoid fever is caused by

    A Vibrio cholerae B Salmonella Typhi C Plasmodium vivax D Rhinovirus
13. Question 13 of 25

    Sterilisation differs from disinfection in that sterilisation

    A Kills only some bacteria B Destroys all microorganisms including spores C Is used only on skin D Uses only soap
14. Question 14 of 25

    A septic tank treats household sewage mainly by

    A Anaerobic bacterial decomposition B Boiling C Filtration through cloth D Burning
15. Question 15 of 25

    Composting is the

    A Burning of waste B Burying plastics C Natural decomposition of organic waste into manure D Melting of glass
16. Question 16 of 25

    Dengue is spread by the Aedes mosquito, which breeds in

    A Dry deserts B Clean stagnant water in containers, tyres and coolers C Salty seawater only D Fast-flowing rivers
17. Question 17 of 25

    An antiseptic is a chemical that

    A Is used only on floors B Kills only viruses C Is a type of detergent D Can be used on living tissue to prevent infection
18. Question 18 of 25

    For disinfecting household surfaces, diluted bleach solution is commonly prepared at about

    A 10 per cent sodium hypochlorite B 0.0001 per cent sodium hypochlorite C 0.1 per cent sodium hypochlorite D 50 per cent sodium hypochlorite
19. Question 19 of 25

    Ultraviolet (UV) light kills microbes mainly by

    A Boiling them B Making water acidic C Making them dry D Damaging their DNA
20. Question 20 of 25

    Cholera is caused by the bacterium

    A Salmonella Typhi B Plasmodium C Mycobacterium tuberculosis D Vibrio cholerae
21. Question 21 of 25

    Solar disinfection (SODIS) of water involves exposing clear plastic bottles of water to sunlight for about

    A 6 minutes B 1 minute C 6 hours D 6 days
22. Question 22 of 25

    WASH in public health stands for

    A Waste, Air, Soap and Health B Water, Air, Soil and Heat C Wash And Sterilise Hands D Water, Sanitation and Hygiene
23. Question 23 of 25

    Filtering water through a clean cloth or sand filter mainly removes

    A All dissolved salts B All bacteria and viruses C Suspended particles but not all microbes D Dissolved gases
24. Question 24 of 25

    Oral rehydration solution (ORS) is used to

    A Kill the bacteria B Cure malaria C Replace water and salts lost in diarrhoea D Reduce fever
25. Question 25 of 25

    An autoclave sterilises equipment using

    A Steam under pressure at about 121 degrees Celsius for 15 minutes B Dry air at 50 degrees Celsius C Cold water D Sunlight only

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