1. A dental surgeon appointed in rural health centre reports an increased incidence of dental
carries in the children of that are the relevant preventive measure that he should suggest to the
health authorities is:
a) Fluoridation of water
b) Chlorination of water
c) Use of bacterial filter
d) Use of boiled water
2. Chlorination of water was done by addition of bleaching powder solution containing 10%
available chlorine One hour contact time was ensure What is your recommendation regarding
use of this water for drinking?:
a) Fit for consumption
b) Use after 06 hours
c) Use after 12 hours
d) Rechlorinate
3. Water samples from two villages of Punjab were sent to Health laboratory for examination.
Lab reports show fluoride levels ranging from 5.26 to 6.32 mg/lit. Use of this water for drinking
may lead to:
a) Dental caries
b) Dental fluorosis
c) Gingivitis
d) Periodontitis
4. An out-break of scabies was reported in a Kachi abadi consisting of 500 people. The
appropriate preventive measures suggested by you would be to:
a) Filter the water
b) Improve accessibility to water
c) Destroy breeding sites of insects
d) Chlorinate water
5. A sample of water taken from a water storage tank of a residential area was to be examined
bacteriologically. A positive test of water sample by multiple tube method refers to the presence
of
a) Coli-form organisms
b) Fecal streptococci
c) Nitrites
d) Cl. Perfringens
6. An epidemic of gastroenteritis affected more than 500 people in a city. Samples of water were
taken from different sites of the supply system. Bacteriological examination was positive for coli
forms. Chemical analysis of water showed the presence of high fluoride, nitrate, chloride and ph
of 6. Which content is suggestive of water born epidemic
a) Nitrates
b) Chlorides
c) High pH
d) Coli-forms
7. Different agents are used for chlorination of water on large scale. If after chlorination taste
of water is not much altered; level of residual chlorine is more stable and persistent. The likely
agent to be used for chlorination was:
a) Bleaching powder
b) Chlorine gas
c) Chloramines
d) Perchloron
8. In a poor community, there is high prevalence of acute diarrhea cases. The best method for
preventing this health problem in the long run is:
a) Anti-diarrheal drugs.
b) Immunization against cholera and typhoid
c) Provision of sanitary latrine
d) Provision of sanitary latrine
9. Six of the ten family members living in a single room house complain of intense itching with
scratching in axillae, groin and hands; it is more marked at night. The most likely diagnosis is
a) Scabies
b) Dermatitis
c) Eczema
d) Psoriasis
10. In a house consisting of two living rooms, the door and windows are facing each other. This
will provide:
a) Low humidity
b) Aspiration
c) Cross ventilation
d) Diffusion