1. In Sir-Syed Model School a student of class 3 developed measles. The child was isolated from
rest of the class. The school medical officer advised for the contest of this child:
a) Active immunization within 3 days
b) Passive immunization
c) Chemoprophylaxis
d) Isolation
2. A primigravida delivered a baby boy in the obstetric ward of POF hospital the doctor referred
the baby on the same day to the EPI centre for vaccination of:
a) BCH only
b) BCG OPV
c) DPT only
d) DPT HBV +OPV
3. The population living in Wah Cantt is using water from a deep spring, which is considered to
be relatively free from organic contamination but rich in calcium bicarbonates and sulphates. On
account of properties that spring water has, protects people from:
a) Gastroenteritis
b) Ancylostomiasis
c) Atherosclerosis
d) Renal problem
4. A well was present in a rural area where an unsanitary bore-hole latrine with lots of flies was
present within 10 feet of distance. The disease more likely to be transmitted through drinking
this well water is:
a) Leishmaniasis
b) Typhoid
c) Dental caries
d) Ancylostomiasis
5. If a child has been drinking water containing 30 mg/L of nitrates the condition likely to occur
is:
a) Infantile Methemoglobinemia
b) E-coli enteritis
c) Botulism
d) Dental caries
6. Required amount of chlorine was added to a large body of water after sedimentation. The pH
of water was 4.0 and level of sulphides was negligible. A contact period of one hour was ensure
Eventually, it was found that chlorination was not successful. The likely reason was:
a) Low pH
b) Less contact time
c) Less amount of chlorine
d) Suspended impurities
7. People of a village reported a high prevalence of bacterial gastroenteritis even after proper
chlorination of water supply for the recommended duration. On water analysis, level of chlorine
in water was 0.01 mg/L and pH of water was 6.5. There were no suspended impurities; levels of
sulphides and ferrous were low. The likely reason of increased bacterial gastroenteritis even after
chlorination is:
a) Low residual chlorine
b) High pH leading to chlorination failure
c) Presence of sulphides
d) Low level of ferrous
8. A water sample was taken from a source where catchment area included a large agricultural
land. It was declared unfit for human consumption on account of raised concentration of a
chemical. The likely chemical which has resulted in making this water unfit is
a) Iodine
b) Calcium
c) Zinc
d) Nitrite
9. During a sanitary inspection of a rapid sand filtration plant, slowing of the filtration rate was
observed owing to loss of head. Which method will you suggest to give head to water in such a
situation?
a) Addition of alum
b) Scraping the top layer
c) Increasing duration of storage
d) Back washing of sand bed
10. You were required to chlorinate well water; you added required amount of bleaching powder
solution to the water and allowed an overnight contact tim What is your recommendation
regarding consumption of this water for drinking.
a) Fit for consumption
b) To be used after 12 hours
c) To be used after another 24 hours
d) Rechlorinate