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Chapter: 3 / Q: 6
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:
Chapter: 3 / Q: 7
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?
Chapter: 3 / Q: 8
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
Chapter: 3 / Q: 9
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:
Chapter: 3 / Q: 10
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?
Chapter: 3 / Q: 11
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:
Chapter: 3 / Q: 12
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:
Chapter: 3 / Q: 13
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
Chapter: 3 / Q: 14
An epidemic of gastroenteritis affected more than 500 people 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. Whic
Chapter: 3 / Q: 15
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:
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