A. Water is safe to be consumed B. Water is of doubtful quality
C. Water is of highly doubtful quality
D. Water is contaminated E. Water is highly contaminated
11. Bacteriological analysis of tap water has resulted in the following: total bacterial count in 1,0 ml of water is 80, coli index is 3. What would be the conclusion?
A. The water is safe for consumption B. The water quality is doubtful
C. The water quality is extremely doubtful
D. The water is polluted
E. The water is extremely polluted
12. A laboratory received a sample of water used in drug production for sanitary and viral analysis. What group of viruses will indicate fecal contamination of water and thus the need for its additional purification?
A. Picornaviridae B. Herpesviridae C. Flaviviridae
D. Retroviridae E. Orthomyxoviridae
13. In an urban settlement situated on the riverbank, an outbreak of hepatitis A was registered. The disease might have water origin. This assumption can be confirmed by growth of the following values of water quality:
A. Number of coli-phages B. Escherichia coli index
C. Oxidability D. Index of fecal coli-forms
E. Presence of benign leptospirosis pathogen
14. Basing upon the data of laboratory assessment of sanitary state of soil in a certain territory, the soil was found to be low-contaminated according to the sanitary indicative value; contaminated according to the coli titer; low-contaminated according to the anaerobe titer (Cl. perfringens). This is indicative of:
A. Fresh fecal contamination B. Old fecal contamination
C. Insufficient intensity of soil humification
D. Constant entry of organic protein contaminations
E. Insufficient insolation and aeration of soil
15. After the water supply system had been put into operation in a new residential area, the medical officers of sanitary and epidemiological station measured total microbial number in the water. Name the maximum permissible value of this indicator for potable water:
A. 1000. B. 500. C. 400. D. 100. E. 10.
16. A bacteriological laboratory conducts the analysis of potable water quality. Microbial number of the water sample is approximately 100. What microorganisms were accounted for in this case?
E. All bacteria that have grown on a nutrient mediumB. Opportunistic pathogenic bacteria
C. Enteropathogenic bacteria and viruses D. Colibacilli
E. Human and animal pathogenic bacteria
