E-PolyLearning

1. Which of the following forms of water is the most contaminated?
a. Underground water
b. Rainwater
c. Surface water
d. Water stored in ice caps
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Answer: (c).Surface water

2. Alum is used for which of the following purification process?
a. Sedimentation
b. Filtration
c. Disinfection
d. Ozonation
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Answer: (a).Sedimentation

3. The potability of water can be checked by sanitary surveys.
a. True
b. False
c. May be
d. Can't say
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Answer: (b).False

4. The coliform group of bacteria includes all the __________________ bacilli
a. aerobic
b. anaerobic
c. aerobic,non-sporulating
d. aerobic,Gram-negative,non-sporulating
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Answer: (d).aerobic,Gram-negative,non-sporulating

5. Which of the following organism does not belong to coliform group of bacteria?
a. Salmonella
b. Serratia
c. Enterobacter
d. Proteus
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Answer: (c).Enterobacter

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