| 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
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| 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
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| 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
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| 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
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| 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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