Engineering :: Environmental Engineering
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31. |
The ratio activity of water due to Strontium can be removed by |
A. |
Aeration |
B. |
Alum coagulation |
C. |
Phosphate coagulation |
D. |
Lime |
E. |
Lime - Soda solution |
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Answer: Option C
Explanation:
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32. |
On board ships, the source of drinking water may be |
A. |
Rain water |
B. |
Sea water |
C. |
Desalted sea water |
D. |
Pumped deep sea water |
E. |
Any of the above |
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Answer: Option C
Explanation:
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33. |
Which organisms cause infections diseases? |
A. |
Viruses |
B. |
Worms |
C. |
Protozoa |
D. |
Fungi |
E. |
All of the above |
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Answer: Option E
Explanation:
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34. |
The water borne bacterial infections may cause |
A. |
Typhoid fever |
B. |
Dysentery |
C. |
Cholera |
D. |
Any of the above |
E. |
None of the above |
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Answer: Option D
Explanation:
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35. |
Mottling of teeth is associated with the presence of |
A. |
Chloride in water |
B. |
Calcium in water |
C. |
Sodium chloride in water |
D. |
Sulphur in water |
E. |
Fluorides in water |
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Answer: Option E
Explanation:
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36. |
The cycle of life, death and decay involving organic nitrogeneous matter is called |
A. |
The sulphur cycle |
B. |
The nitrogen cycle |
C. |
The carbon cycle |
D. |
The hydrological cycle |
E. |
None of the above |
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Answer: Option B
Explanation:
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37. |
The most frequent method of bacterial reproduction is by |
A. |
Cell division |
B. |
Sexual process |
C. |
Budding |
D. |
Colony formation |
E. |
The formation of spores |
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Answer: Option A
Explanation:
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38. |
Temporary hardness in water in caused by salts like |
A. |
Sulphates |
B. |
Nitrates |
C. |
Chlorides |
D. |
Carbonates |
E. |
All of the above |
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Answer: Option D
Explanation:
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39. |
Identify the incorrect statement if any Zeolite process is suitable for |
A. |
Removing temporary hardness |
B. |
Removing permanent hardness |
C. |
Cent percent removal of hardness |
D. |
Acidic waters |
E. |
When zeolite becomes inactive, it may be reactivated by flushing with brine solution |
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Answer: Option D
Explanation:
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40. |
Zeolite is |
A. |
A naturally occurring salt |
B. |
Hydread silica |
C. |
Silicon carbide |
D. |
Hydrated calcium silicate |
E. |
Hydrated alumino-silicate |
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Answer: Option E
Explanation:
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