Engineering :: Environmental Engineering
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21. |
Lead poisoning occurs when the lead content in water is |
A. |
300 - 500 ppm |
B. |
30 - 50 ppm |
C. |
10 - 15 ppm |
D. |
3 - 5 ppm |
E. |
0.3 - 0.5 ppm |
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Answer: Option E
Explanation:
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22. |
Water with least contamination can be be obtained from |
A. |
Rivers |
B. |
Lakes |
C. |
Wells |
D. |
Reservoirs |
E. |
Spring along the hill slope |
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Answer: Option E
Explanation:
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23. |
A hard water may contain |
A. |
Calcium carbonate |
B. |
Magnesium sulphate |
C. |
Magnesium bicarbonate |
D. |
Any of the above |
E. |
None of the above |
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Answer: Option D
Explanation:
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24. |
Per capita consumption of water is usually taken as |
A. |
50 - 100 litres |
B. |
150 - 300 litres |
C. |
400 - 500 litres |
D. |
500 - 750 litres |
E. |
750 - 1000 litres |
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Answer: Option B
Explanation:
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25. |
Which of the following industry will usually have the highest concumption of water for processing? |
A. |
Foundry |
B. |
Steel plant |
C. |
Automobile industry |
D. |
Paper mill |
E. |
Aluminium industry |
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Answer: Option D
Explanation:
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26. |
The process of removal of permanent hardness of water is |
A. |
Zeolite process |
B. |
Sedimentation process |
C. |
Filtration process |
D. |
Boiling process |
E. |
Lime process |
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Answer: Option A
Explanation:
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27. |
The odour of water is expressed in terms of threshold number. The maximum threshold number permitted for public supplies is |
Answer: Option C
Explanation:
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28. |
For the maximum alkalinity of water, the pH value would be |
Answer: Option D
Explanation:
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29. |
For the maximum acidity of water, pH value would be |
Answer: Option A
Explanation:
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30. |
If with minimum quantity of potassium permanganate, the pink colour of water disappears soon, then it shows that |
A. |
Water is hard |
B. |
Water is acidic |
C. |
Water is alkaline |
D. |
Organic matter is present in water |
E. |
Chlorine content is high in water |
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Answer: Option D
Explanation:
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