Engineering :: Environmental Engineering
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11. |
In case of public supplies, the maximum permissible nitrite content is |
A. |
250 ppm |
B. |
200 ppm |
C. |
100 ppm |
D. |
50 ppm |
E. |
zero ppm |
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Answer: Option E
Explanation:
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12. |
The chloride content in the water for public supplies should not exceed |
A. |
250 mg/litre |
B. |
100 mg/litre |
C. |
50 mg/litre |
D. |
20 mg/litre |
E. |
1 mg/litre |
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Answer: Option A
Explanation:
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13. |
The flouride content in the drinking water should not exceed |
A. |
200 mg/litre |
B. |
150 mg/litre |
C. |
100 mg/litre50 mg/litre |
D. |
50 mg/litre |
E. |
1 mg/litre |
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Answer: Option E
Explanation:
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14. |
The total count of bacteria in portable water should not exceed |
A. |
10,000 per c.c. |
B. |
5000 per c.c. |
C. |
998 per c.c. |
D. |
10 per c.c. |
Answer: Option D
Explanation:
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15. |
In one litre sample of drinking water the coliform organism should not exceed |
Answer: Option D
Explanation:
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16. |
Turbidity in water is due to |
A. |
Algae |
B. |
Fungi |
C. |
Organic salts |
D. |
Finely divided particles of clay, silt and organic matter |
E. |
None of the above |
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Answer: Option D
Explanation:
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17. |
The main disadvantage of hard water is |
A. |
Higher density |
B. |
More turbidity |
C. |
Foul smell |
D. |
Bad taste |
E. |
Increased soap consumption |
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Answer: Option E
Explanation:
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18. |
Plants that grow in absence of sublight in water, are called |
A. |
Algae |
B. |
Shrubs |
C. |
Fungi |
D. |
Any of the above |
E. |
All of the above |
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Answer: Option C
Explanation:
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19. |
The becteria that can survive without oxygen is called |
A. |
Facultative bacteria |
B. |
Anerobic bacteria |
C. |
Aerobic bacteria |
D. |
Furobic bacteria |
E. |
All of the above |
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Answer: Option A
Explanation:
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20. |
The presence of which of the following material in water is not considered to be dangerous? |
Answer: Option D
Explanation:
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