Engineering :: Public Health Engineering
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| 191. |
The process of removing excess chlorine from water is called |
| A. |
plain chlorination |
B. |
post-chlorination |
| C. |
dechlorination |
D. |
super-chlorination |
Answer: Option C
Explanation:
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| 192. |
The process of dechlorination is followed by |
| A. |
pre-chlorination |
B. |
post cholorination |
| C. |
super chlorination |
D. |
double chlorination |
Answer: Option C
Explanation:
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| 193. |
The amount of chlorine used for plain chlorination of water is about |
| A. |
0.2 ppm |
B. |
0.3 ppm |
| C. |
0.4 ppm |
D. |
0.5 ppm |
Answer: Option D
Explanation:
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| 194. |
When chlorine is added to raw water at more than one point, the process is termed as break point chlorination. |
Answer: Option B
Explanation:
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| 195. |
The most commonly used chemical for dechlorination of water is |
| A. |
sodium thiosulphate |
B. |
sodium sulphite |
| C. |
potassium permaganate |
D. |
all of these |
Answer: Option D
Explanation:
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| 196. |
In orthotolodine test, safe residual for drinking water is indicated by |
| A. |
yellow colour |
B. |
green colour |
| C. |
lemon yellow colour |
D. |
none of these |
Answer: Option A
Explanation:
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| 197. |
Bleaching powder is |
| A. |
slaked lime |
B. |
chloride of lime |
| C. |
hypo-chloride of lime |
D. |
hypo-chlorite of lime |
Answer: Option D
Explanation:
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| 198. |
The percentage of chlorine in fresh bleaching powder is |
| A. |
20 to 25% |
B. |
25 to 30% |
| C. |
30 to 35% |
D. |
35 to 40% |
Answer: Option C
Explanation:
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| 199. |
The temporary hardness in water is cused due to the salts like |
| A. |
chlorides |
B. |
nitrates |
| C. |
carbonates |
D. |
sulphates |
Answer: Option C
Explanation:
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| 200. |
The permanent hardness in water is caused due to the salts like |
| A. |
chlorides |
B. |
nitrates |
| C. |
sulphates |
D. |
all of these |
Answer: Option D
Explanation:
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