Engineering :: Environmental Engineering
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51. |
Bleaching power is |
A. |
Lime |
B. |
Stacked lime |
C. |
Chloride of lime |
D. |
Hypo-chloride of lime |
E. |
Hypo-chlorite of lime |
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Answer: Option E
Explanation:
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52. |
The process used for the removal of dissolved carbondioxide from the water, is known as |
A. |
Coagulation |
B. |
Agitation |
C. |
Aeration |
D. |
Sedimentation |
E. |
Zeolitc |
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Answer: Option C
Explanation:
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53. |
Ultra-violet rays are used for the treatment of water known as |
A. |
Dechlorination |
B. |
Disinfection |
C. |
Aeration |
D. |
Filtration |
E. |
Bleaching |
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Answer: Option B
Explanation:
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54. |
The method used for the removal of fine suspended particle is |
A. |
Filtration |
B. |
Agitation |
C. |
Flotation |
D. |
Aeration |
E. |
Screening |
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Answer: Option A
Explanation:
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55. |
Turbidity in water may be removed by |
A. |
Sedimentation |
B. |
Filtration |
C. |
Agitation |
D. |
Aeration |
E. |
Oxidation |
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Answer: Option A
Explanation:
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56. |
The permissible level of HCN in drinking water is |
A. |
Less than 0.01 mg/litre |
B. |
Around 1 mg/litre |
C. |
Around 5 mg/litre |
D. |
Between 10 to 20 mg/litre |
E. |
More than 50 mg/litre |
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Answer: Option A
Explanation:
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57. |
The presence of fluorides in drinking water helps in |
A. |
Purification of water |
B. |
Preventing decaying of teeth |
C. |
Deodourisation of water |
D. |
Reduces fungi formation |
E. |
Killing aerobic bacteria |
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Answer: Option B
Explanation:
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58. |
The maximum concentration of lead in drinking water should not exceed. |
A. |
0.0005 mg/litre |
B. |
0.005 mg/litre |
C. |
0.05 mg/litre |
D. |
0.5 mg/litre |
E. |
5 mg/litre |
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Answer: Option C
Explanation:
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59. |
Which of the following is pesticide? |
A. |
Endrin |
B. |
Aldrin |
C. |
Toxaphone |
D. |
DDT |
E. |
All of the above |
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Answer: Option E
Explanation:
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60. |
The maximum permissible level or pesticides, in general, in drinking water is nearly |
A. |
1 to 50 ppm |
B. |
50 to 100 ppm |
C. |
100 to 250 ppm |
D. |
250 to 500 ppm |
E. |
500 to 1000 ppm |
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Answer: Option A
Explanation:
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