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Environmental Engineering - Interview Questions and Answers

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71. The amount of coagulant needed for coagulation of water increases with i) increase in turbidity of water ii) decrease in turbidity of water iii) increase in temperature of water iv) decrease in temperature of water The correct answer is
A. (i) and (ii)
B. (i)and(iv)
C. (ii) and (iii)
D. (ii) and (iv)
Explanation:
72. In water treatment, rapid gravity filters are adopted to remove
A. dissolved organic substances
B. dissolved solids and dissolved gases
C. floating solids and dissolved inorganic solids
D. bacteria and colloidal solids
Explanation:
73. The settling velocity of a particle in a sedimentation tank increases if
A. particle size is decreased
B. the surface area of tank is increased
C. the depth of tank is decreased
D. none of the above
Explanation:
74. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
A. 10 to 25
B. 50
C. 75
D. 100
Explanation:
75. The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of
A. 1 mg/litre
B. 10 mg/litre
C. 100 mg/litre
D. 1000 mg/litre
Explanation:
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