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Civil Engineering Objective Questions { Environmental Engineering }



225. In 1000 kg of sewage, the total solids approximate
A. 0.5 to 1.0 kg
B. 1 kg to 2.0 kg
C. 5 kg to 7.5 kg
D.. 7.5 kg to 10 kg.
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226. Imhoff cone is used to measure
A. total organic solids
B. total solids
C. total in organic solids
D. settleable solids.
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227. The pH value of fresh sewage is usually
A. equal to 7
B. more than 7
C. less than 7
D. equal to zero.
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228.  For the survival offish in a river stream, the minimum dissolved oxygen is prescribed
A. 3 PPm
B. 4 PPm
C. 5 PPm
D. 10 ppm.
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229.  5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
A. 0?C
B. 15?C
C. 20?C
D. 25?C.
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230.  Kjedahl nitrogen is a mixture of
A. ammonia and nitrogen
B. nitrogen and organic nitrogen
C. organic nitrogen and ammonia
D.--a11 the above.
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231.  Pick up the correct statement from the following :
A. In treated sewage, 4 PPm of D.O. is essential
B. Only very fresh sewage contains some dissolved oxygen
C. The-solubility of oxygen in sewage is 95% that is in distilled water
D. All the above.
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