Waste Water Engineering MCQs
Waste Water Engineering MCQs
Our experts have gathered these Waste Water Engineering MCQs through research, and we hope that you will be able to see how much knowledge base you have for the subject of Waste Water Engineering by answering these multiple-choice questions.
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1: Pick up the correct statement from the following:
A. The solubility of oxygen in sewage is 95% that is in distilled water
B. In treated sewage, 4 PPm of D.O. is essential
C. Only very fresh sewage contains some dissolved oxygen
D. All these
2: For evaporation and measurement of settlable solids, the apparatus used, is
A. A breaker
B. A test tube
C. A jar
D. An Imhoff cone
3: If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is
A. D
B. 1.5 D
C. 1.75 D
D. 1.25 D
4: Clogging of sewers, is caused due to
A. Silting
B. Greasy and oily matters
C. Low discharge
D. Domestic wastes thrown in manholes
E. All these
5: The coagulant widely used for sewage treatment, is
A. Chlorinated copperas
B. Alum
C. Ferric sulphate
D. Ferric chloride
6: Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to
A. Carbonaceous demand
B. First stage demand
C. Initial demand
D. All of these.
7: A rain sanitary sewer is constructed to carry
A. Storm sewage
B. All these
C. Ground water
D. Sanitary sewage
E. surface water
8: In olden days the type of section adopted in trunk and out fall sewers was
A. Horse shoe shaped
B. Egg shaped
C. Parabolic shaped
D. Circular shaped
9: For house drainage minimum gradient is
A. 1 in 60
B. 1 in 400
C. 1 in 10
D. 1 in 80
10: House connections to the laterals is generally made by
A. P.C.C.
B. Cast iron
C. Glazed stonewares
D. R.C.C.
11: What the house drainage minimum gradient is
A. 1 in 80
B. 1 in 60
C. 1 in 400
D. 1 in 10
12: If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is
A. 3 hours
B. 5 hours
C. 2 hours
D. 4 hours
13: If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
A. None of these.
B. 1 in 120
C. 1 in 60
D. 1 in 100
14: If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section
A. 1.5 D
B. 1.25 D
C. D
D. 1.75 D
15: The asbestos cement pipes are generally laid
A. Vertically
B. At an angle of 30°
C. At an angle of 60°
D. Horizontally
16: In SI units the power of sound is represented in
A. Joules
B. Watts.
C. Kgs
D. Neutons
17: The screens are fixed
A. At an angle 30° to 60° to the direction of flow
B. Parallel to the direction of flow
C. Perpendicular to the direction of flow
D. None of these
18: If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is
A. 250 ppm
B. 225 ppm
C. 200 ppm
D. None of these
19: Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.
A. A is false but R is true.
B. Both A and R are true and R is the correct explanation of A
C. A is true but R is false
D. Both A and R are true but R is not a correct explanation of A
20: For treating the sewage of a large city, you will recommend
A. None of these
B. A plant consisting of Imhoff tanks with low rate trickling filters
C. Sedimentation tanks with high rate trickling filters
D. A sedimentation tank and an activated sludge treatment plant
21: When considering using graywater, you might use the water for ________.
A. Washing clothes.
B. Flushing toilets.
C. Washing hands.
D. Taking baths
22: What does "activated sludge" refer to?
A. A brownish flocculent culture of organisms
B. An oxygen-emitting device
C. A process used in wastewater treatment
D. A type of bacteria
23: What is the Activated Sludge Process used for?
A. Disposing of pollution in wastewaters
B. Treating industrial waste
C. Producing electrical power
D. Removing heavy metals from water
24: What does the process of aeration involve?
A. Boiling the liquid
B. Bringing about intimate contact between air and a liquid
C. Cooling the liquid
D. Mixing the liquid with oil
25: What is the purpose of an Aeration Tank?
A. To inject air into water
B. To absorb pollutants
C. To collect water
D. To process sewage
26: What do aerobic bacteria require for growth?
A. Free (elementary) oxygen
B. Nutrients
C. High temperatures
D. Dark conditions
27: ________ is are formed during primary wastewater treatment
A. Gray water
B. Sludge
C. Bacteria
D. Inorganic nutrients
E. Toxins
28: All of the following are examples of point sources of pollution except ________.
A. Oil spills , irrigation , fertilizers , pesticides
B. Pesticides , oil spills , irrigation , leaky underground storage tanks
C. Drainage from industrial plants , oil spills , runoff from street gutters , chemical spills
D. Pesticides , herbicides , animal waste , irrigation
29: Solids in wastewater treatment are removed in ________.
A. Pre-treatment
B. Primary treatment
C. Secondary treatment
D. Tertiary treatment
E. Sludge digestion
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