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Hassan
1.If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
A. Total alkalinity
B. Total hardness
C. Total hardness total alkalinity
D. Total alkalinity
2.For a given discharge, the efficiency of sedimentation tank can be increased by
A. Increasing the depth of tank
B. Decreasing the depth of tank
C. Increasing the surface area of tank
D. Increasing the depth of tank
3. Air binding phenomena in rapid sand filters occur due to
A. Excessive negative head
B. Mud ball formation
C. Higher turbidity in the effluent
D. Excessive negative head
4.In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is
A. Separate system
B. Combined system
C. Partially combined system
D. Separate system
5. Self-cleansing velocity is
A. Velocity at dry weather flow
B. Velocity of water at flushing
C. Velocity at which no accumulation remains in the drains
D. Velocity at dry weather flow
6. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
A. 0°C
B. 15°C
C. 20°C
D. 0°C
7.Pick up the correct statement from the following:
A. Inlets are provided on the road surface at the lowest point for draining rain water
B. Inlets are generally provided at an interval of 30 m to 60 m along straight roads
C. Inlets having horizontal openings, are called horizontal inlets
D. Inlets are provided on the road surface at the lowest point for draining rain water
8. Pick up the incorrect statement from the following:
A. Manholes are provided in sewer pipes at suitable intervals
B. Catch basins are generally provided in sewers for carrying drainage discharge
C. Inlets are generally provided in all sewers
D. Manholes are provided in sewer pipes at suitable intervals
9.The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
A. 25 %
B. 50 %
C. 10 %
D. 25 %
10.In a sludge tank, the gas mainly produced, is
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Oxygen
11.Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to
A. Initial demand
B. First stage demand
C. Carbonaceous demand
D. Initial demand
12.Stoneware sewers are available in size
A. 10 cm
B. 15 cm
C. 20 cm
D. 10 cm
13.If ‘D’ is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
A. 1.250 D
B. 1.350 D
C. 1.425 D
D. 1.250 D
14. In normal conditions, the period for sludge digestion, is
A. 10 days
B. 20 days
C. 30 days
D. 10 days
15.For evaporation and measurement of settable solids, the apparatus used, is
A. A jar
B. A breaker
C. A test tube
D. A jar
16. In trickling filter, B.O.D. is reduced to
A. 30 to 40%
B. 40 to 60%
C. 60 to 80%
D. 30 to 40%
17.The gas which may cause explosion in sewers, is
A. Carbondioxide
B. Methane
C. Ammonia
D. Carbondioxide
18.Pick up the correct statement from the following:
A. The water supply pipes carry pure water free from solid particles
B. The water supply pipes get clogged if flow velocity is less than self cleansing velocity
C. The sewers may be carried up and down the hills and valleys
D. The water supply pipes carry pure water free from solid particles
19.Pick up the incorrect statement from the following:
A. The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion
B. Sludge digestion is carried out in sludge tank
C. The gases produced in sludge digestion process, contain 75% carbon dioxide
D. The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion
20. The sewer pipes
A. Carry sewage as gravity conduits
B. Are designed for generating self-cleansing velocities at different discharge
C. Should resist the wear and tear caused due to abrasion
D. Carry sewage as gravity conduits
21.The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is
A. 30 minutes
B. 1 hour
C. 1 hour and 30 minutes
D. 30 minutes
22. The Chezy's constant C in the formula V = C √rs depends upon
A. Size of the sewer
B. Shape of the sewer
C. Roughness of sewer surface
D. Size of the sewer
23. The discharge per unit plan area of a sedimentation tank, is generally called
A. Over flow rate
B. Surface loading
C. Over flow velocity
D. Over flow rate
24. Pick up the incorrect statement from the following for allowing workers to enter sewers
A. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
B. Proper tests for the presence of poisonous gases must be carried out
C. The men entering the manhole should be advised to smoke in the sewer
D. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
25.Waste removal system was established in which of the following cities for the first time?
A. Athens
B. Lahore
C. Paris
D. Athens
26. Which of the following solid wastes describes the term ‘Municipal Solid Waste’?
A. Toxic
B. Hazardous
C. Non-toxic
D. Toxic
27.Why is it difficult to recycle plastics?
A. It is very hard
B. It comes in different sizes
C. It is adhesive
D. It is very hard
28. Which of the following is done on an individual level?
A. Burning
B. Disposal
C. Recycling
D. Burning
29.Why is recycled paper banned for use in food containers?
A. Because it creates a lot of spaces
B. Because it creates contamination
C. Because paper can be used only one time
D. Because it creates a lot of spaces
30.Which of the following plans is used as a waste management plan?
A. Plan for reuse
B. The integrated plan
C. Plan for recycling
D. Plan for reuse
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