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Home » Engineering » Civil Engineering » Aptitude Test - 15
1.The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
A. Reflux valve
B. Sluice valve
C. Air relief valve
D. Reflux valve
2. The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is
A. Separate system
B. Combined system
C. Partially separate system
D. Separate system
3. The main disadvantage of cement concrete sewers is
A. Less strength
B. Difficulty in construction
C. Difficulty in transportation due to heavy weight
D. Less strength
4.Settling velocity increases with
A. Specific gravity of solid particles
B. Size of particles
C. Depth of tank
D. Specific gravity of solid particles
5.. Facultative bacteria are able to work in
A. Presence of oxygen only
B. Absence of oxygen only
C. Presence as well as in absence of oxygen
D. Presence of oxygen only
6.The suitable layout of distribution system for a city with roads of rectangular pattern is
A. Grid iron system
B. Dead end system
C. Ring system
D. Grid iron system
7.The slope of sewer shall be
A. Given in the direction of natural slope of ground
B. Given in the direction opposite to natural slope of ground
C. Zero
D. Given in the direction of natural slope of ground
8. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
A. TOD > BOD > COD
B. TOD > COD > BOD
C. BOD > COD > TOD
D. TOD > BOD > COD
9. The working conditions in imhoff tanks are
A. Aerobic only
B. Anaerobic only
C. Aerobic in lower compartment and anaerobic in upper compartment
D. Aerobic only
10. The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called
A. Waste pipe
B. Soil pipe
C. Vent pipe
D. Waste pipe
11.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
12.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
13. 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
14.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
15. 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
16. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
A. 0°C
B. 15°C
C. 20°C
D. 0°C
17.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
18. 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
19.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 %
20.In a sludge tank, the gas mainly produced, is
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Oxygen
21.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
22.Stoneware sewers are available in size
A. 10 cm
B. 15 cm
C. 20 cm
D. 10 cm
23.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
24. In normal conditions, the period for sludge digestion, is
A. 10 days
B. 20 days
C. 30 days
D. 10 days
25.For evaporation and measurement of settable solids, the apparatus used, is
A. A jar
B. A breaker
C. A test tube
D. A jar
26. 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%
27.The gas which may cause explosion in sewers, is
A. Carbondioxide
B. Methane
C. Ammonia
D. Carbondioxide
28.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
29.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
30. 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
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