A. 3-Jan

B. 0/2

D. 0/3

A. Highly resistant to sulphide corrosion

C. Highly impervious

D. Hydraulically efficient because of their smooth interior surface

A. None of these

B. A sewer drops from a height

C. A lamp is inserted to check obstruction

A. 25%

C. 5%

D. 10%

A. Kutter

B. William-Hazen

D. Bazin

B. 100 m

C. 50 m

D. 200 m

A. From low lying areas

B. From flat areas

D. From basements

A. Chezys formula

B. Kutters formula

D. Mannings formula

A. Comminutor

B. Shredder

D. Neither A. nor B.

A. The presence of oxygen

B. The absence of oxygen

D. Neither A. nor B.

B. It is cheaper in construction

C. It provides maximum area for a given perimeter

D. It provides maximum hydraulic mean depth

A. Weight

C. Size

D. Shape

B. Carbondioxide gas

C. Petrol vapours

D. Hydrogen sulphide gas

B. Organic and inorganic materials are separated

C. Detention period is kept 3 to 4 minutes

D. Flow velocity is kept 0.09 m/sec

A. Pneumatic ejector

B. Reciprocating pump

C. Air pressure pump

A. 50 ppm

B. 150 ppm

D. 100 ppm

B. Carbondioxide

C. Oxygen

D. Nitrogen

A. 300 mg/l

C. 200 mg/l

D. 100 mg/l

A. None of these

B. Free ammonia

C. Nitrites

A. City

C. Any point

D. Out-fall

A. Are used for carrying sewage and drainage from houses

C. After casting are dried and burnt at temperature 150C, 700C and 1200C

D. Are manufactured from clays and shale

A. Bending force

B. Shearing force

D. Tensile force

B. 20 mm

C. 40 mm

D. 30 mm

A. Diesel vapours

C. Carbondioxide gas

D. Methane gas

B. 3.5 m

C. 4.5 m

D. 4 m

A. 1.085

C. 1.075

D. 1.065

A. Dissolved oxygen in water

C. Hydrology

D. Temperature

A. 1000

C. 100

D. 5000

A. Minimum flow

B. Maximum flow

D. None of these

A. 25 cm

C. 10 cm

D. 20 cm

A. 6.5 m

C. 5 m

D. 5.5 m

A. /2

B. D

D. /4

A. Total organic solids

C. Total solids

D. Total in organic solids

A. Q/(B D)

C. Q/(L D)

D. Q/L

A. Raising low lying areas by dumping

C. Both A. and B.

D. Neither A. nor B

A. HCl

C. HNO3

D. None of these

B. Main sewer

C. Branch sewer

D. House sewer

A. Hydrogen sulphide

C. Oxygen

D. Methane

B. Inlets are provided on the road surface at the lowest point for draining rain water

C. Inlets having horizontal openings, are called horizontal inlets

D. Inlets are generally provided at an interval of 30 m to 60 m along straight roads

A. Unexpected increase in the population

B. Unexpected large scale infiltration of stream water

D. Under estimates of maximum and average flows

A. A heap

B. Windrow

C. Plateau

B. Every change in the size of sewers

C. Upper ends of branch sewers

D. Distances 150 m to 300 m

A. 30 m

B. 20 m

D. 16 m

A. The circular section of sewers provides maximum hydraulic mean depth

B. The circular sewers work efficiently if the sections run at least half full

C. The circular sewers are provided for separate sewerage system

A. pH value indicates acidity and alkalinity of sewage

B. In acidic sewage, the pH value is less than 7

C. In alkaline sewage, the pH value is more than 7

A. Chemical Oxygen Demand (C.O.D.)

C. None of these

D. Bio-Chemical Oxygen Demand (B.O.D.)

A. Horizontal side

C. All sides

D. Top side

A. Aerobic bacteria flourish in the presence of oxygen

B. Anaerobic bacteria flourish in the absence of oxygen

C. Facultative bacteria flourish with or without oxygen

B. The black colour indicates septic sewage

C. The sewage omits offensive odours after four hours

D. Turbidity is more in strong sewage

A. When diluting water has high dissolved oxygen content

C. When the diluting water is having flow currents

D. When sewage is fresh