A. Nitrites are formed

B. Nitrates are formed

D. Carbondioxide is formed

A. Dysentery

B. Typhoid

C. Cholera

A. 60

B. 40

D. 100

A. Purification

C. Irrigation

D. Oxidation

B. 3 to 5 mm

C. 8 to 10 mm

D. 5 to 8 mm

A. 2-Jan

B. 4-Jan

C. 4-Mar

A. Oxygen

B. Nitrogen

C. Hydrogen

B. None of these

C. Reciprocating pump

D. Pneumatic ejector

B. Cleaner water

C. Active decomposition

D. Recovery

A. Change of gradient

B. Junction

D. Bend

A. Must be of adequate size to avoid over flow

B. Must flow under gravity to full

C. Must be laid at least 2 to 3 m deep to collect /water from the basements

A. Lower end of ventilating column

B. Upper end of the manhole

C. First step in manhole

A. Silting occurs at bottom

B. Scouring occurs at bottom

C. Both silting and scouring occur at bottom

B. Parabolic shaped

C. Egg shaped

D. Circular shaped

B. Branch sewers

C. Trunk sewers

D. Main sewers

A. Depth of 0.9 m to 1.20 m is kept

C. Flow velocity 0.15 m to 0.3 m/sec is kept

D. One minute of detention period is kept

A. Near the inner surface of the pipe

B. Near the outer surface of the pipe

C. Both A. and B.

B. Sag pipe

C. Depressed sewer

D. Inverted syphon

B. Cane rodding

C. None of these

D. Wooden pills

A. Parabolic

B. Rectangular

D. New egged

A. The sewers may be carried up and down the hills and valleys

C. The sewer pipes are generally laid along level hills

D. The water supply pipes get clogged if flow velocity is less than self cleansing velocity

A. Carbon dioxide

B. Nitrates

D. Sulphates

B. Nitric acid

C. Hydrochloric acid

D. Citric acid

A. At the beginning of sewer line

B. On manholes

D. At the end of septic tanks

A. 1

B. 1

C. (1

A. Storm sewage

B. Surface water

C. Ground water

A. Combined system

C. Partially separate system

D. None of these

B. Is trebled

C. Is only provided

D. Is not enough

A. Rectangular

B. New egged

C. Parabolic

A. Sludge is activated by constant stirring

B. Aeration is continued till stability

D. Water is removed by centrifugal action

A. 0.5 metre/sec

B. 1 metre/sec

D. 0.25 metre/sec

A. 10 days

B. 20 days

C. 60 days

A. 0.4 to 0.5 m

C. 0.9 to 1.20 m

D. 0.5 to 0.7 m

A. 5 kg to 7.5 kg

C. 1 kg to 2.0 kg

D. 7.5 kg to 10 kg

A. [(100 P1)/(100 + P2)] V1

B. [(100 + P1)/(100 P2)] V1

D. [(100 + P2)/(100 P1)] V1

A. Less than the rate of water supply

C. Equal to the rate of water supply

D. More than the rate of water supply

A. The change of direction

B. The junctions of sewers

D. The change of gradient

A. 75 m

B. 30 m

D. 20 m

A. Low discharge

B. Greasy and oily matters

D. Silting

A. Magnetic compass

B. Clinometer

D. Theodolite

A. Overflow velocity

B. Overflow rate

C. Surface loading

B. 3 hours

C. 2 hours

D. 5 hours

A. 50 m to 100 m

B. 100 m to 150 m

C. 25 to 50 m

A. 40,000 to 50,000 litres/sqm/day

C. 80,000 to 10,000 litres/sqm/day

D. 50,000 to 60,000 litres/sqm/day

A. Carbonaceous demand

B. First stage demand

C. Initial demand

B. 80 cm

C. 50 cm

D. 90 cm

A. 25,000 to 35,000 litres/sqm/day

B. 80,000 to 100,000 litres/sqm/day

C. 50,000 to 60,000 litres/sqm/day

B. Circular shaped

C. Standard egg shaped

D. Parabolic shaped

A. 2 days

C. 1 day

D. 3 days

B. 5

C. 10

D. 15