Top 250+ Solved Water and Wastewater Engineering MCQ Questions Answer
Q. Hard water for public water supply is discarded because
a. ) It consumes more soap
b. It contains lot of turbidity
c. It contains pathogenic bacterias
d. It possesses bad taste and odour
Q. Pick up the incorrect statement from the following:
a. Iron salts produce heavy flocks and hence remove more suspended matter
b. Iron salts remove hydrogen sulphides
c. Iron salts can be used over a limited range of pH values
d. Iron salts impart corrosiveness to water
Q. Asbestos pipes are
a. Light in weight and easy to transport
b. Highly resistant to corrosion
c. High flexible to accommodate deflection upto 12°
d. All the above
Q. A strainer type well sunk through three previous layers intervened by three imperviousaquicludes, draws water from
a. Top most pervious layer
b. Central pervious layer
c. Lowest pervious layer
d. All the pervious layers
Q. Runoff is the quantity of water which flows
a. In sewer pipes
b. Due to leakage in pipes
c. In rivers
d. None of these
Q. At the junction of sewers
a. Top of smaller sewer is kept lower
b. Top of larger sewer is kept lower
c. Tops of both the sewers are at the same level
d. None of these
Q. The sewage treatment units in which anaerobic decomposition of organic matter is used, arecalled
a. Imhoff tanks
b. Trickling filters
c. Sludge sedimentation tanks
d. None of these
Q. The sewer which received discharge from two or more main sewers, is known as
a. A trunk sewer
b. An outfall sewer
c. A main sewer
d. An intercepting sewer
Q. The grit and silt of the grit chambers, may not be used for
a. Raising low lying areas by dumping
b. Concreting
c. Both (a) and (b)
d. Neither (a) nor (b)
Q. For treating the sewage of a large city, you will recommend
a. A sedimentation tank and an activated sludge treatment plant
b. A plant consisting of Imhoff tanks with low rate trickling filters
c. Sedimentation tanks with high rate trickling filters
d. None of these
Q. Imhoff cone is used to measure
a. Total organic solids
b. Total solids
c. Total in organic solids
d. Settleable solids
Q. 1000 kg of sewage contains
a. 0.112 kg in suspension
b. 0.112 kg in solution
c. 0.225 kg in solution
d. Both (a) and (c) of above
Q. For the COD test of sewage, organic matter is oxidised by K2 Cr2O7 in the presence of
a. H2SO4
b. HNO3
c. HCl
d. None of these
Q. The sludge does not contain waste water from
a. Bath rooms
b. Wash basins
c. Kitchen sinks
d. Toilets
Q. In sewers the velocity of flow should not be
a. More than the self-cleansing velocity
b. Less than the self-cleansing velocity
c. Less than 10 m/sec
d. More than 20 m/sec