Top 250+ Solved Water and Wastewater Engineering MCQ Questions Answer
Q. Which one of the following part of human body withstands minimum radiation?
a. Thyroid
b. Kidneys
c. Eyes
d. Ovaries/testis
Q. Drop manholes are the manholes
a. Without entry ladders
b. Without manhole covers
c. With depths more than 3.5 m
d. Having drains at different levels
Q. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
a. 1 in 5
b. 1 in 10
c. 1 in 15
d. 1 in 20
Q. Primary treatment of sewage consists of removal of
a. Large suspended organic solids
b. Oil and grease
c. Sand and girt
d. Floating materials
Q. Cement concrete sewers are only suitable if non-scouring velocity is between
a. ) 2.5 to 3.0 m/sec (B) (C) (D)
b. 3.0 to 4.0 m/sec
c. 3.5 to 4.5 m/sec
d. 4.5 to 5.5 m/sec
Q. The most widely used pump for lifting sewage is
a. Centrifugal pump
b. Reciprocating pump
c. Pneumatic ejector
d. Air pressure pump
Q. The detention time of a circular tank of diameter d and water depth H, for receiving the sewageQ per hour, is
a. d² (0.011d + 0.785H)/Q
b. d (0.022d + 0.085H)/Q
c. d (0.785d + 0.011H)/Q
d. d (0.285d + 0.011H)/Q
Q. Lead acetate test in sewer manhole is done to test the presence of
a. Methane gas (B) (C) (D)
b. Hydrogen sulphide
c. Carbondioxide gas
d. Diesel vapours
Q. Anti syphonage pipe is fitted
a. At the end of septic tanks (B) (C) (D)
b. On manholes
c. With a W.C. trap
d. At the beginning of sewer line
Q. In a grit chamber of a sewage treatment plant,
a. Flow velocity 0.15 m to 0.3 m/sec is kept
b. Depth of 0.9 m to 1.20 m is kept
c. One minute of detention period is kept
d. All the above
Q. The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
a. 1.5 (B) (C) (D)
b. 2.0
c. 3.0
d. 4.0
Q. pH value of sludge during alkaline regression stage, is
a. More than 7
b. Less than 7
c. Less than 6
d. More than 6
Q. The arrangement made for passing the sewer line below an obstruction below the hydraulicgradient lines called
a. Inverted syphon
b. Depressed sewer
c. Sag pipe
d. all of these
Q. Pick up the incorrect size of stone ware sewers
a. 52.5 cm (B) (C) (D)
b. 67.5 cm
c. 82.5 cm
d. None of these