Top 250+ Solved Water and Wastewater Engineering MCQ Questions Answer
Q. In very first stage of decomposition of the organic matter in sewage
a. Nitrites are formed
b. Nitrates are formed
c. Carbondioxide is formed
d. Ammonia is formed
Q. The self-cleansing velocity of water flowing through pipe lines, is
a. 2 metres/sec
b. 1 metre/sec
c. 0.5 metre/sec
d. 0.25 metre/sec
Q. In case of sewer lines
a. Water test is carried out to check water tightness of the joints
b. Test for straightness is carried out with the help of a lamp and mirror
c. Obstruction test is carried out with the help of smooth ball of diameter 13 mm
d. All the above
Q. The normal values of over flow rates for secondary sedimentation tanks, ranges between
a. 25,000 to 35,000 litres/sqm/day
b. 40,000 to 50,000 litres/sqm/day
c. 50,000 to 60,000 litres/sqm/day
d. 80,000 to 10,000 litres/sqm/day
Q. A manhole is classified as shallow if its depth is between
a. 0.4 to 0.5 m
b. 0.5 to 0.7 m
c. 0.7 to 0.9 m
d. 0.9 to 1.20 m
Q. The first stage of neutral process of sludge digestion, is
a. Acid fermentation
b. Acid regression
c. Alkaline fermentation
d. None of these
Q. In sewers the highest non-scouring velocity is achieved in
a. Glazed bricks sewers
b. Cast iron sewers
c. Cement concrete sewers
d. Stone ware sewers
Q. When the reduced level of the water source is higher than the reduced level of the consumer'splace, water is generally supplied
a. By pumping system
b. By gravitational system
c. Both (a) and (b)
d. All the above
Q. Surcharge storage zone of a reservoir, is
a. Below dead storage (B) (C) (D)
b. Between dead storage and useful storage
c. Above useful storage
d. Also known as valley storage
Q. In pressure supply mains, water hammer pressure is reduced by providing
a. Sluice valves
b. Air valves
c. Pressure relief valves
d. None of these
Q. Specific capacity or yield of wells, is generally expressed, as
a. m 3 per sec
b. m 3 /hour
c. m 3 /hour/m2
d. m 3 /hour/m2 /m
Q. Turbidity of raw water is a measure of
a. Suspended solids
b. Acidity of water
c. B.O.D.
d. None of these
Q. If the chosen diameter of a pipe, is less than the economical diameter
a. Cost of pipe will be less
b. Head loss will be high
c. Cost of pumping will be more than saving
d. All the above
Q. While determining the yield of open wells by the pumping test
a. Velocity of recharging water, increases with depression head
b. Depression head resulting at critical velocity, is called critical depression head
c. Working head is generally limited to 1/3 rd of the critical depression head
d. Maximum safe yield of an open well, is expected at critical depression head