Top 250+ Solved Water and Wastewater Engineering MCQ Questions Answer
Q. Critical time for developing a water hammer, is the time required for
a. Closing the valve
b. The wave to travel from valve to the reservoir
c. The wave to travel from the valve to the reservoir and back
d. None of these
Q. Bacterias which can survive with or without free oxygen, are known
a. Aerobic bacterias
b. Anaerobic bacterias
c. Facultative bacterias
d. None of these
Q. The standard B.O.D. at 20°C, is taken for the consumption in
a. 2 days
b. 3 days
c. 4 days
d. 5 days
Q. Distribution of wash water is provided in
a. Sedimentation tank
b. Slow sand filter
c. Rapid gravity filter
d. All the above
Q. If P is population of a city in thousands and Q is fire demand in litres per minute, for properestimate of water, the Empirical formula Q = 1135 [(P/5) + 10] is suggested by
a. National Board of fire under-writers
b. Freeman
c. Kuichling
d. None of these
Q. During treatment of water, sedimentation is done
a. Before filtration
b. After filtration
c. Simultaneously with filtration
d. Along with chlorination
Q. The ratio of the maximum daily consumption to the average daily demand, is
a. 1.0
b. 1.2
c. 1.4
d. 1.8
Q. From the surface of reservoir, evaporation may be minimized by sprinkling
a. Spirit
b. Hydrochloric acid
c. Acetyl alcohol
d. Methane
Q. The transitional middle portion of a logistic curve follows
a. A geometric growth
b. A logarithmic growth
c. A first over curve
d. A constant rate
Q. For plain chlorination of water, the quantity of chlorine used, is
a. 0.1 mg/litre
b. 0.2 mg/litre
c. 0.3 mg/litre
d. 0.5 mg/litre
Q. In distribution pipes, air valves are provided at
a. Lower points
b. Junction points
c. Higher points
d. Anywhere
Q. Manholes along the mains from the source to a city are provided at 500 m intervals in
a. Steel pipes
b. R.C.C. pipes
c. Hume steel pipes
d. All the above
Q. The maximum permissible colour for domestic supplies based on cobalt scale, is
a. 5 ppm
b. 10 ppm
c. 15 ppm
d. 20 ppm
Q. Increase in population of a rapidly growing city, may be estimated by
a. Arithmetical mean method
b. Geometrical method
c. Incremental increase method
d. Graphical comparison method
Q. Per capita demand of water is calculated in litres
a. Per person per day
b. Per person per month
c. Per person per year
d. None of these