Top 250+ Solved Water and Wastewater Engineering MCQ Questions Answer
Q. As per IS : 1172-1963, water required per head per day for average domestic purposes, is
a. 50 litres
b. 65 litres
c. 85 litres
d. 135 litres
Q. The duration of contact of chlorine with water before it is served to the first consumer, shouldbe at least
a. 10 to 15 minutes
b. 15 to 20 minutes
c. 20 to 30 minutes
d. 30 to 40 minutes
Q. Water supply system includes
a. Digging a well for water
b. Construction of dams
c. Construction of canals
d. Entire arrangement from source to distribution
Q. The maximum pressure to which a pipe is subjected to during its operation, is known
a. Working pressure
b. Design pressure
c. Test pressure
d. Pipe pressure
Q. For the same draw down in two observations wells at distances r1 and r2, the times after startof pumping are t1 and t2 hours respectively. The relation which holds good is
a. t2 = r2/r1 × t1
b. t2 = (r2/r1)² × t1
c. t2 = (r2/r1)3× t1
d. t2 = (r2/r1) × t12
Q. A slow sand filter is cleaned if its filter head is higher than
a. 10 cm to 20 cm
b. 20 cm to 40 cm
c. 40 cm to 70 cm
d. 70 cm to 120 cm
Q. The intake opening is generally covered by a screen to prevent entry of debris etc. and its levelis kept
a. At the level of water of the source
b. At the bottom of water of the source
c. At about 2.5 m above the bottom
d. None of these
Q. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams andduration of each fire is four hours, the total quantity of water required, is
a. 1880 kilo litres
b. 2880 kilo litres
c. 3880 kilo litres
d. 4880 kilo litres
Q. Steel pipe are
a. Suitable for withstanding high internal pressure
b. Connected by riveted or welded joints
c. Generally laid underground and no expansion joint is required
d. Likely to last 100 years under ordinary conditions
Q. When gravity and pumping systems of water distribution are adopted, the type of distributionreservoir, is
a. Elevated tank
b. Ground source reservoir
c. Intz tank
d. Stand pipe
Q. The force which develops in a pressure conduit supported on trestles, is
a. Tension
b. Compression
c. Temperature stress
d. Flexural stress
Q. Standard unit of turbidity of water is in one litre of distilled water, one milligram of finelydivided
a. Silica
b. Mud
c. Clay
d. Organic matter
Q. For complete stabilisation of organic matter in polluted water, it takes
a. 5 days
b. 10 days
c. 20 days
d. 30 days
Q. If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchmentin square kilometres is A, the total run-off Q, is given by
a. Q = 1.758 × 102× API (B) (C) (D)
b. Q = 2.758 × 102× API
c. Q = 2.758 × 103× API
d. Q = 2.758 × 103× A/PI