1 >>Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be ?
- (A) nil
- (B) 5
- (C) 10
- (D) 15
2 >>Acidity in water is caused due to ?
- (A) Mineral acids
- (B) Free CO2
- (C) Iron sulphate
- (D) All the above
3 >>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
4 >>The velocity of flow does not depend on ?
- (A) grade of sewer
- (B) length of sewer
- (C) hydraulic mean depth of sewer
- (D) roughness of sewer
Civil Engineering Quiz | Civil Engineering MCQ
5 >>Pick up the correct statement from the following : ?
- (A) Lead and barium salts have toxic effect
- (B) Arsenic and selenium are poisonous to human health
- (C) Higher copper content affects the lungs
- (D) All the above
6 >>The specific retention is least in case of ?
- (A) Clay
- (B) Sand
- (C) Silt
- (D) Coarse gravel
7 >>Most commonly used pump for lifting water in water supply mains, is ?
- (A) axialflow pump
- (B) reciprocating pump
- (C) rotary type pump
- (D) centrifugal pumps
8 >>Economic height of a dam is the height corresponding to which ?
- (A) cost of the dam per unit of storage is minimum
- (B) amount of silting is less
- (C) cost of dam per unit storage is maximum
- (D) free board provided is least
9 >>Distribution mains of any water supply, is normally designed for its average daily requirement ?
- (A) 1
- (B) 1.5
- (C) 2
- (D) 225%.
10 >>If pH value of water is ?
- (A) 7 water it is said to be neutral
- (B) less than 7 it is said to be acidic
- (C) more than 7 it is said to be alkaline
- (D) all the above
11 >>In pressure supply mains, water hammer pressure is reduced by providing ?
- (A) sluice valves
- (B) air valves
- (C) pressure relief valves
- (D) none of the these
12 >>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
13 >>Corrosion of a pipe ?
- (A) reduces its life span
- (B) reduces its carrying capacity
- (C) adds colour to water
- (D) all the above
14 >>Pick up the correct statement from the following : ?
- (A) Detention period for plain sedimentation tanks ranges between 4 to 8 hours
- (B) Detention period for sedimentation tanks, using coagulants usually ranges between 2 to 4 hours
- (C) The horizontally flow velocity in sedimentation tanks, is generally limited to 0.3 m/minute
- (D) All the above
15 >>The maximum permissible nitrites in public water supplies, is ?
- (A) Nil
- (B) 0.5 P.P.M.
- (C) 1.0. P.P.M.
- (D) 1.5 P.P.M
16 >>A high velocity of wash water is required for ?
- (A) rapid gravity filter with strainers
- (B) rapid gravity filter without strainers
- (C) slow sand filter with strainers
- (D) slow sand filter without strainers
17 >>In distribution pipes, drain valves are provided at ?
- (A) lower point
- (B) higher point
- (C) junction points
- (D) any where
18 >>Corrosion of well pipes may not be reduced by ?
- (A) reducing the draw down and the pumping rate
- (B) reducing the flow velocity
- (C) using thicker pipes
- (D) using screens having larger area of openings
19 >>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
20 >>The population growth curve is ?
- (A) Sshaped curve
- (B) parabolic curve
- (C) circular curve
- (D) straight line
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