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This set of Water and Wastewater Engineering Multiple Choice Questions & Answers (MCQs) focuses on Water And Wastewater Engineering Set 10
Q1 | Normal values of overflow rate for plain sedimentation tanks in litres/hr/m2, generally range between
- 100 to 250
- 250 to 500
- 500 to 750
- 750 to 1000
Q2 | P.V.C. pipes can withstand pressure bead of water upto
- 25 m
- 50 m
- 75 m
- 100 m
Q3 | Most commonly used pump for lifting water in water supply mains, is
- Axial flow pump
- Reciprocating pump
- Rotary type pump
- Centrifugal pumps
Q4 | The fire demand for a city of 50,000 populations, according to Godrich formula, is
- 40 mld
- 42 mld
- 44 mld
- 48 mld
Q5 | If V is total consumption of water in litres for a population of N individuals, per capitaconsumption or water allowance for the water supply Q, is given by
- Q = V/12N
- Q = V/24N
- Q = V/265N
- None of these
Q6 | For controlling algae, the most commonly used chemical, is
- Copper sulphate
- Alum
- Lime
- Bleaching powder
Q7 | The storage capacity of a reservoir may be divided into three zones. The lowest zone is
- Dead storage
- Useful storage
- Surcharge storage
- None of these
Q8 | Economic height of a dam is the height corresponding to which
- Cost of the dam per unit of storage is minimum
- Amount of silting is less
- Cost of dam per unit storage is maximum
- Free board provided is least
Q9 | For maximum alkalinity of water, pH value should be
- Zero
- Less than 7
- More than 7
- 14
Q10 | The efficiency of a pumping set, is generally assumed
- 50%
- 55%
- 60%
- 65%
Q11 | The population growth curve is
- S-shaped curve
- Parabolic curve
- Circular curve
- Straight line
Q12 | The fire demand for ascertaining the empirical formula 1136.5 [(P/10) + 10] known as
- Kuichling's formula
- Buston's formula
- Freeman formula
- Under Writers formula
Q13 | The bacterias which may survive with or without free oxygen, are called
- Aerobic bacterias
- Anaerobic bacterias
- Facultative bacteria's
- None of these
Q14 | Aeration of water is done to remove
- Odour
- Colour
- Bacterias
- Turbidity
Q15 | The maximum pressure to which cast iron pipes may be subjected to, is
- 3 kg/cm2
- 5 kg/cm2
- 7 kg/cm2
- 10 kg/cm2
Q16 | Water may not contain much impurity if its source is
- Reservoirs
- Stream flowing in plains
- Lakes in lower regions
- Spring along hill slopes
Q17 | If p is total internal pressure, d is diameter of pressure conduit and t is thickness of conduit, theHoop's stress is
- ??????/??
- ??????/2??
- dp/2t
- dt/2p
Q18 | Turbidity of water is expressed
- In ppm
- In numbers in an arbitrary scale
- By pH value
- By colour code
Q19 | In plain sedimentation tanks under normal conditions, impurities are removed upto
- 60%
- 70%
- 80%
- 90%
Q20 | In slow sand filters, the turbidity of raw water can be removed only up to
- 60 mg/litre
- 75 mg/litre
- 100 gm/litre
- 150 mg/litre
Q21 | Pressure relief valves are provided in water mains
- To reduce the pressure
- At low points
- Upstream of sluice
- All the above
Q22 | Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be
- Nil
- 5
- 10
- 15
Q23 | At break point of chlorination,
- Chlorine is used to oxidise
- Residual chloride is zero
- Residual chloride is maximum
- Residual chlorine reappears
Q24 | The capability of a soil mass of full width and depth to transmit water, is known
- Porosity
- Permeability
- Transmissibility
- None of these
Q25 | By boiling water, hardness can be removed if it is due to
- Calcium sulphate
- Magnesium sulphate
- Calcium nitrate
- Calcium bicarbonate