On This Page
This set of Water and Wastewater Engineering Multiple Choice Questions & Answers (MCQs) focuses on Water And Wastewater Engineering Set 7
Q1 | Gravity conduits are generally in the form of
- Canals
- Flumes
- Aqueduct
- All the above
Q2 | The bed slope in slow sand filters, is generally kept
- 1 in 50
- 1 in 75
- 1 in 100
- 0.180555556
Q3 | Perched aquifers are generally found
- On the surface of the ground
- Below the surface of the ground but above water table
- Below the water table
- All the above
Q4 | Pick up the incorrect statement from the following:
- The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water
- Higher value of pH means lower hydrogen ion concentration
- Lower value of pH means higher hydrogen ion contraction
- Lower value of pH gives alkaline solution
Q5 | Mostly used coagulant, is
- Chlorine
- Alum
- Lime
- Bleaching powder
Q6 | A centrifugal pump is required to be primed before starting if it is located
- At higher level than water level of reservoir
- At lower level than water level of reservoir
- Both (a) and (b)
- Neither (a) nor (b)
Q7 | Normal values of overflow rate for plain sedimentation tank, is
- 250 to 500 litres/hr/m2
- 500 to 750 litres/hr/m2
- 750 to 1000 litres/hr/m2
- 1000 to 1250 litres/hr/m2
Q8 | 'Shrouding' is essentially provided in
- Strainer type wells
- Cavity type wells
- Slotted type well
- All the above
Q9 | The maximum permissible hardness for public supplies is
- 95 mg/litre
- 105 mg/litre
- 115 mg/litre
- 125 mg/litre
Q10 | The chlorine supply cylinders are generally kept at 38°C to 40°C to prevent
- Conversion into crystals
- It from burning
- It from explosion
- None of these
Q11 | For calculation of economical diameter D of a pipe in metres for a discharge Q to be pumped incumecs, Lea suggested the empirical formula
- D = 0.22 ??
- D = 1.22 ??
- D = 2.22 ??
- D = 3.22 ??
Q12 | An earth formation which, although porous and capable of absorbing water does not provide anappreciable supply to wells, is known as
- Aquifer
- Aquiclude
- Aquifuge
- None of these
Q13 | Property of earth to allow water to pass through it, is known as
- Perviousness
- Porosity
- Permeability
- Tr
Q14 | If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water atT°C, according to Stoke's law, is
- V = 418 (G - 1) d² [(3T + 70)/100]
- V = 418 (G - 1) d [(3T - 70)/100]
- V = 418 (G - 1) d² [(2T + 70)/100]
- V = 418 (G - 1) d 4 [(3T + 70)/100]
Q15 | Distribution mains of any water supply, is normally designed for its average daily requirement
- 100%
- 150%
- 200%
- 225%
Q16 | Maximum threshold number permitted for indicating the odour of public water supplies, is
- 1
- 2
- 3
- 4
Q17 | The rate of silting in a reservoir
- Is less in the beginning
- Remains constant throughout
- Is more in the beginning
- is more in the beginning and reduces in the end
Q18 | Corrosion of well pipes may not be reduced by
- Reducing the draw down and the pumping rate
- Reducing the flow velocity
- Using thicker pipes
- Using screens having larger area of openings
Q19 | Recuperation test is carried out to determine
- Turbidity of water
- pH value of water
- Yield of well
- Discharge from a well
Q20 | Pick up the incorrect statement from the following. The underground sources of water, is from
- Wells
- Springs
- Infiltration wells
- Storage reservoirs
Q21 | Most important method for calculating discharge for planning a water supply project, is
- Velocity area method
- Weir or spillway method
- Use of venturi-meter
- Using power plant consumption
Q22 | In a rapid sand filter, air binding is caused due to excessive
- Negative pressure
- Pressure
- Turbidity
- Water pressure
Q23 | One degree of hardness of water means a content of salts of
- 10.25 mg/litre
- 12.25 mg/litre
- 14.25 mg/litre
- 16.25 mg/litre
Q24 | The U.C. (uniformity coefficient) D60/D10 for the best filter media sand should be
- 2
- 3
- 4
- 5
Q25 | Manholes are less common in
- Cast iron pipes
- Steel pipes
- Hume steel pipes
- R.C.C. pipes