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This set of Water and Wastewater Engineering Multiple Choice Questions & Answers (MCQs) focuses on Water And Wastewater Engineering Set 11
Q1 | Percussion drilling is unsuitable in
- Unconsolidated sand
- Unconsolidated gravel
- Quick sand
- Consolidated rocks
Q2 | Rapid gravity filters can remove bacterial impurities up to a maximum of
- 50%
- 60%
- 70%
- 80%
Q3 | Continuous flow of water can be expected from
- Gravity springs
- Surface springs
- Artesian springs
- None of these
Q4 | Reciprocating pumps
- Are not suitable for variable heads
- Are four times costlier than centrifugal pumps
- Are not suitable for pumping water containing sediments
- Single stroke produce pulsating flow
Q5 | Low turbidity of water is detected by
- Turbidity tube
- Jackson turbidity meter
- Baylis turbidimeter
- Hellige turbidimeter
Q6 | Silt storage is the same as
- Dead storage
- Live storage
- Effective storage
- None of these
Q7 | The type of pipe commonly used in water supply distribution schemes, is
- R.C.C. pipes
- Hume pipes
- Cast iron pipes
- G.I. pipes
Q8 | Pick up the incorrect statement from the following. The source of surface water is from
- Streams and rivers
- Storage reservoirs
- Springs
- Ponds and lakes
Q9 | The discharge Q = 2????????/2.3 log10 (R/rw) for the confined tube well is obtained from
- Thiem's formula
- Darcy's formula
- Tolman's formula
- Dupuits formula
Q10 | m and n are monsoon duration factor and catchment factor respectively. If P is yearly rainfall in cm, runoff can be calculated by
- Velocity area method
- Weir or spillway method
- Use of venturi-meter
- Using power plant consumption
Q11 | In a rapid gravity filter
- Raw water from the source is supplied
- Disinfected raw water is supplied
- Raw water passed through coagulation tank is supplied
- None of these
Q12 | The maximum permissible nitrites in public water supplies, is
- Nil
- 0.5 P.P.M.
- 1.0. P.P.M.
- 1.5 P.P.M.
Q13 | Most commonly used section in grade aqueducts, is
- Circular
- Rectangular
- Parabolic
- Horse shoe section
Q14 | The most important and widely used tube well in India, is
- Strainer well
- Cavity well
- Slotted well
- Perforated pipe well
Q15 | Critical time for developing a water hammer, is the time required for
- Closing the valve
- The wave to travel from valve to the reservoir
- The wave to travel from the valve to the reservoir and back
- None of these
Q16 | Bacterias which can survive with or without free oxygen, are known
- Aerobic bacterias
- Anaerobic bacterias
- Facultative bacterias
- None of these
Q17 | The standard B.O.D. at 20°C, is taken for the consumption in
- 2 days
- 3 days
- 4 days
- 5 days
Q18 | Distribution of wash water is provided in
- Sedimentation tank
- Slow sand filter
- Rapid gravity filter
- All the above
Q19 | 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
- National Board of fire under-writers
- Freeman
- Kuichling
- None of these
Q20 | During treatment of water, sedimentation is done
- Before filtration
- After filtration
- Simultaneously with filtration
- Along with chlorination
Q21 | The ratio of the maximum daily consumption to the average daily demand, is
- 1
- 1.2
- 1.4
- 1.8
Q22 | From the surface of reservoir, evaporation may be minimized by sprinkling
- Spirit
- Hydrochloric acid
- Acetyl alcohol
- Methane
Q23 | The transitional middle portion of a logistic curve follows
- A geometric growth
- A logarithmic growth
- A first over curve
- A constant rate
Q24 | For plain chlorination of water, the quantity of chlorine used, is
- 0.1 mg/litre
- 0.2 mg/litre
- 0.3 mg/litre
- 0.5 mg/litre
Q25 | In distribution pipes, air valves are provided at
- Lower points
- Junction points
- Higher points
- Anywhere