Q.1

A circular gravity aqueduct is not generally preferred to because of

  • its maximum hydraulic mean depth
  • maximum area per unit of wetted perimeter
  • minimum cost of construction
  • its proper support on the ground.
Q.2

The requirement of water per capita per day, is

  • 90 litres
  • 150 litres
  • 250 litres
  • 400 litres.
Q.3

If n is porosity, y is specific yield and r is specific retention of any soil, the relationship which holds good, is

  • n + y + r = 1
  • n + y = r
  • n + r = y
  • y + r = n
  • n + r + y = 0
Q.4

Pick up the incorrect statement from the following :

  • Porosity of clay sand soil is 45%
  • Porosity of pure sand is 35%
  • Porosity of sand stone is up to 15%
  • Least porosity is that of granite and quartz
  • None of these.
Q.5

An aquiclude is

  • a non artesian aquifer
  • an artesian acquifer
  • a confined bed of impervious material between acquifers
  • a large water body under ground.
Q.6

The external load per unit length of

  • a pipe laid on, or projecting above the undisturbed ground and covered with fills, is proportional to the square of the external diameter of the pipe
  • a flexible pipe burried in narrow trenches and thoroughly compacted side fills, is proportional to the product of the width of the trench and diameter of the pipe
  • a rigid pipe burried in a narrow trenches and thoroughly compacted side fills, is proportional to the square of the width of the trench
  • all the above.
Q.7

The requirement of water per capita per day, is

  • 90 litres
  • 150 litres
  • 250 litres
  • 400 litres.
Q.8

Total flow in stream is known

  • run off
  • stream flow
  • discharge
  • all the above.
Q.9

Specific yield of a well is

  • quantity of water than can be drawn from the well
  • flow of water per unit time
  • total quantity of water available in the well
  • quantity of water per unit time per unit draw-down.
Q.10

A water channel supported above the ground over trestles, is generally called

  • flume
  • canal
  • adueduct
  • tunnel
  • all the above.
Q.11

Aqueducts are generally designed

  • circular
  • rectangular
  • horse shoe section
  • all the above.
Q.12

'Shrouding' is essentially provided in

  • strainer type wells
  • cavity type wells
  • slotted type well
  • all the above.
Q.13

Percussion drilling is unsuitable in

  • unconsolidated sand
  • unconsolidated gravel
  • quick sand
  • consolidated rocks.
Q.14

Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided

  • silica
  • mud
  • clay
  • organic matter.
Q.15

Water is supplied from the source to the treatment plant under gravity in

  • Calcutta
  • Delhi
  • Madras
  • Bombay.
Q.16

Pick up the incorrect statement from the following :

  • The net amount of water which joins the surface streams in a catchment, is known as surface run-off
  • The amount of water which joins the stream from the underground water, is called base flow
  • The yearly run off in cm depth over the catchment, is termed as the yield of the drainage basin
  • The yield of drainage in cm depth multiplied by the area of the catchment gives the annual volume of water
  • None of these.
Q.17

The total domestic consumption in a city water supply, is assumed

  • 20%
  • 30%
  • 40%
  • 60%.
Q.18

Disinfection of drinking water is done to remove

  • turbidity
  • odour
  • colour
  • bacterias
  • all the above.
Q.19

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
Q.20

The ensure proper growth of children's teeth, the quantity of flouride used in water mains, is

  • 1 mg/litre
  • 2 mg/litre
  • 3 mg/litre
  • 4 mg/litre
  • 5 mg/litre.
Q.21

Disinfection of water with ozone is not good because

  • it vanishes before water reaches the consumers
  • it removes the colour, taste and odour from water as bacterias
  • it adds taste to the water
  • it is more efficient than chlorine in killing bacterias
  • none of these.
Q.22

The ratio of total capacity and dead storage is kept

  • 8
  • 6
  • 4
  • 3
  • 2
Q.23

The requirement of water per capita per day, is

  • 90 litres
  • 150 litres
  • 250 litres
  • 400 litres.
Q.24

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.
  • 20 mg/litre.
Q.25

Chemical coagulation of drinking water, is done

  • to settle suspended materials
  • to increase rate of settlement of suspended materials
  • to remove the bacterias
  • none of these.
Q.26

An earth formation which, although porous and capable of absoring water does not provide an appreciable supply to wells, is known as

  • acquifer
  • aquiclude
  • aquifuge
  • none of these.
Q.27

The force which develops in a pressure conduit supported on trestles, is

  • tension
  • compression
  • temperature stress
  • flexural stress.
Q.28

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.
  • 20 mg/litre.
Q.29

Increase in population of a rapidly growing city, may be estimated by

  • arithmetical mean method
  • geometrical method
  • incremental increase method
  • graphical comparison method.
Q.30

The force which develops in a pressure conduit supported on trestles, is

  • tension
  • compression
  • temperature stress
  • flexural stress.
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