Q.1

The bacterias which require free oxygen for their survival, are called

  • Aerobic bacterias
  • Anaerobic bacterias
  • Faculative bacteria
  • None of these.
Q.2

High pH value of water does not produce

  • incrustation
  • sediment deposits
  • turberculation
  • corrosion
  • both (c) and (d).
Q.3

The type of pipe commonly used in water supply distribution schemes, is

  • R.C.C. pipes
  • Hume pipes
  • Cast iron pipes
  • G.I. pipes.
Q.4

The depth of the water table at a place ism below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is

  • Centrifugal pump
  • Reciprocating pump
  • Deep well turbine pump
  • None of these.
Q.5

The fire demand for a city ofpopulation, according to Godrich formula, is

  • 40 mld
  • 42 mld
  • 44 mld
  • 48 mld.
Q.6

To detect the turbidity of the order of 0 toP.P.M. the instrument used is

  • turbidimeter
  • Jackson turbidimeter
  • Baylis turbidimeter
  • Hallige turbidimeter.
Q.7

Most commonly used section in grade aqueducts, is

  • circular
  • rectangular
  • parabolic
  • horse shoe section.
Q.8

In pumping stations, the type of joint generally used, is

  • socket and spigot joint
  • flanged joint
  • expansion joint
  • dresser coupling joint
  • flexible joint.
Q.9

High pH value of water does not produce

  • incrustation
  • sediment deposits
  • turberculation
  • corrosion
  • both (c) and (d).
Q.10

Sluice valves are fitted in a distribution system

  • along straight length of pipes at suitable intervals
  • at the junctions of the pipes
  • at the branching off points of sub-mains
  • all the above.
Q.11

Maximum threshold number permitted for indicating the odour of public water supplies, is

  • 1
  • 2
  • 3
  • 4
  • 5
Q.12

To detect the turbidity of the order of 0 toP.P.M. the instrument used is

  • turbidimeter
  • Jackson turbidimeter
  • Baylis turbidimeter
  • Hallige turbidimeter.
Q.13

Distribution of wash water is provided in

  • sedimentation tank
  • slow sand filter
  • rapid gravity filter
  • all the above.
Q.14

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.
Q.15

The efficiency of sedimentation tank does not depend upon

  • depth of tank
  • length of tank
  • detention period
  • velocity of water.
Q.16

Standard process of chlorination of water, is done by

  • plain chlorination
  • pre-chlorination
  • post-chlorination
  • double chlorination.
Q.17

The permissible pH value for public water supplies may range between

  • 4.5 to 5.5
  • 5.5 to 6.5
  • 6.5 to 8.5
  • 8.5 to 10.5
  • none of these.
Q.18

The detention period for plain sedimentation water tanks, is usually

  • 4 to 8 hours
  • 8 to 16 hours
  • 16 to 24 hours
  • 24 to 36 hours.
Q.19

litres of water per person per day, is provided in

  • office buildings
  • hotels
  • hostels
  • nurse's homes.
Q.20

The valves provided at low points of pipes to drain off water quickly under gravity, are called

  • blow off valves
  • drain valves
  • sewer valves
  • all the above.
Q.21

The population of a city inisThe average per decade of the previous records of population isand average percentage per decade is 20%. The population of the city based on geometrical increase method, in the yearwill be

  • 56, 000
  • 60, 000
  • 64, 000
  • 70, 000
  • 72, 000
Q.22

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
  • none of these.
Q.23

When the reduced level of the water source is higher than the reduced level of the consumer's place, water is generally supplied

  • by pumping system
  • by gravitational system
  • both (a) and (b)
  • all the above.
Q.24

If the chosen diameter of a pipe, is less than the economical diameter

  • cost of pipe will be less
  • head loss will be high
  • cost of pumping will be more than saving
  • all the above.
Q.25

The lowest outlet sluice in a dam is provided

  • below the dead storage
  • on the top level of dead storage
  • on the top level of useful storage
  • at the centre of the dam.
Q.26

The strainer type tube well, is unsuitable for

  • coarse gravels
  • fine sandy strata
  • clean gravels
  • none of these.
Q.27

The maximum permitted loss of head in a rapid sand filter, is

  • 1 m
  • 2 m
  • 3 m
  • 4 m
  • 5 m.
Q.28

Turbidity of water may be caused due to

  • Suspended clay
  • Suspended silt
  • finely divided organic material
  • all the above.
Q.29

Pick up the incorrect statement from the following :

  • Free surface ground water is subjected to atmospheric pressure
  • Water table surface rises and falls with seasons
  • Depth of water table is directly proportional to the rate of drawal of water
  • Level of water table remains stationary
  • None of these.
Q.30

Estimates of a water supply project depends upon the rate of water supply per capita consumption and probable population estimated at the end of the design period of

  • 5 to 10 years
  • 10 to 15 years
  • 15 to 20 years
  • 20 to 30 years
  • 25 years.
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