Thursday, May 7, 2015

Objective question set-I (Water Supply Engineering)


                 1.       The device installed for drawing water from the source are called
                  -Intake
                2.       Factors considered in selection of site for intake is that it should be
                  a. nearer to the treatment plant  
                  b. in pure zone of the water source
                   c. upstream of the point of disposal of waste water  
                   d. all of the above*
                 3.       Gravity water supply system starts from
                    -Intake
                 4.       “Puits devlopee” is generally provided in case of
                   -well
                  5.       Infiltration gallery is a horizontal well
                  6.       Minimum depth of infiltration gallery is 2m
                  7.       The aquifer having least water  bearing capacity is
                  -Perched aquifer
                  8.       Water shed control method is used to control
                  -Sedimentation in reservoir
                   9.       Shrouding is the process of filling gravel, bajri etc. in
                  -Slotted tube well
                  10.   The radius of influence of well varies with
                -rate of pumping
                  11.   Coefficient of permeability is maximum for
                 a. Clean gravel*
                 b. Clay
                 c. Fine Sand
                d. silt
                   12.   An aquiclude is – a confined bed of impervious material between aquifer.
                   13.   A perched aquifer generally occurs
                 -above the water table
                   14.   The specific retention is least in the soil type
                  a. Clay
                  b. Sand
                  c. Silt
                  d. Coarse gravel*
                    15.   To determine velocity of flow of underground water, the most commonly used            non-imperial formula is
              -Dracy’s formula
                    16.   The location of a well is considered to be good, if it is sunk into
                 -Coarse gravel
                    17.   The dug well or open well
                  a. has diameter 1 to 4m
                  b. suitable for small discharge of about 20cum/hr
              c. are cheap in construction
                  d. all of the above *
                    18.   Specific yield of wells is expressed as
                  -m3/hr
                     19.   The most widely used tube well in Nepal is
                 -Strainer well
                    20.   For insignificant effect on the water table,the tube wells are be spaced as one in every
                 -1.5Km
                    21.   The interference of well depends upon
               a. no. of well
               b. spacing between wells
               c. types of well
              d. all of the above*
                22.   Strainer type tube well are considered unsuitable for
              -Fine sand strata
                23.   Break pressure tank is generally provided in rural water supply scheme if static head           exceed
           -60m
               24.   The type of form work provided for ferro cement tank in rural water supply scheme is
            -HDP Pipe
               25.   Sickness of tube well indicates
           -Reduction in yield
               26.   The relation between porosity, specific yield and specific retention is
          -Porosity= Specific yield+ Specific retention
               27.   For good test a desirable temperature of water is,
          -Less than 11oC
              28.   Permissible colour for drinking water is not more than
          -5 units
               29.   Turbidity is measured by,
          -Intensity of light scattered when light is passed through.
               30.   Units of turbidity are
           a. mg/l
           b. Ntu*
           c. Pcu
           d. Threshold number

                31.   The standard unit of turbidity is produced when,
             a. 1mg of silicon dioxide is dissolved in 1 litre of distilled water.
             b. 1mg of platinum is dissolved in 1 litre of distilled water.
              c. 1mg of sodium chloride dissolved in 1 litre of distilled water.
              d. 1mg of cobalt being dissolved in 1 litre of distilled water*


                 32.   Conductivity represents the concentration of the following in the water sample
             a. total solid                                                        b. dissolved solid*
             c. volatile solid                                                   d. fixed solid
                 33.   Conductivity is standardize at
            =25oC

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