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
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
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*
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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