Practice Water Resources Engineering Multiple Choice Questions with Answers Quiz-2

Q.1.

A recording type rain gauge

produces a mass curve of rain fall
records the cumulative rain
is sometimes called integrating rain gauge or continuous rain gauge
all the above.

Q.2.

Pick up the correct statement from the following :

Absolute humidity at a given temperature is equal to weight of moisture present in a unit volume
Relative humidity is the ratio of actual vapour pressure and saturation vapour pressure at the same temperature
Relative humidity is the ratio of the weight of the vapours present per unit volume to the weight of vapours which could be contained at the same temperature when fully saturated
Humidity can be measured by psychrometer
All the above.

Q.3.

Pick up the correct statement from the following :

Rivers, lakes, oceans and springs get water from the rains
Rain water is obtained by evaporation from rivers, lakes and oceans
Water remains in atmosphere as vapours
Hydrologic cycle is a continuous process of evaporation and precipitation of water in atmosphere
all the above.

Q.4.

The infiltration capacity during rain storm, is considerably reduced due to

surface detention
soil moisture
compaction due to rain
washing of fine particles
all the above.

Q.5.

Pick up the correct statement from the following :

When rainfall rate exceeds the infiltration capacity, the water enters the soil at full capacity rate
When rainfall rate is less than the infiltration capacity, the infiltration rate is approximately equal to the rainfall rate
The actual infiltration rate at any time may be equal to or less than the infiltration capacity
The actual prevailing rate of infiltration of water in the soil at any time, is known as infiltration rate
All the above.

Q.6.

In India the recording type rain gauge generally used, is

weighing type
tipping type
float recording type
none of these.

Q.7.

Absolute humidity in air

decreases at higher altitudes
increases at higher altitudes
remains constant at all altitudes
none of these.

Q.8.

If the potential infiltration of a water shed having a soil with fair pasture cover, iscm and rainfall iscm, the direct run off is :

2 cm
3 cm
5 cm
8 cm.

Q.9.

The run off a drainage basin is

Initial recharge + ground water accretion + precipitation
Precipitation + ground water accretion + initial recharge
Precipitation - ground water accretion + initial recharge
Precipitation - ground water accretion - initial recharge.

Q.10.

A well penetrates tom below the static water table. Afterhours of pumping at 31.litres/minute, the water level in a test well at a distance ofm is lowered by 0.5 m and in a wellm away water is lowered by 1.0 m. The transmissibility of the auifer, is

1.185 m²/minute
1.285 m²/minute
1.385 m²/minute
1.485 m²/minute
1.585 m²/minute.

Q.11.

The quantity of water retained by the sub-soil against gravity, is known

yield
porosity
specific yield
specific retention
none of these.

Q.12.

For computing the run off volumes of large areas, number of infiltrations used are

2
3
4
5

Q.13.

A unit hydrograph is a hydrograph of a rain storm of a specified duration resulting from a run-off of

15 mm
20 mm
25 mm
30 mm.

Q.14.

The deficiency in rain catch due to vertical acceleration of air forced upward over the gauge, is

greater for heavy rain
greater for lighter rain
greater for large drops
lesser for small rain drops.

Q.15.

The best instrument for measuring the velocity of a stream flow is

pitot tube
Price's current meter
surface float
sub-surface float.

Q.16.

Shrouding is provided in

cavity type tube wells
slotted type tube wells
strainer type tube wells
perforated type tube wells.

Q.17.

If the grain size of soil increases

surface area decreases
specific retention decreases
specific yield increases
water supply in well increases
all the above.

Q.18.

Pick up the incorrect statement from the following :

The rate of flow of water through a unit cross-sectional area under a unit hydraulic gradient, is called coefficient of permeability
The rate of flow of water through a vertical strip of the acquifer of unit width and full depth under a unit hydraulic gradient, is called coefficient of transmissibility
The flow of water through acquifers, is governed by the Darcy's law
The term 'transmissibility' was introduced by Meinzer
The ratio of coefficient of transmissibility and coefficient of permeability, is equal to the depth of acquifer through which water flows.

Q.19.

For high flood estimates the average value of the constant C in Dicken's formula Q = CA^3/4, is

6.5
8.5
9.5
10.5
11.5

Q.20.

Time of overland flow, is affected by

slope of the basin
type of the ground surface
length of the flow path
all the above.

Q.21.

The rainfall at any place is described by

its intensity
its duration
its frequency
all the above.

Q.22.

The Dupuit formula is based on

one observation well
two observation wells
three observation wells
no observation well
none of these.

Q.23.

From the Survey of India map, the distance of the critical point iskm and difference in elevation ism. The over land flow time, is

2 hours
3 hours
2 hours and 30 minutes
3 hours and 30 minutes
4 hours.

Q.24.

The polythene bottles are used for collecting rain water and. their capacities is

2 litres
4 litres
10 litres
all the above.

Q.25.

Pick up the correct statement from the following :

The specified duration of unit hydrograph, is called unit duration
The rain during specified duration, is called unit storm
A unit hydrograph for a particular unit duration may be utilised for evaluating the run off hydrographs of other storms of like durations
The number of unit hydrographs for a given basin, is theoretically infinite
All the above.

Q.26.

If a gauge is installed perpendicular to the slope, its measurement is reduced by multiplying

sine of the angle of inclination with vertical
cosine of the angle of inclination with vertical
tangent of the angle of inclination with vertical
calibration coefficient of the gauge.

Q.27.

Pick up the correct statement from the following :

If ground water enters the channel, the channel is known as effulent channel
If water goes out of channel to meet ground water, the channel is said to be influent stream
If the water table is at higher level than the water level in channel, ground water flows to the stream
If the water level in stream is higher than the water table level, water from the channel enters into ground water
All the above.

Q.28.

Pick up the correct statement from the following :

Higher the gauge, more deficient will be the rain catch
Heavier the rain, lesser will be the rain catch
The trees serving as wind brakes in the vicinity of the gauge, should not subtend angles greater than 45°
Coniferrous forest is idealy suited for installing the gauge
All the above.

Q.29.

Rain simulators are used for the determination of

evaporation
precipitation
run off
infiltration capacity
none of these.

Q.30.

Relative humidity is the ratio of actual vapour pressure to the saturation vapour pressure

at the same temperature
at the same pressure
in the same volume
in the atmosphere.

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