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 = CA3/4, 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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