List of top Water Science and Technology Questions

Given below are two statements :
Statement (I) : Irrigation tubewells should be so located that there is no interference in the cone of depressions of the two adjoining tubewells.
Statement (II) : Drainage tubewells to lower water table should be so located that there is some interference in the cone of depressions of two adjoining tubewells.
In light of the above statements, choose the most appropriate answer from the options given below.

A centrifugal pump runs at 1500 revolution per minute (RPM) and delivers water against a head of 10 m. What would be the head developed if the pump is operated at 1650 RPM ?

A total station in drainage investigations is used to

Given below are two statements :
Statement (I) : When two pumps are installed in series, discharge remaining the same, water is lifted to greater height compared to a single pump.
Statement (II) : When two pumps are installed in parallel then not only the discharge increases but water is also lifted to greater height compared to a single pump.
In light of the above statements, choose the most appropriate answer from the options given below.

Which of the following statement related to pump Head versus Discharge characteristic curve is NOT true ?

Which method of drilling wells uses water and bentonite mixture (mud) as drilling fluid ?

A tube well is used to irrigate the field. It pumps 9000 m³ of water, out of which 8100 m³ reaches the field head. Calculate the farm irrigation system efficiency, if the irrigation water application efficiency is 60%.

Arrange the followings irrigation methods in ascending order (low to high) of their irrigation use efficiencies.
(A) Border irrigation
(B) Sprinkler irrigation
(C) Drip irrigation
(D) Flood irrigation
Choose the correct answer from the options given below :

Given below are four soil moisture constants
(A) Field capacity moisture content
(B) Saturation moisture content
(C) Hygroscopic moisture content
(D) Permanent wilting point
Choose the correct combination from the options given below that is used to calculate the total plant available water :

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : A tensiometer vacuum gauge has divisions in the range of 0 to 100 centibars although in practice the range of operation of a tensiometer is 0 to 85 centibars.
Reason (R) : At the upper limit of 85 centibars, the column of water in the tube will form water vapour bubbles and the instrument will cease to function.
In light of the above statements, choose the most appropriate answer from the options given below.

In water pumping terminology, acronym NPSHA stands for :

Four distinct growth stages are used to estimate crop evapotranspiration for which crop coefficients vary from one stage to another. In general the highest crop coefficient is at the stage :

The average variable cost is the result of ____________.

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Surface irrigation methods are the oldest, most commonly used methods and may continue to dominate irrigation scene in India.
Reason (R) : Farmers are quite familiar with surface irrigation being traditional in nature, easy to practice even with limited resources.
In light of the above statements, choose the most appropriate answer from the options given below.

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : A good measure of dispersion needs to be least affected by change in the sampling.
Reason (R) : Standard deviation is the best measure of dispersion.
In light of the above statements, choose the most appropriate answer from the options given below:

Followings are the statements related to water saving in drip irrigation. Identify the statement that is NOT correct.

Distance of throw of water through a sprinkler nozzle is not a function of :

In actual machines ____________.

Given below are two statements :
Statement (I) : The commercial unit of energy is 1 kWh.
Statement (II) : 1 kWh = \(2.6 \times 10^6\) J
In light of the above statements, choose the most appropriate answer from the options given below.

Given below are two statements :
Statement (I) : Differentiation and Integration are just opposite of each other.
Statement (II) : Differentiation is the slope of any curve at any point, while integration is the area under that same curve specified between two points.
In light of the above statements, choose the most appropriate answer from the options given below.

One dimensional flow is :

Which of the followings statements related to pressure are correct ?
(A) Gage pressure = Absolute pressure \(-\) Atmospheric pressure
(B) Absolute pressure = Gage pressure \(-\) Atmospheric pressure
(C) Absolute pressure = Atmospheric pressure \(+\) Vacuum pressure
(D) Gage pressure = Atmospheric pressure \(+\) Vacuum pressure
Choose the correct answer from the options given below:

The current flowing through the armature of a d.c. shunt machine at maximum efficiency is given by :

Following are the statements pertaining to power in pumps :
(A) The efficiency of any given pump (\(\eta\)) is a ratio defined as the water horsepower out divided by the mechanical horsepower into the pump
(B) No pump can convert all of its mechanical power into water power
(C) Mechanical power is lost in the pumping process due to friction and other physical losses
(D) It is because of these losses that the horsepower going into the pump must be greater than the water horsepower leaving the pump
Choose the correct answer from the options given below: