List of top Water Science and Technology Questions

Who among the followings is known as father of soil physics ?

The range of Cation exchange capacity of kaolinite clay mineral is :

In saline soils boron concentration is very important from plant growth point of view. What is the safe limit of water soluble boron concentration in a saline soil.

The gypsum equivalent of sulphuric acid for 2000 kg of gypsum is :

The yield of many crops is restricted at what range of electrical conductivity of the saturation extract of a soil :

At what value of sodium adsorption ratio, a soil is considered as Alkali soil :

If the soil in a core of diameter 4 cm, height 7 cm, weighs 170 g after drying and the weight of core without soil is 50 g, then the bulk density of the soil is :

Matric Potential of which of the following is low :

A swimmer is at 2 meter above the bottom in an 8 m deep rectangular pond which is filled to \(3/4^{\text{th}}\) of its depth. What will be the pressure on the swimmer?

In a hydraulic conductivity study, a 15 cm thick water-saturated soil layer was allowed a 15 cm water layer above it vertically, and the water was allowed to pass through the soil for 45 minutes. A total of 540 cc of water was collected. The cross-sectional area of the soil layer was 30 cm². Calculate the discharge rate of flow of water through the soil.

Which one of the followings is not true about soil consistency ?

Soil primary particles sand, silt and clay are arranged to form which of the following :

Which of the following is not a physical property of soil ?

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : High concentration of sodium in irrigation water is not desirable.
Reason (R) : It causes deflocculation of soil aggregates and seals the pores.
In light of the above statements, choose the correct answer from the options given below.

If irrigation water contains carbonate, bicarbonates, calcium and magnesium ions as 4.0, 2.0, 2.5 and 1.5 me/L^-1, respectively, then the residual sodium carbonate content of irrigation water is:

The concentration of salt in the irrigation water having EC of 20 dS/m is :

Which of the following equation expresses the velocity of settling particles as described by Stokes law ?

Criteria for selection of site for construction of embankment type of water harvesting structures are:
(A) The site should be 0.5 km away from settlement area.
(B) The permeability of the soils in storage area should be minimum in percolation tank.
(C) The command area should be as close as possible to the dam/pond site.
(D) The downstream area should permit natural passage for safe disposal of surplus water.
Choose the correct answer from the options given below :

Arrange the followings in terms of their lower to higher value of run off coefficients for silt type of soil at 10 – 30% slope.
(A) Cultivated land
(B) Pasture land
(C) Forest land
Choose the correct answer from the options given below :

The year in which the common guideline for watershed development projects by Government of India formulated was :

Precipitation is measured using ____________.
(A) Raingauge
(B) Pluviometer
(C) Ombrometer
(D) Hyetometer
Choose the correct answer from the options given below:

The diameter of circular collecting area of Symon's gauge is ____________.