List of top Water Science and Technology Questions on Basics of Soil Science asked in ICAR AIEEA (PG)

Most hazardous element in the irrigation water in relation to crop growth and production is
The most desirable soil structure is
Perched water table is found in
Which of the following dispersing agent is used in determination of the particle size distribution of soils?
The peak rate of runoff can be estimated using the
Which of the following is not true for cover crops?
The proportionality factor in the Darcy's equation is known as:
Which ion is the dominant ion adsorbed on clay surfaces under very acidic conditions?
Followings are the statements with respect to the addition of liming materials in the soils.
(A). All liming materials (oxides, hydroxides or carbonates) when applied to an acid soil react with carbon dioxide and water to yield bicarbonates.
(B). When applied to an acid soil, the hydrogen and aluminium in the liming materials replace the magnesium and calcium on the colloidal complex.
(C). Applied carbonate and bicarbonate liming materials replace hydrogen and aluminum on the colloidal complex leading to the evolution of free carbondioxide
(D). Adsorption of calcium and magensium ions raises the percentage base saturation of the colloidal complex in turn decreasing the soil pH.
Choose the correct answer from the options given below:
Which of the following is determined using a nomograph?
Which of the following is true with respect to the Stoke's Law?
(A) It relates to the terminal settling velocity of particles in a viscous medium.
(B) It relates the terminal settling velocity to particle radius and density.
(C) It is applied in the determination of the particle size distribution.
(D) It is applicable only to the spherical particles.
Choose the correct answer from the options given below:
Which of the following term represents an empirical measurement supposed to represent the soil profile's ability to retain water after the process of internal drainage has ceased?
A sample of moist soil with a wet mass of 1.0 kg and a volume of 0.64 liters (6.4 $\times$ 10$^{-4}$ m$^3$) was dried in the oven and found to have a dry mass of 0.8 kg. Assuming the typical value of particle density (2650 kg/m$^3$) for a mineral soil, what will be the volumetric moisture content?
What is the equivalent depth of water contained in a soil profile of 1 m deep, if the mass wetness of the upper 0.4 m is 15% and that of the lower 0.6 m is 25%? Assume a bulk density of 1200 kg/m$^3$ in the upper layer and 1400 kg/m$^3$ in the lower layer.
Which among the followings is the most appropriate statistical equivalent of the technique used in interpretation of soil texture from particle size data?
For a saturated soil, the ratio of the rate of flux of water per unit area per unit time to the potential gradient is known as
______ is an index of the fractional pore space in soil that relates space to the volume of solids rather than to the total volume of the soil.
Read the following statements about black soils
(A). These have dark colour.
(B). These have high clay content.
(C). These have low CEC.
(D). These are rich in organic matter and nitrogen.
(E). These are normally suitable for cultivation of cotton.
Choose the correct answer from the options given below:
Given below are two statements :
Statement (I) : Soil having high amount of hydrogen ions affect the nutrient availability.
Statement (II) : Increased soil pH beyond 7.0 increases the availability of micronutrients.
In light of the above statements, choose the most appropriate answer from the options given below. :
Among the following statement(s), what is true about colloids?
(A) They do not settle down when left undisturbed
(B) They are not visible to the naked eyes
(C) Their size generally ranges between \(10^{-5}\) and \(10^{-7}\) cm
(D) A colloidal solution is homogeneous in nature
Choose the correct answer from the options given below:
Which of the following match(es) is correct ?
(A) Laterite soil - pH 7-8
(B) Black soil - has high amount of clay
(C) Alkali soil - pH 9
(D) Red soil - calcareous
Choose the correct answer from the options given below :
What are the type of phosphate ions available for plant uptake in alkali soil ?
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.