Q.1 Which element is most important for flocculation of soil
Na K Ca
Q.2 pH and pOH are?_________.
positively related negatively related no relationship
Q.3 Optimum pH for the growth and yield of rice is?
7.0-8.0 3.0-5.0 4.0-6.0
Q.4 Actinomycetes prefer________.
neutral condition acidic condition slightly alkaline condition
Q.5 Availability of boron and molybdenum is greatest under the pH?
7.0-7.5 6.5-7.5 above 7.5
Q.6 Among the following elements which is dominating element in earth crust?
Lithophile Chalcophile siderophile
Q.7 Which rocks are known as stratified rocks?
Igneous sedimentary metamorphic
Q.8 Slate is formed due to the metamorphism of__________.
sandstone shale limestone
Q.9 Specific gravity of heavy minerals is__________.
<2.85 >2.9 <6
Q.10 Among the following which rocks dominated in earth crust (upto 5 km depth)?
Q.11 Potential acidity is also known as?
active acidity exchange acidity reserve acidity
Q.12 Dominant cations responsible for soil acidity are______.
H Al Both
Q.13 Which is preferring pH for azatobactor?
acidic alkali neutral
Q.14 The relationship between base saturation and pH is_______.
positive negative Isomorphic
Q.15 Soil salinity is mainly due to__________.
Cl SO4 Both
Q.16 Which element is most important for deflocculation of soil?
Q.17 Which soil type is more badly affected by excessive soluble salts concentration?
sandy loam clay
Q.18 Under acidic soils akiochi disease in rice developed due to the toxicity of_________.
S Al H2S
Q.19 Neutralizing value of calcite is?
179 86 100
Q.20 Availability of Zn and Fe is greatest under the pH?
7.0-7.5 6.5-7.5 < 5.5
Q.21 The pH ranges for most mineral soils_________.
6.0 to 7.0 5.5 to 8.5 3.5 to 10.5
Q.22 Availability of phosphorus is highest when the reaction is between__________.
5.5 to 7.5 6.0 to 8.0 6.5 to 7.5
Q.23 H2PO4- ions and HPO4-2 ion are in equilibrium condition in soil at PH________.
7.52 6.50 7.22
Q.24 Most suitable method for management of acid sulphate soil is_________.
Scrapping Flooding addition of Gypsum
Q.25 The process of break-down of H- Clay under alkaline condition is known as________.
Solodization Solonization Salinization
Number of score out of 25 = Score in percentage =
QuiZ: 1 2 3 4 5 6
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