RPSC Rajasthan ARO Agricultural Chemistry 2022 Solved Paper (English) — Agri Master Mind
The mushroom rocks remnants in the Aravalli regions are formed due to: (RJ ARO Agri. Chemestry 2022)
- Wind erosion
- Water erosion
- Exfoliation
- Moraine
The seventeenth essential nutrient, Nickel essentiality was first recognized by: (RJ ARO Agri. Chemestry 2022)
- Amon & Stout
- Sommer, Lipman & Mckinney
- Warington
- Brown, Welch & Cary
In which year was the soil health card scheme launched? (RJ ARO Agri. Chemestry 2022)
- February, 2017
- February, 2015
- February, 2016
- February, 2014
The scattering of light by colloid is called: (RJ ARO Agri. Chemestry 2022)
- Brownian movement
- Tyndall effect
- Dialysis
- Coagulation
Phosphate fixation pushes the ZPC towards the- (RJ ARO Agri. Chemestry 2022)
- higher pH
- lower pH
- first increases, then decreases
- not affected
The zeta potential of soil particles is lowest, whose exchange sites are saturated by- (RJ ARO Agri. Chemestry 2022)
- Potassium
- Sodium
- Calcium
- Ammonium
According to United Nations Environment Programme (UNEP, 1995), dirty dozen compounds were identified as persistent organic pollutants; among these, organo-chlorine pesticides are- (RJ ARO Agri. Chemestry 2022)
- aldrin, chlordane, DET, heptachlor
- aldrin, dioxins, furans, heptachlor
- chlordine, DDT, furans, aldrin
- dioxins, furans, HCB, DDT
Under continued and prolonged submergence, soil tends to become- (RJ ARO Agri. Chemestry 2022)
- Acidic
- Neutral
- Alkaline
- No change
The phenomenon of Cation Exchange was discovered by (RJ ARO Agri. Chemestry 2022)
- J. Thomas Way
- Gomez, A. A.
- Venanlow
- Krishnamoorthy
The adjusted sodium adsorption ratio (Adj SAR) was first proposed by (RJ ARO Agri. Chemestry 2022)
- Eaton (1950)
- Richards (1954)
- Bear (1964)
- Suarez (1981)
The specific gravity (g/ml) of sulfuric acid is- (RJ ARO Agri. Chemestry 2022)
The sulfur status of normal soil as extracted by 0.15% CaCl₂ is interpreted as medium, when the sulfur content is- (RJ ARO Agri. Chemestry 2022)
- mg/kg
- mg/kg
- mg/kg
- mg/kg
The Itai-itai and Minamata diseases are caused due to toxicity of (RJ ARO Agri. Chemestry 2022)
- Cd and Ni
- Cd and Hg
- Zn and Hg
- Zn and Ni
In the black cotton soils of India, the dominant group of layer silicate clay minerals found is- (RJ ARO Agri. Chemestry 2022)
- Kaolinite
- Illite
- Smectite
- Chlorite
In cation exchange equations for divalent-monovalent ion exchange processes, the most widely used ion exchange equation is given by- (RJ ARO Agri. Chemestry 2022)
- Kerr (1928)
- Vanselow (1932)
- Gapon (1933)
- Jenny (1941)
The oven-dry weight of 50 gm soil collected from the field was 40 gm; if the bulk density of the soil is 1.5 gm/cm³, the volumetric water content would be- (RJ ARO Agri. Chemestry 2022)
- %
- %
- %
- %
Devarda alloy is composed of- (RJ ARO Agri. Chemestry 2022)
- % Al, 45% Zn, 5% Cu
- % Al, 45% Cu, 5% Zn
- % Zn, 45% Al, 5% Co
- % Cu, 45% Al, 5% Zn
Soil Taxonomy published by the US soil survey staff was in the year of- (RJ ARO Agri. Chemestry 2022)
In aqua regia, the ratio of HCl to HNO₃ is- (RJ ARO Agri. Chemestry 2022)
- :03
- :01
- :04
- :05
The equation pHp = constant is called as- (RJ ARO Agri. Chemestry 2022)
- Lime potential
- Phosphate potential
- Potassium potential
- None of the above
According to Chapman (1956), halophytes are classified as per their tolerance with salinity. Miohalophytes are well-suited to survive in a salinity range of- (RJ ARO Agri. Chemestry 2022)
- 5% NaCl
- 1.0% NaCl
- 1.5% NaCl
- 2.0% NaCl
Which two secondary silicate clay minerals have similar cation exchange capacity? (RJ ARO Agri. Chemestry 2022)
- Kaolinite-Chlorite
- Kaolinite-Illite
- Illite-Montmorillonite
- Illite-Chlorite
The radioisotopes are traced in the plant body with the help of- (RJ ARO Agri. Chemestry 2022)
- Radio hiography
- Radio autographs
- Radio nucleus
- Radio radiators
Langbeinite is a unique source of plant nutrients. It contains three essential nutrients, namely- (RJ ARO Agri. Chemestry 2022)
- N, P, K
- K, Mg, Ca
- P, K, S
- K, Mg, S
Carbon dioxide content of soil air will be highest in- (RJ ARO Agri. Chemestry 2022)
- Bare soil
- Manured soil
- Well-aggregated soil
- Cultivated soil
By the neutron moisture meter, surface soil moisture (up to 30 cm depth) measurement could not be possible because- (RJ ARO Agri. Chemestry 2022)
- Length of instrument is more
- Radiation hazard
- Range of moisture does not support in surface soil
- Due to soil properties variation
For most strongly bound by soil colloids, the sequence of cations is- (RJ ARO Agri. Chemestry 2022)
- Al > Ca > Mg > K > Na
- K > Al > Ca > Mg > Na
- Ca > Mg > K > Na > Al
- Na > K > Mg > Ca > Al
Azomethane-H is used in the determination of- (RJ ARO Agri. Chemestry 2022)
- Calcium
- Sulphur
- Boron
- Molybdenum
The term "catena" was first introduced in soil science by- (RJ ARO Agri. Chemestry 2022)
- Jenny (1941)
- Marbut (1945)
- Dokachary (1900)
- Milne (1935)
In Jenny's (1941) equation S=f(Cl,o,r,p,t...) S = f(Cl, o, r, p, t...)S=f(Cl,o,r,p,t...), the "r" stands for - (RJ ARO Agri. Chemestry 2022)
- Right time
- Topography
- Organism
- Climate
Hypokalemia in animals is caused due to the deficiency of - (RJ ARO Agri. Chemestry 2022)
- Calcium
- Magnesium
- Potassium
- Copper
In the rapid titration method (Puri, 1930) for the determination of CaCO₃, the indicator used is - (RJ ARO Agri. Chemestry 2022)
- Bromothymol blue
- Bromocresol green
- Cresol red
- Both (1) and (2)
The minimum sand content was observed in which textural class? (RJ ARO Agri. Chemestry 2022)
- Sandy loam
- Loamy-sand
- Silt clay loam
- Silt loam
The pF value of heavy soils at field capacity is - (RJ ARO Agri. Chemestry 2022)
Increase in concentration of a pollutant in the food chain is known as - (RJ ARO Agri. Chemestry 2022)
- Biomagnification
- Bioaccumulation
- Biomethylation
- Eutrophication
Among the various essential nutrients, maximum nutrients come in which period of the periodic table of the elements? (RJ ARO Agri. Chemestry 2022)
- Second
- Third
- Fourth
- Fifth
If the Na⁺/(Cl⁻ + SO₄²⁻) ratio is <1 and the pH of the saturated soil paste (pHₛ) is <8.2, the soil is designated as - (RJ ARO Agri. Chemestry 2022)
- Saline
- Sodic
- Acidic
- Saline-sodic
During the extraction of micronutrient cations by the DTPA method (Lindsay and Norvell, 1978), how much TEA is protonated? (RJ ARO Agri. Chemestry 2022)
- %
- %
- %
- %
In Kjeldahl digestion of soil for N determination, K₂SO₄ is used to - (RJ ARO Agri. Chemestry 2022)
- Increase the temperature of digestion
- Break the triple bond of Nitrogen
- Catalyze the reaction
- Convert NH₃ to NO₂
For district-level planning by semi-detailed survey, the distance between field observations should be - (RJ ARO Agri. Chemestry 2022)
- meters
- meters
- meters
- meters
Molybdenum is required by plants because it is a cofactor for - (RJ ARO Agri. Chemestry 2022)
- Cytochrome oxidase
- Phosphatase
- Nitrite reductase
- Nitrate reductase
Commercial grade montmorillonite is also available in the market as - (RJ ARO Agri. Chemestry 2022)
- Bentonite
- Beidelline
- Saponite
- Nontronite
Who introduced the concept of nutrient index value to describe the fertility status of soil? (RJ ARO Agri. Chemestry 2022)
- Havlin et al.
- Parker et al.
- Takkar et al.
- Sakal et al.
Among the various micronutrients, molybdenum comes in which period of the periodic table of the elements? (RJ ARO Agri. Chemestry 2022)
- II Period
- III Period
- IV Period
- V Period
Among the following, which one is the paracrystalline aluminosilicate mineral? (RJ ARO Agri. Chemestry 2022)
- Opaline
- Imogolite
- Chlorite
- Illite
For the preparation of 2 liters of 1N potassium dichromate solution, how much quantity of chemical is needed? (RJ ARO Agri. Chemestry 2022)
- gm
- gm
- gm
- gm
For the determination of half-life of radioactive materials, the instrument used is - (RJ ARO Agri. Chemestry 2022)
- Mass spectrometry
- Neutron scattering meter
- Geiger Muller counter
- TOC analyzer
Potassium constitutes how much percent of the earth's crust? (RJ ARO Agri. Chemestry 2022)
- %
- %
- %
- %
Most fertile soils developed due to transportation and deposition of parent material, is called as - (RJ ARO Agri. Chemestry 2022)
- Alluvium
- Colluvium
- Lacustrine
- Aeolian
According to land capability classification, the class VI denoted by the color on the map is - (RJ ARO Agri. Chemestry 2022)
- Dark grey
- Green
- Yellow
- Orange
Mineralization of soil sulfur occurs when the C:S ratio of organic matter is - (RJ ARO Agri. Chemestry 2022)
- >200:1
- <200:1
- :01:00
- <300:1
The examples of isotopes are – (RJ ARO Agri. Chemestry 2022)
- ₁₉K₃₉ ₁₉K₄₀ ₁₉K₄₁
- ₁₈Ar₄₀ ₁₉K₄₀ ₈₂Pb₂₁₀
- ₁H₂ ₂He³ ₂He₄
- ₈O₁₆ ₁₈Ar₃₈ ₂He₃
The approximate persistence of Benzene Hexachloride (BHC) in soil is - (RJ ARO Agri. Chemestry 2022)
- years
- years
- years
- years
In neutron scattering method, fast-moving neutrons emission radioactive source is - (RJ ARO Agri. Chemestry 2022)
- Americium-Beryllium
- Lithium-Radium
- Aluminum-Lithium
- Titanium-Beryllium
When weathering of Mica into secondary minerals takes place, the CEC will be? (RJ ARO Agri. Chemestry 2022)
- Increased
- Decreased
- No change
- Uneven change
Incineration is - (RJ ARO Agri. Chemestry 2022)
- heating of contaminated soil to make or reduce toxic compounds
- acidification of crop residues
- injecting air into contaminated soil
- burning of waste at very high temperatures
Organism most tolerant to soil moisture stress is - (RJ ARO Agri. Chemestry 2022)
- Fungi
- Bacteria
- BGA
- Actinomycetes
Among the three fractions of Humus, i.e. Humic acid, Fulvic acid and Humin, which fraction is maximum in vertisols? (RJ ARO Agri. Chemestry 2022)
- Humin
- Humic acid
- Gray fulvic acid
- Fulvic acid
In Munsell soil color chart the Chroma number ranges from (RJ ARO Agri. Chemestry 2022)
- Aug
- Oct
White bud of maize disease is caused due to deficiency of (RJ ARO Agri. Chemestry 2022)
- Zinc (Zn)
- Manganese (Mn)
- Iron (Fe)
- Copper (Cu)
The interaction processes of minerals with organic compounds are called as - (RJ ARO Agri. Chemestry 2022)
- Adsorption
- Desorption
- Chelation
- Retention
In mineralizable N determination mixed indicator is prepared by (RJ ARO Agri. Chemestry 2022)
- Methyl red and bromocresol blue
- Methyl orange and bromocresol green
- Methyl red and bromocresol green
- Methyl yellow and bromocresol purple
For normal growth of soil micro-organisms, the ODR values (gm/cm/min) should be at least (RJ ARO Agri. Chemestry 2022)
- x10^-8
- x10^-8
- x10^-8
- x10^-8
The most important cementing agent in laterite soil is (RJ ARO Agri. Chemestry 2022)
- Silt particles
- Calcium carbonate
- Organic matter
- Hydrous oxides of Fe & Al
Hymatomelanic acid is soluble in (RJ ARO Agri. Chemestry 2022)
- Alkali and Alcohol
- Acid and Alkali
- Alkali and Hot water
- Hot and Cold water
Fertilizers containing CT ions are not suitable for which crops? (RJ ARO Agri. Chemestry 2022)
- Wheat
- Potato
- Soybean
- Sugarcane
Which is the correct order of fertilizers on the basis of their acidifying capacity expressed in terms of kg CaCO3/kg N in fertilizer? (RJ ARO Agri. Chemestry 2022)
- Urea > Ammonium nitrate > Ammonium sulphate > Ammonium sulphate, ammonium nitrate
- Ammonium sulphate > Ammonium sulphate, ammonium nitrate > Urea > Ammonium nitrate
- Ammonium nitrate > Urea > Ammonium sulphate, ammonium nitrate > Ammonium sulphate
- Ammonium sulphate, ammonium nitrate > Urea > Ammonium sulphate > Ammonium nitrate
Pumice is which type of rock, having very light weight and specific gravity is lower than water? (RJ ARO Agri. Chemestry 2022)
- Igneous rock
- Sedimentary rock
- Metamorphic rock
- All of the above
Size of K+ ion is similar to that of - (RJ ARO Agri. Chemestry 2022)
- Zn2+
- Na+
- NH4+
- Mg2+
National Remote Sensing Agency was established in (RJ ARO Agri. Chemestry 2022)
Which scale is used in detailed soil survey? (RJ ARO Agri. Chemestry 2022)
- :10,000
- :8,000
- :5,000
- All of the above
Which technique is used for quantitative analysis of Humic substances? (RJ ARO Agri. Chemestry 2022)
- IR Spectroscopy
- UV Spectroscopy
- NMR Spectroscopy
- ESR Spectroscopy
In clay minerals identification, X-ray Diffraction analysis (XRD) is a (RJ ARO Agri. Chemestry 2022)
- destructive method
- semi-destructive method
- non-destructive method
- None of the above
In CaCl2-extractable Sulphur determination (Williams & Steinberg's, 1969 method), the chemical used for turbidity development is (RJ ARO Agri. Chemestry 2022)
- Barium chloride
- Gum acacia
- Potassium sulfate
- Calcium chloride
In determination of Phosphorus, phosphate-ammonium molybdate does undergo which of the following processes to produce blue color? (RJ ARO Agri. Chemestry 2022)
- Oxidation
- Reduction
- Solubilization
- Precipitation
Emitted color for sodium is (RJ ARO Agri. Chemestry 2022)
- Violet
- Red
- Yellow
- Orange
In neutralization reaction, the reactivity of phenolphthalein indicator works at pH range of- (RJ ARO Agri. Chemestry 2022)
- 8.6
- 7.6
- 8.0
- 10.0
In the pressure plate apparatus, the ceramic plates are unable to measure pressure beyond- (RJ ARO Agri. Chemestry 2022)
- bar
- bar
- bar
- bar
The conversion factor to convert 9% P to %P₂O₅ is- (RJ ARO Agri. Chemestry 2022)
Diammonium phosphate requirement for supplying 45 kg N and 115 kg P₂O₅ to one hectare groundnut crop is- (RJ ARO Agri. Chemestry 2022)
- kg
- kg
- kg
- kg
As pH drops from 5.5 to 4.5, dissolved Al is how many times greater at pH 4.5 than at pH 5.5? (RJ ARO Agri. Chemestry 2022)
- times
- times
- times
- times
The electrical conductivity of 0.01N potassium chloride solution at 25°C is - (RJ ARO Agri. Chemestry 2022)
- dS/m
- dS/m
- dS/m
- dS/m
The maximum area of soils of Rajasthan comes in the soil orders of- (RJ ARO Agri. Chemestry 2022)
- Alfisols - Vertisols
- Alfisols - Inceptisols
- Aridisols - Entisols
- Aridisols - Inceptisols
Which type of soil auger is used in soils having a higher amount of clay content? (RJ ARO Agri. Chemestry 2022)
- Screw type auger
- Tube auger
- Dutch auger
- Post hole auger
The primary inorganic form of phosphorus in mineral soils is- (RJ ARO Agri. Chemestry 2022)
- Iron and aluminum phosphate minerals
- Apatite
- Augite
- Anorthite
The residence time of N₂O in the atmosphere is approximately- (RJ ARO Agri. Chemestry 2022)
- days
- weeks
- months
- years
Chemically anhydrous aluminosilicates of potassium, sodium, and calcium found in- (RJ ARO Agri. Chemestry 2022)
- Feldspar
- Silicates
- Zeolites
- Pyrophyllite
What is the theme of the World Health Day 2022? (RJ ARO Agri. Chemestry 2022)
- Support Nurses and Midwives
- Our planet, our health
- Health equity and its determinants
- Invest in our planet
Conversion of calcium sulfate to gypsum is a process of- (RJ ARO Agri. Chemestry 2022)
- Hydrolysis
- Hydration
- Oxidation
- Solution
Which one of the following microorganisms is responsible for maximum nutrient cycling in the soil? (RJ ARO Agri. Chemestry 2022)
- Fungi
- Algae
- Bacteria
- Actinomycetes
Among the 1:1 clay minerals, the most widely distributed one in Indian soils is- (RJ ARO Agri. Chemestry 2022)
- Halloysite
- Kaolinite
- Dickite
- Nacrite
The neutralizing values of various liming materials in decreasing order are - (RJ ARO Agri. Chemestry 2022)
- CaSiO₃ > CaMg(CO₃)₂ > Ca(OH)₂ > CaO
- Ca(OH)₂ > CaO > CaMg(CO₃)₂ > CaSiO₃
- CaO > Ca(OH)₂ > CaMg(CO₃)₂ > CaSiO₃
- CaMg(CO₃)₂ > CaSiO₃ > CaO > Ca(OH)₂
If soil A is having a higher buffering capacity than soil B, then - (RJ ARO Agri. Chemestry 2022)
- Soil A will require more lime than soil B for pH increment
- Soil A will require less lime than soil B for pH increment
- Both the soils will require the same amount of lime
- None of the above
Who is the Father of Indian Soil Science and Agricultural Chemistry? (RJ ARO Agri. Chemestry 2022)
- V.V. Dokuchaev
- J.W. Leather
- J.V. Liebig
- J. Thomas
The ratio or fraction between the size of an object on a map and its size in the real world is - (RJ ARO Agri. Chemestry 2022)
- Map
- Resolution
- Slope
- Scale
The specific surface area (m²/g) of montmorillonite clay is in the range of - (RJ ARO Agri. Chemestry 2022)
In India, the National Bureau of Soil Survey and Land Use Planning (NBSS & LUP) was established in the year? (RJ ARO Agri. Chemestry 2022)
The examples of amphibole minerals are - (RJ ARO Agri. Chemestry 2022)
- Augite, actinolite, tremolite
- Augite, diopside, enstatite
- Hornblende, actinolite, enstatite
- Hornblende, tremolite, actinolite
In the determination of available K by neutral normal ammonium acetate (1N NH₄OAc, pH 7.0) solution, the proportion of soil : solution ratio is - (RJ ARO Agri. Chemestry 2022)
- :02
- :04
- :05
- :10
In the determination of Ca+Mg by EDTA method, which of the following indicators is used in titration of Ca alone? (RJ ARO Agri. Chemestry 2022)
- Phenolphthalein
- Diphenylamine
- Eriochrome Black T
- Calcon
The new Integrated Watershed Development Programme (IWDP) was launched in the year - (RJ ARO Agri. Chemestry 2022)
The Residual Sodium Carbonate (RSC) of irrigation water containing carbonate, bicarbonate, calcium, and magnesium ions as 15, 20, 18, and 12 meq/L, respectively, will be - (RJ ARO Agri. Chemestry 2022)
- meq/L
- meq/L
- meq/L
- meq/L
To obtain percent organic matter from percent organic carbon, a multiplying factor of 1.724 is called as - (RJ ARO Agri. Chemestry 2022)
- Bery factor
- Van-half factor
- Van-Bemmelen factor
- Wilkinson factor
The relationship between Anion Exchange Capacity (AEC) and soil pH is as- (RJ ARO Agri. Chemestry 2022)
- AEC decreases when pH decreases
- AEC increases when pH decreases
- AEC increases when pH increases
- No effect of pH on AEC
Which of the following is not a source of greenhouse gases? (RJ ARO Agri. Chemestry 2022)
- A wind turbine
- Fertilizer industry
- A coal-fired power plant
- A sport utility vehicle
Which is the boron-containing mineral? (RJ ARO Agri. Chemestry 2022)
- Chalcopyrite
- Tourmaline
- Pyrite
- Serpentine
The organic P is mostly located in which fractions of the soil humus? (RJ ARO Agri. Chemestry 2022)
- Humic acid
- Fulvic acid
- Humin
- Hymetomelmic acid
When the composition of the upper 5 km of the Earth's crust is studied, the maximum part is formed from which rocks? (RJ ARO Agri. Chemestry 2022)
- Sandstone
- Limestone
- Granite
- Shale
Available K is converted into K₂O by multiplying with - (RJ ARO Agri. Chemestry 2022)
Hartig net is present in - (RJ ARO Agri. Chemestry 2022)
- Ectotrophic mycorrhizae
- Endomycorrhizae
- BGA
- Rhizobium