JNKVV & RVSKVV PhD Soil Science Entrance Exam 2024

JNKVV & RVSKVV PhD Soil Science Entrance Exam 2024

Q1. Colloidal oxides of Fe and Al in Alfisols leads to the formation of ?

• Surface crusting
• Fluffy soil
• Excessively permeable soil
• Shallow soil

Answer

Q2. Urease enzyme converts _____ to __________.?

• Ammonium to Nitrite
• Nitrite to nitrate
• Nitrate to Nitrogen
• Urea to ammonium

Answer

Q3. The marble is an example of

• Metamorphic rock
• Igneous rock
• Sedimentary rock
• Soil minerals

Answer

Q4. Estimate the leaching requirement of an irrigation water having electrical conductivity of 3 dSm-1 when electrical conductivity of drainage water is 8 dSm-1.?

• 15 percent
• 75 percent
• 5 percent
• 10 percent

Answer

Q5. Ammonia volatilization will be highest in acid soils when _________ fertilizer is applied.?

• Ammonium sulphate
• Urea
• Ammonium nitrate
• Ammonium chloride

Answer

Q6. In submerged soil, due to puddling the thermal conductivity ————– and hydraulic conductivity————, respectively?

• Increases, Increases
• Decreases, Increases
• Increases, Decreases
• Decreases, Decreases

Answer

Q7. If the H+ ion concentration is 0.000001 then the pH is ——–?

• 4
• 9
• 5
• 6

Answer

Q8. Which of the following is frequently used as an index for salinization hazard?

• SAR
• EC
• RSC
• ESP

Answer

Q9. Energy required to detach one electron from neutral atom is ————-?

• polarization
• electronegativity
• Ionization
• Absorption

Answer[/bg_collapse]

Q10. As the Leaching Fraction increases, the concentration of salts in the root zone and the electrical conductivity (EC) ——?

• Decreases
• Increases
• Does not change
• Remains the same

Answer

Q11. Which of these macronutrients is associated with stomatal opening, disease resistance and water relations?

• Sulphur
• Nitrogen
• Phosphorus
• Potassium

Answer

Q12. For conversion of percent P to percent P2O5, percent P is multiplied with ———–?

• 29
• 3
• 99
• 25

Answer

Q13. Natural abundance of Nitrogen -15 isotope is?

• 04 percent
• 36 percent
• percent
• 6 percent

Answer

Q14. The requirement of phosphorus for barnyard millet in a red laterite soil is 20 kg. How much quantity of diammonium phosphate is required to meet out this?

• 101
• 5
• 105
• 8

Answer

Q15. Nitrification occurs fastest under which of the following conditions?

• Aerobic soils, pH 8
• Water logged soils, pH 6
• Aerobic soils, pH 6
• Water logged soils, pH 8

Answer

Q16. ——— micronutrient is needed to convert inorganic phosphates to organic forms in the plant?

• Molybdenum
• Zinc
• boron
• copper

Answer

 

Q17. Which material, if applied at the same rate, would lower the pH of the soil most significantly?

• Potassium sulfate
• Gypsum
• Elemental S
• Potassium chloride

Answer

Q18. Selenium is ——————– element?

• a Beneficial
• an Atmospheric
• an Essential
• a Functional

Answer

Q19. The approach developed by Waugh and Fits largely meant for less mobile nutrients like P and some micronutrients is —————?

• Deductive
• Nutrient indexing
• DRIS
• Critical limit

Answer

Q20. The clay mineral having highest cation exchange capacity is?

• Kaolinite
• Vermiculite
• Illite
• Chlorite

Answer

Q21. log (A – Y) = log A – c1b – cx is developed by ————?

• Mitscherlich (1929)
• Bray et al. (1954)
• Mitscherlich (1909)
• Bray et al. (1956)

Answer

Q22. The land capability classes not suitable for cultivation are?

• III – IV
• I – IV
• I – II
• V -VIII

Answer

Q23. The essentiality of Boron(B) was given by ———————?

• Brownell (1957)
• Wood (1957)
• Sommer and Lipman (1926)
• Warrington (1923)

Answer

Q24. Gypsum requirement is ———–?

• ESP (initial) – ESP (final) XCEC / 100
• ESP (initial) – ESP (final) XCEC/1000
• ESP (final)–ESP (initial)XCEC / 100
• ESP (final) – ESP (initial)XCEC/1000

Answer

Q25. The pH at which a particular molecule or surface carries no net electrical charge is ——–?

• Alkaline
• Acidic
• Isoelectric point
• Neutral

Answer

Q26. An Ideal bulk density for better root growth in clay textured soil is —————–?

• >1.10 Mg M^-3
• <1.10 Mg M^-3
• <1.30 Mg M^-3
• >1.30 Mg M^-3

Answer

Q27. When the granular structure is very porous, it is termed as ——————?

• Granular
• Single grain
• Crumb
• Loose

Answer

Q28. The particle density of a mineral soil is normally in the range of?

• 75 – 2.90 Mg / m³
• 60 – 2.70 Mg / m³
• 30 – 1.50 Mg / m³
• 00 – 2.40 Mg / m³

Answer

Q29. The best suitable size distribution of soil aggregates for irrigated agriculture is —————-?

• >15 mm
• >5 mm
• >20 mm
• >25 mm

Answer

Q30. Soil compaction induces deficiencies of __________ nutrients.?

• N and K
• N and S
• N and P
• N and Mg

Answer

Q32. __________ is an expansive soil.?

• Oxisol
• Mollisol
• Vertisol
• Spodosol

Answer

Q33. Matric and osmotic potentials are ___________and reduce the free energy level of the soil water.?

• Negative
• Positive
• High
• Equal

Answer

Q34. At __________ the soil contains the maximum amount of capillary water.?

• Permanent wilting point
• Field capacity
• Oven dry Point
• Saturated level

Answer

Q35. The negative potentials in soil water are referred as __________.?

• pF
• Energy
• Strength
• Tension

Answer

Q36. Out of the total solar energy reaching the earth, only __________ percent is used by the soil to warm it.?

• 10
• 15
• 5
• 20

Answer

Q37. The movement or transfer of heat in soil takes place mainly by __________.?

• Vibration
• Convection
• Conduction
• Diffusion

Answer

Q38. Exchange of O₂ and CO₂ between soil and atmosphere mainly by __________.?

• Mass Flow
• Diffusion
• Convection
• Conduction

Answer

Q39. The soil water which is not usually used by plant is?

• Hygroscopic and gravitational water
• Hygroscopic and capillary water
• Gravitational and capillary water
• Only hygroscopic water only

Answer

Q40. Soil particle analysis make use of ________________ law?

• Poiseuille’s law
• Darcy’s law
• Fick’s law
• Stoke’s law

Answer

Q41. Mineralization of Sulphur takes place at C:S ratio of?

• 100 : 1 ratio
• 300 : 1 ratio
• 200 : 1 ratio
• 30:1 ratio

Answer

Q42. Determination of potential difference between the pair of electrodes placed in the sample solution is known as?

• Conductometry
• Potentiometry
• Redox titrations
• Phosphorimetry

Answer

Q43. CEC of montmorillonite clay is—————–.?

• 10 cmol (p+) kg^-1
• 300 cmol (p+) kg^-1
• 30 cmol (p+) kg^-1
• 70 cmol (p+) kg^-1

Answer

Q44. STCR concept was proposed by ____________.?

• Krishna Murthy
• Rama Murthy
• Cate and Nelson
• N.Acharya

Answer

Q45. Separating complex mixtures of compounds having similar polarity like amino acids is done with —————-?

• Chromatography
• Spectroscopy
• Flame photometry
• Nephelometry

Answer

Q46. The instrument which measures mass-to-charge ratio of molecules using electric and magnetic fields is?

• Mass spectrometry
• FTIR
• HPLC
• NMR

Answer

Q47. The most common sequence of alteration mechanism of micas throughout pedogenesis is ————————-.?

• Montmorillonite, Intermediate stage, Vermiculite, Mica
• Mica, Montmorillonite, Intermediate stage, Vermiculite
• Mica, Intermediate stage, Vermiculite, Montmorillonite
• Vermiculite, Mica, Intermediate stage, Montmorillonite

Answer

Q48. Molar ratio for montmorillonite dominant soil clay is ——————-?

• equal to 2.0
• 0-2.0
• less than 2.0
• more than 2.0

Answer

Q49. Basic alluvium or aeolian materials produce ——————–?

• Fine-textured cracking-clay soils
• Light-textured soils
• Deep fine textured soils
• Fine to coarse-textured soils

Answer

JNKVV & RVSKVV PhD Soil Science Entrance Exam 2024

Q50. When the texture is silty, the transportation of soil is called as——————?

• Loess
• Aeolian
• Glacial
• Alluvial

Answer

Q51. ————— soils are temporary and persist only until the chemical decomposition becomes active under the influence of climate and vegetation.?

• Ectodynamomorphic soils
• Endodynamomorphic soils
• Colluvial soils
• Alluvial soil

Answer

Q52. Undulating land surface have the slope percentage of ——————-?

• 2 – 5
• 15 – 30
• 5 – 10
• 10 to 15

Answer

Q53. In tropical regions, the rate of weathering proceeds ————- faster than in temperate regions and ————— faster than in arctic.?

• three times, nine times
• Five times, three times
• three times, Five times
• nine times, three times

Answer

Q54. Lowest category of soil taxonomy is ——————-?

• Soil phase
• Soil series
• Soil type
• Soil association

Answer

Q55. Scanning across the surface of the TLC plate can be done with a __________________?

• Spectro-densitometer
• Spectrometer
• HPLC
• GLC

Answer

Q56. Carbohydrates constitute ———– of organic matter in soil?

• 5-10 percent
• 10-20 percent
• 5-25 percent
• 20-50 percent

Answer

Q57. When the flocculation increases, zeta potential will __________.?

• increase initially, then decreases
• decreases
• increases
• No change observed

Answer

Q58. Lignin pathway of humus formation predominates in ———–?

• Well drained soil
• Red soil
• Black soil
• Poorly drained soils

Answer

Q59. The fraction of humic substances soluble in water at all pH is ———-?

• Humin
• Fulvic acid
• Humic acid
• Hymato-melanic acid

Answer

Q60. The present ratio of N: P : K fertilizer use in India is?

• 7 : 3.1 : 1:: N : P : K
• 8:2.8 :1:: N : P : K
• 8: 4.6 : 1 :: N : P : K
• 4 : 2: 1 :: N : P : K

Answer

Q61. Biological N fixation is done by ————?

• Rhizobium
• Phosphobacteria
• Nitrobacter
• Pseudomonas

Answer

Q62. Biochemical reduction of nitrate to nitrite is ———-?

• Denitrification
• Nitrification
• Volatilization
• Immobilization

Answer

Q63. Which one is the theoretical value dependent upon the reaction equation while the end point of a titration is based upon experimental observation?

• Iso-electric point
• Neutralizing point
• Equivalence point
• Electrical point

Answer

Q64. A decrease in mineral N with time indicates ———-?

• Volatilization
• Leaching
• Mineralization
• Immobilization

Answer

Q65. The CO2 is converted into organic C by ———— organisms?

• Saprophytes
• Photoautotrophs
• Parasites
• Heterotrophs

Answer

Q66. Which element act as detoxifying agent by neutralizing organic acids in plants?

• Magnesium
• Calcium
• Potassium
• Sodium

Answer

Q67. Phenolphthalein is colourless in acidic medium since it is in _______form?

• Quinonoid form
• Benzenoid form
• Oxidized form
• Reduced form

Answer

Q68. Element takes part in leg haemoglobin metabolism in rhizobium?

• Nickel
• Sodium
• Cobalt
• Molybdenum

Answer

Q69. Why NH4+ is the preferred N source instead of NO3- for synthesis of protein by plants?

• Energy saving
• More subject to losses
• Plant tolerates large excesses of NH4+
• Easily immobilized

Answer

Q70. Movement of mobile nutrients into the plants through transpiration pull of water is known as _____?

• Cation exchange
• Root interception
• Diffusion
• Massflow

Answer

Q71. Heroin is the ______ from opium, used as pain killer and powerful addictive.?

• Morphine
• Dimorphine
• Codeine
• Nicotine

Answer

Q73. A pH meter measures?

• Active acidity
• exchageable acidity
• residual acidity
• Total acidity

Answer

Q74. Gypusm requirement was given by?

• Shoemaker
• Schoonover
• Russell
• Hillel

Answer

Q75. Under submerged conditions pH of the soil becomes?

• acidic
• basic
• neutral
• no change

Answer

Q76. Rhizobium trifoli belongs to?

• Pea group
• Soybean group
• Alfalfa group
• Clover group

Answer

Q77. Identify the method to estimate root CEC?

• Potentiometry
• Electrodialysis
• Conductometry
• Chromatography

Answer

Q78. Find out the organic matter percentage of the soil, if 2 ml of 1N K2Cr2O7 solution was consumed for oxidation of organic C present in 1 gram of soil.?

• 3
• 6
• 1
• 5

Answer

Q79. Find out the micronutrient that is most strongly bound to organic matter.?

• Cu
• Fe
• Zn
• B

Answer

Q80. Identify the heat transfer by molecular motion.?

• Radiation
• Mass flow
• Convection
• Conduction

Answer

Q81. Spot the type of humus found in coniferous forests.?

• Mor
• Mull
• Moder
• Muck

Answer

Q82. Identify the most used detector in Atomic Absorption Spectrometer?

• RFD
• PMT
• TCD
• Chiral

Answer

Q83. Example for sulphur oxidizing bacteria?

• Desulfovibrio
• Thiobacillus thioxidans
• Nitrosomonas
• Desulphotomaculum

Answer

Q84. Identify the soil available nutrient for which ammonium oxalate (pH=3.3) is used as extractant for its estimation.?

• Boron
• Iron
• Zinc
• Molybdenum

Answer

Q85. Percentage of methane in biogas?

• 0-10
• 50-80
• 15-20
• 20-25

Answer

Q86. Pick out the theory describe repulsive energies and forces.?

• DLVO
• Helmholtz
• Stern
• Gouy- Chapman

Answer

Q87. Which of the following microbe is responsible for P solubilization?

• Azospirillum
• Mycorrhiza
• Rhizobium
• Phosphobacteria

Answer

Q88. Name the instrument used to detect the components based on the selective affinity of components towards the adsorbent materials.?

• Flame photometer
• Gas Chromatograph
• ICP-MS
• AAS

Answer

Q89. Identify the electron donor in the process of Nitrogen fixation.?

• NADH
• Ferridoxin
• Flavodoxin
• Ubiquinone

Answer

 

Q90. Find out the formula for activity ratio (ARe^K)

• Activity of Ca²⁺ and Mg²⁺/Activity of K⁺
• Activity of K⁺ / Activity of Ca²⁺ and Mg²⁺
• (Activity of K⁺) (Activity of Ca²⁺ and Mg²⁺)
• (Activity of Ca²⁺ and Mg²⁺)(Activity of K⁺)

Answer

Q91. Permissible level of NO₃^– in drinking water is?

• 10 milligrams per liter
• 20 milligrams per liter
• 45 milligrams per liter
• 1 milligrams per liter

Answer

Q92. State the degree of unsaturation in fats and oils.

• Iodine number
• Acid value
• Polenski value
• Saponification number

Answer

Q93. Which denotes the logarithm of the height of water column?

• pH scale
• EH
• 9
• pF scale

Answer

Q94. Name the variable that indicate dominant spectral soil colour.?

• Value
• Hue
• Chroma
• Albedo

Answer

Q95. Identify the apparatus used for soil moisture measurements up to 1 atm.>?

• Pressure membrane
• Gypsum block
• Pressure plate
• Neutron probe

Answer

Q96. Spot the principle employed in neutron moisture meter.?

• Measurement of thermalised neutrons
• Measurement of photons
• Measurement of fast neutrons
• Measurement of beta particle

Answer

Q97. Name the soil order where sesquioxide clays are predominant.?

• Ultisols
• Andisols
• Oxisols
• Inceptisols

Answer

 

Q98. Source of P fertilizer that is water insoluble but citrate soluble?

• Rock Phosphate
• Basic Slag
• Bone Meal
• Triple Calcium Phosphate

Answer

Q99. Who suggested the first national nutrient balance?

• Johnston and Cameron
• Conway and Pretty
• Smaling and Braun
• Van der Pol

Answer

Q100. State the type of nutrient budget widely used in policy analysis?.

• Gate budgets
• Surface budgets
• System budgets
• Surface budgets and System budgets

Answer

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