1) The organic matter of soils is ordinarily obtained by multiplying the organic carbon content by: a. 1.52 b. 1.62 c. 1.72 d. 1.82
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2) The organism, which can survive at the temperature 10 - 15?C, is called: a. Psychrophylic b. Mesophytic c. Thermoduric d. Thermophilic
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3) The P2O5 content is P in the plough layer of 1 ha of soil containing 0.1%. P2O5 is: a. 430 kg b. 860 kg c. 1290 kg d. 1500 kg
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4) The pattern of occurrence of various soil taxonomic units on the detailed map is called: a. Soil complex b. Soil association c. Soil variant d. Soil phase
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5) The percentage of soil water held with water potential - 15 bars is called as: a. Hygroscopic coefficient b. Wilting point c. Field capacity d. None of the above
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6) The pH of a solution, containing 1 x 10-7 gm ion/ml. will be: a. 6 b. 7 c. 8 d. 9
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7) The phosphate potential is denoted as: a. 1/2 p Ca + pH2PO4 b. PH - 1/2 p Ca c. RT in K+/?Ca++ d. p Ca + pH2PO4
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8) The plant nutrient when supplied in excess prolongs the growing period and delay crop maturity is: a. Iron b. Phosphorus c. Nitrogen d. Potassium
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9) The porosity will be more in soils having particle size of: a. 0.005 mm b. 0.02 mm c. 2.0 mm d. 0.002 mm
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10) The positive and high value of redox potential indictes: a. Reducing conditions b. Strong oxidizing conditions c. Equally reducing and oxidizing conditions d. None of these
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11) The presence of autotrophic mycorrhiza enhances the uptake of nutrients in general, but particularly of: a. Iron b. Molybdenum c. Phosphrous d. Nitrogen
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12) The prime objective of conservation tillage is: a. Removal of plant residues b. Complete retention of plant residues c. Partial retention of plant residues d. None of these
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13) The principal cation that affects the availability/fixation of phosphorus in alkali soils is: a. Ca and Mg b. Na and K c. Fe and Al d. None of the above
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14) The process of ammonification is often ______ by the use of pesticides: a. Harmed b. Harmed c. Not affected d. None of these
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15) The process responsible for the formation of sodic soil is: a. Salinization b. Alkalinization c. Podzalization d. Calcification
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16) Which of the following rotations is likely to leave soil richer in organic matter: a. Continuous sorghum b. Continuous maize c. Continuous Oats d. Maize-oats-clovers
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17) Zinc sulphate is generally taking more production under: a. Saline soil b. Acid soil c. Water logged soils d. Alkali soils
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18) The quantity of solid phase phosphorus that acts as reserve is often referred to as: a. Intensity factor b. Quality factor c. Quantity factor d. None of these
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19) The quantity of urea needed for applying 115 kg nitrogen to maize will be (approx): a. 100 kg b. 250 kg c. 100 kg d. 150 kg
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20) The ratio of thermal conductivity and heat capacity is known as: a. Thermal diffusivity b. Heat capacity c. Thermal capacity d. None of these
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21) The relative amounts of air and water in the pore spaces: a. Always remain constant b. Fluctuate continuously c. Half filled and half empty d. All of the above
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22) The relative proportions of sand silt and clay n the soil is known as: a. Soil structure b. Soil consistence c. Soil texture d. None of the above
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23) The representtion of surface feature on map and their identification is called: a. Soil legand b. Soil map c. Soil variant d. None of them
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24) The residual effect of ammonical nitrogenous fertilizer in soil is: a. Alkaline b. Neutral c. Acidic d. None of the above
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25) The rice crop tolerates submergence because: a. The plant does not need O2 b. The plant has mechanism to transport O2 through leaves c. Bacteria keep the rhizosphere oxidised d. O2 penetrating to root zone through air movement is sufficient
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26) The rock 'Quartzite' is a: a. Sedimentary rock b. Igneous rock c. Metamorphic rock d. None of these
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27) The rock "Granite" is a: a. Sedimentary rock b. Metamorphic rock c. Igneous rock d. None of above
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28) The rock, which is formed by sedimentation of primary rock, is called: a. Igneous rock b. Metamorphic rock c. Sedimentary rock d. None of these
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29) The rock, which is formed under high temperature and pressure and by sudden geological tectonic movement, is called: a. Igneous rock b. Sedimentary rock c. Metamorphic rock d. None of these
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30) The saline soil can be managed by: a. Addition of gypsum b. Addition of lime c. Addition of pyrite d. Leaching of salts
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31) The sodicity of water can be expressed by: a. ECE b. SAR c. ESP d. All of the above
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32) The soil layer of maximum leaching is indicated by the symbol a. A1 b. A2 c. A2 d. B2
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33) The soil solum includes: a. A horizon b. B horizon c. A and B Horizon d. None of the above
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34) The soil temperature under field conditions can be altered by suitable cultural practice such as: a. Irrigation b. Mulching c. Tillage d. All of the above
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35) The soils of ______ zones can supply adequate potassium for many years even under irrigations: a. Temperature b. Humid c. Arid d. Sub-tropical
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36) The species of Rhizobium present in the root nodules of soyabean is: a. R. japonicum b. R. leguminosarum c. R. trifolii d. R. phasedi
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37) The succulence and lodging in plants is due to 'excessive' application of: a. Zinc b. Phosphorus c. Hydrogen d. Potassium
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38) The sufficiency limit of iron is normally between: a. 10-45 ppm b. 50-150 ppm c. 350-400 ppm d. 500-750 ppm
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39) The systematic examination, description, classification and mapping of soil of an area is known as: a. Soil survey b. Soil mapping c. Soil classification d. All of the above
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40) The technique used for minimizing the loss of nitrogen in paddy fields comprises: a. Use of neem cake b. Use of pre-incubated urea c. Use of mud ball d. All of these
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41) The tendency of the young upper leaves to remain as the lower leaves yellow or die is an indication of nitrogen: a. Immobility b. Mobility c. Stability d. None of the above
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42) The texture of surface soil or surface horizon is called: a. Soil phase b. Soil type c. Soil variant d. None of them
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43) The tropical soils high in hydrous oxides of iron and aluminium embody ______ to torrential rains: a. Susceptibility b. Resistance c. Both of these d. None of these
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44) The unconsolidated material on the underlying rock is called: a. Regolith b. Soil c. Solum d. Earth
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45) The unit of fertilizer or any other growth factor which is necessary to produce the yield which in 50% of maximum possible yield is called: a. Optimum unit b. Standard unit c. Baule unit d. Fertilizer unit
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46) The value above ______ ppm is associated with boron toxicity: a. 150 b. 200 c. 250 d. 300
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47) The water held with a water potential greater than. 1/3 bar is known as: a. Field capacity b. Gravitational water c. Available water d. Unavailable water
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48) The weathered material transported by means of waters and deposited in river basins are termed as: a. Alluvial b. Marine c. Lacustrine d. None of above
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49) The weathering causes: a. Disintegration and decomposition of rocks b. Disintegration and decomposition of rocks and minerals c. Both (a) & (b) d. None of these
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50) The zinc deficiency in rice causes disease: a. Khaira b. Bacterial leaf streak c. Bacterial leaf blight d. Sheath blight
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