soil science Mcqs
301. C:N ratio of microorganism:
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A. 15:1-20:1

B. N0ne of the above

C. 10:1-15:1

D. 4:1-8:1

302. Transportation & cementation of primary rocks:
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A. All of the above

B. Sedimentary rocks

C. Secondary rocks

D. Aqueous rocks

303. Who consider the various properties of soil in relation to plant production?
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A. Soil chemist

B. Pedologist

C. agronomist

D. Edaphologists
304. The soils most prone to structural crusts are those which are higher in_________?
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A. Clay content

B. Sodium content

C. Silt content

D. Both A & B
305. In Balochistan, deserts also exists in _________, which supoorts wind erosion excluding rocky mountains:
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A. Desert of Kharan

B. Noshki

C. Both A & B

D. Qilla SaifUllah

306. Rhizosphere is:
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A. Area with in the roots

B. Root surface

C. An area of soil in from root surface to 10 cm

D. An area of soil in immediate vicinity around root
307. swelling clay soils, develop cracks due to greater proportion of swelling type clays:
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A. Vertisols

B. Alfisols

C. None of the above

D. Ultisols

308. The immobilization and accumulation of the eluviated constituents at some depth beneath the soil surface:________?
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A. Eluviation

B. Iluviation

C. Melanization

D. Illuviation
309. Soils that have more than 20% organic matter are termed as organic soils. These are also called:________?
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A. Peat soil

B. solonchalk soil

C. Muck soil

D. Both a and c
310. Erosion permitting and erosion resisting crops grow alternatively at right angle to the slope of the land is called as:_________?
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A. Strip planting

B. All of the above

C. Cover planting

D. Linear planting

311. Thick concordant bodies which force the overlying sediments to form dome-shaped hills are called_____________________?
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A. Batholiths

B. Dike

C. Pegmatic

D. Laccoliths
312. Who gave the equation for study of soil property ?
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A. Jenny

B. Newton

C. Ziebig

D. Neil

313. Nitrogen gases are involved in_____________________?
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A. Sleepy feelings

B. Acid rains

C. Hair disease

D. Mental disease

314. The available from of nitrogen for plant is________________?
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A. NO<sub>3</sub>

B. NH<sub>4</sub>

C. Both a & b

D. None of the above

315. Which rock is harder_________________?
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A. Sand stone

B. Sedimentary

C. Metamorphic

D. Igneous

316. Widely spread saprophytic fungi is________________________?
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A. None of the above

B. Endospore

C. Basidiomycetes

D. Ascomycetes
317. The complex fertilizer Nitrophos available in the market contains_____________________?
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A. 23%N & 23% P2O3

B. None of the above

C. 25%N & 23% P2O3

D. 46%N & 23% P2O3

318. Size of clay particle is___________________?
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A. 0.2mm

B. 0.02mm

C. 2mm

D. 0.002mm

319. The molar mass of NaCl is_____________________?
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A. 43.28

B. 50.58

C. 58.58

D. 56.58

320. Deep percolation from a soil profile is generally measured by a device known as_____________________?
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A. Hydrometer

B. Tensiometer

C. Lysimeter

D. Thermometer

321. pF unit is used for the measurement of_____________________?
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A. Negative soil water potential

B. Hydraulic conductivity

C. Hydraulic potential

D. All the above

322. Gold is___________________?
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A. Primary element

B. Native element

C. Heavy metal

D. Secondary element

323. The process of accumulation of excess quantity of nutrients in water causing O2 deficiency is known as_____________________?
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A. Eutrophication

B. Nitrification

C. Sedimentation

D. Denitrification

324. Particular matter consists of____________________?
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A. Solid and liquid

B. None of the above

C. CO2 & N

D. Solid and gases

325. Secondary air pollution is _____________________?
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A. CO3

B. HNO3

C. CO2

D. All the above
326. Organic P content in soil, by ignition method is estimated by igniting the soil at ____________________?
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A. 1000C

B. 550C

C. 250C

D. 1250C

327. How much percentage of soils of Pakistan are deficient in P______________________?
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A. 80-90

B. 60

C. 50-70

328. Biochemical reduction of nitrate to nitrite or gaseous nitrogen is called ________________________?
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A. Reduction

B. None of the above

C. Denitrification

D. Oxidation

329. The exact chemical formula of DAP fertilizer is___________________?
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A. (NH2) HPO4

B. NH4H2PO4

C. NH4H2PO4

D. Both a & c

330. The chemical formula of Hematite is_____________________?
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A. AL (OH)2

B. Fe2O3

C. Fe OOH

D. None of the above

331. Silt stones consists of grains whose size range from____________________?
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A. 0.625 mm

B. 0.004 mm

C. 0.0625 mm

D. Both b & c
332. Ligands that occur in Pakistan soils are__________________?
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A. CO3-2 SO4-2

B. SO4-2 OH

C. All the above

D. OH1 HCO2

333. Weathering is_______________________?
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A. Destructive process

B. Constructive process

C. Both a & b

D. None of the above

334. Schist is example of____________________?
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A. Stone

B. Name of mountain

C. None of the above

D. Metamorphic rock
335. The EC: SAR and RSC values suggested by WAPDA for 3rd class irrigation water(C,S,R,) are____________________?
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A. ECi:

B. ECi:>1.5, SAR > 10 & RSC> 2.5

C. ECi:>1.5, SAR 2.5

D. Both a & b

336. Soil structure without aggregation is known as____________________?
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A. Platy

B. Granular

C. Massive

D. Both b & c

337. Na and k can be determined by the use of____________________?
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A. Hydrometer

B. All the above

C. Flame photometer

D. Spectrophotometer

338. Which element can be fixed by smecitite___________________?
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A. Mg

B. K

C. NH2

D. Both b & c

339. Deficiency of B can be corrected through application of chemical fertilizer of_________________?
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A. Borax

B. Boric acid

C. Solubor

D. All the above
340. A compound toxic to crop formed by the thermal decomposition of urea is_________________?
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A. Uric acid

B. Biurct (NH2CONH CONH2 H2O)

C. Diuret

D. Both b & c

341. Histols are found in______________________?
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A. Pakistan

B. Canada

C. Alaska

D. Both b & c
342. DAP fertilizer available in Pakistan contains__________________________?
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A. 100%P2O3

B. 46%N & 18%P2O3

C. 18% N & 46% P2O5

D. 50%P2O3

343. The chemical formula for Ammonium acctatc is_____________________?
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A. NH3OAC

B. NH4OAC

C. NH4AOC

D. Both b & c

344. Mean annual precipitation for tundra region is ____________________?
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A. None of the above

B. 150-70 cm

C. 0-50 cm

D. 70-80 cm

345. An expression of the intensity of the basic or a acidic condition of a liquid or of soil is called_____________________?
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A. ESR

B. pH

C. EC

D. SAR

346. TSP contains____________________?
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A. 46%P

B. 14%

C. 40%P

D. 50%P

347. Boron concentration is irrigation water is considered safe only upto_________________?
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A. 0.7 ppm

B. 2 ppm

C. 3 ppm

D. 1.5 ppm

348. Mollic refers to____________________?
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A. C-horizon

B. U-horizon

C. Surface horizon

D. B-horizon

349. Permanent change in soil is due to__________________?
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A. pH change

B. Covalent bonding

C. Isomorphic substitution

D. Ionic bonding

350. The aggregation of individual particles is called___________________?
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A. Granulation

B. Texture

C. Flocculation

D. Structure