soil science MCQs – Page 17

Practise focused soil science questions with marked answers for exam preparation and subject revision.

soil science Mcqs

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

Showing 321 to 340 of 503 mcqs