soil science MCQs – Page 14

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

soil science Mcqs
261. Organic matter in Pakistani soils is generally:_________?
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A. less than 1 %

B. 3%

C. 5%

D. less than 10 %

262. The evolution of new species is known as_____________?
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A. Speciation

B. None of these

C. Smog

D. Specialization

263. According to the Soil survey of Pakistan, the total waterlogged summer-rain area in the country is:_________?
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A. 22.5 mha

B. 4.11 mha

C. The above statement is wrong

D. 5.16 mha

264. The water diffusivity has the units of:__________?
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A. cm2

B. s/cm

C. cm2/s

D. cm/s

265. Fossils are found in__________type of rocks:
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A. Sedimentary rocks

B. Metamorphic rocks

C. Aqueous rocks

D. both A & C
266. In Pakistan, The following igneous rocks are found over considerable areas:
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A. Slate, Shist

B. Marl, gypsum

C. Dolomite shale, gneiss

D. None of the above
267. Which element is found highest in earth crust?
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A. None of the above

B. Aluminum

C. Sodium

D. Silicon

268. Which type of soil is found near the canal banks:
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A. Alkaline

B. Acidic & Alkaline

C. Calcareous

D. Acidic

269. Depending on the percentage of sand, silt, clay, soils are divided into _______ textural classes:
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A. 12

B. 14

C. 13

D. 9

270. Decomposition of the organic matter in submerged soil is carried out by?
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A. Algae

B. None of the above

C. Actinomycetes

D. Fungi

271. Which of the following is a component of nucleic acid and protein:
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A. Ca

B. None of the above

C. N

D. Mg

272. Soil Organic Matter (SOM) which consists of about _______ % organic carbon plays a vital role by providing macro & micro nutrients:
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A. 72%

B. 62%

C. Al of the above

D. 58%
273. The process by which nutrients chemicals or contaminants are dissolved and carried away by water, or are moved into a lower layer of soil:
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A. Percolation

B. Infiltration

C. Leaching

D. Seeping

274. The soil samples are dried at _______________, for gravimetric soil analysis?
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A. 110 <sup>0</sup>C

B. 120 <sup>0</sup>C

C. both A and B

D. 105 0C
275. Most abundant organic compound in nature?
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A. Lignin

B. Hemicellulose

C. Cellulose

D. All of these

276. Select the water soluble phosphatic fertilizer from the following__________?
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A. All of these

B. SSP

C. DSP

D. TSP

277. The maximum amount of water which a soil can hold after free drainage has ceased is called as_______?
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A. Water harvesting

B. Water use efficiency

C. Water potencial

D. Water holding capacity
278. Aridisols cover the largest in Pakistan_______?
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A. 278,910 km<sup>2</sup>

B. 259,710 km2

C. 269,810 km<sup>2</sup>

D. None of these

279. Wind transported materials if it is silt dominated is__________?
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A. Colluvial

B. Eolian

C. Alluvial

D. Loess
280. Clay and humus particles are referred to as colloids and are less than 0.002mm. Due to their small size, colloids have ________________ surface area which provides surface for adsorption, catalysis, precipitation and microbial colonization:
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A. Very little

B. None of these

C. Extremely high

D. Extremely low