soil science MCQs – Page 11

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

soil science Mcqs
201. A and B horizon is called as_________?
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A. Solam

B. Inner core

C. None of the above

D. Regolith

202. Basalt is a __________ rock:
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A. fine-grained

B. Dark coloured

C. both A & B

D. None of the above

203. following are types of weathering:
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A. Geo chemical weathering

B. Judo weathering

C. Pedo chemical weathering

D. both a and c
204. A horizon of the soil is also designated:
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A. Eluvistal horizon

B. Illuviated horizon

C. Alluvial horizon

D. None of the above.
205. What is the concentration of pure water?
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A. 55.5 mol/L

B. 45.5 mol/L

C. Both a and b

D. none of these

206. What is the effect of application of P2O5 fertilizer to a green manure leguminous crop in the availability of phosphorus to the succeeding crop?
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A. It fixes the P2O5 through humus and reduces the availability..

B. Green manure increases the availability in organic from to the next crop

C. Greater amount of phosphorus is taken up and converted into organic form, which is released on decomposition of green matter

D. It does not affect the availability of phosphorous to succeeding crop
207. Which of the following are secondary minerals:
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A. Clay minerals

B. All of the above

C. Iron and aluminiumoxides

D. Amorphous silicates

208. The following types of check dams have been tried in Pakistan:
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A. Cement & stone check dams

B. Brushwood check dams

C. All of the above

D. Loose stone or wire-bound check dams

209. A set of soils with same parent material, topography, climate and biota but different age is called_________?
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A. Topography

B. Topo sequence

C. Catena

D. Chrono sequence
210. The relative abundance of three types of rocks ( igneous-metamorphic- sedimentary) in the earths crust is_________?
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A. 12.5 % -12.5 % 75%

B. 64.7 % 27.4 % 7.9 %

C. 7.9% 27.7 % 64.4

D. none of A & B

211. In land capability classification, class I-Iv are suitable for:_________?
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A. Suitable for grazing

B. Unsuitable for any agricultural use

C. Suitable for cultivated farming

D. Suitable for forestry

212. The indicator used for estimation of the soil available boron is_______?
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A. Azomethine-H

B. Phenolpthalein

C. Diphenyle

D. Mixed indicator

213. Organic (O) horizon is absent in_________?
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A. Non-arable soils

B. Histosols

C. Mollisols

D. Arable soils
214. _________is probably the most important growth limiting factor in acid soils especially those having pH below 5.0-5.5?
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A. Nitrogen

B. Potassium

C. Calcium

D. Aluminium
215. __________ particles range in diameter between 0.02 to 0.002 mm:
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A. None of the above

B. Sand

C. Clay

D. Silt
216. The term rhizosphere was coined by:___________?
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A. Winogrdsky

B. Hiltner

C. Baussingault

D. Liebig

217. Causes of Soil are:__________?
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A. All of these

B. Mismanagement of irrigation syste

C. Indiscriminate felling of trees

D. Over grazing

218. The marble is a__________?
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A. Thermo metamorphic

B. Not sure

C. Dynamo metamorphic

D. Hydro metamorphic

219. Phosphorus deficiency is widespread in most (_____%) 0f the soils of Pakistan.
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A. 32%

B. 68%

C. 54%

D. 90%

220. Granite and Basalt are examples of:___________?
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A. Stratified rocks

B. >None of the above

C. Aqueous rocks

D. Sedimentary Rocks