soil science MCQs – Page 22

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

soil science Mcqs
421. Primary air pollution is____________________?
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A. SO

B. SO3

C. SO2

D. None of the above

422. Most of the productive soils in Pakistan have pH______________________?
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A. None of the above

B. 8.5

C. Between 7.5 to 8.5
423. The chemical formula of Dolomite is________________?
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A. CaMg (CO3)2

B. MgCO3

C. None of the above

D. CaCO3

424. Formula used for the calculation of sodium absorption ratio is______________________?
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A. SAR=Na / CEC x 100

B. SAR=Na / CEC x 100

C. SAR=Na / [(Ca+Mg)1/2] Na x 2

D. None of these

425. Large pieces of erupted magma are called_____________________?
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A. Volcanic block

B. Volcanic ash

C. Dike

D. Sill

426. Vertical movement of water was studied by_________________?
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A. Niel

B. Darcy

C. Ziebig

D. Kohler

427. Who gave the defination of humic acid ?
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A. Gapon

B. Liekig

C. Neir

D. Felbeek
428. Organic soil are called____________________?
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A. Peat

B. Arid soil

C. Muck

D. Both a & b
429. Gravimetric water is present in______________________?
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A. None of the above

B. Macro pores

C. Micro pores

D. Meso pores

430. Places where volcanoes occur are_________________?
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A. All the above

B. Pacific ocean

C. Mid-Atlantic ridge

D. Mediterranean sea

431. Percentage of N in Ammonium ritract fertilizer is___________________?
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A. 21

B. 39

C. 23

D. 33
432. The site of grains present in sands structuring range__________________?
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A. 0.0625 mm dia

B. 0-1.0 mm dia

C. None of the above

D. 1.00 0.0625 mm dia

433. The atmospheric layer lies closest to the earth surface is known as___________________?
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A. Stratosphere

B. Thermosphere

C. Mesosphere

D. Troposphere
434. Chitin and steroids are_____________________?
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A. Waxes

B. Carbohydrates

C. Proteins

D. Lipids

435. Which one of the following are macro nutrients__________________?
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A. N,P,K

B. Ca,Mg,S

C. All the above

D. C,H,O

436. Structure and size of aphantic rock is________________?
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A. Large-Glassy

B. Phenocryst

C. Fine grained

D. Course-grained like

437. Solution containing molecular weight of a substance in gram per liter of a solution is known as______________________?
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A. None of the above

B. Molar

C. Normal

D. Molal

438. Corrositivity of water is an indication of___________________?
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A. Salinity

B. Property of polluted material

C. Both a & b

D. None of the above

439. While handing concentrated acids. bases or other hazardous chemicals use_________________?
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A. Table

B. Fume hoods

C. Both a & b

D. None of the above

440. Which compound is mostly used in Pakistan for the reclamation of saline-sodic & sodic soils_________________?
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A. Calcite

B. Dolomite

C. Apatite

D. Gypsum