soil science MCQs – Page 25

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

soil science Mcqs
481. Mechanisms of material uptake by plants is by____________________?
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A. Diffusion

B. Mass flow

C. Root interception

D. Osmosis

482. Shrinking and swelling is property of__________________?
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A. Smecitie

B. Water

C. Silk

D. Clay

483. The particlesw density of a mineral soil is about____________________?
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A. 2550 Kg m-3

B. 2650 Kg m-3

C. 2750 Kg m-3

D. None of the above

484. hydrosphere refers to______________________?
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A. Zone of water

B. Zone of earth crust

C. Zone of atmosphere

D. Zone of air

485. Physical condition of soil for plant growth is called___________________?
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A. All the above

B. Granulation

C. Tilth

D. Tillage

486. The salinity can be reduced by the application of___________________?
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A. All the above

B. Urea

C. Lime

D. Sulphuric acid

487. Buffer solution is a solution which resist change in __________________ ?
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A. SAP

B. pH

C. EC

D. RSC

488. Chromium (Cr) is a____________________?
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A. Secondary element

B. Heavy metal

C. Free element

D. Macro element

489. Kaolinite can be identified by______________________?
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A. Boiling

B. Breaking

C. X-ray diffraction

D. Spectrophotometer

490. Examples of micro biota are____________________?
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A. Protozoa

B. Virus

C. Both a & b

D. None of the above

491. Permanente wilting point of clayey soils is not less than____________________?
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A. 10%

B. 20%

C. 15%

D. 5%

492. The problem of soil crosion Thal and Cholistan is predominantly due to___________________?
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A. Air

B. Wind

C. Water

D. All the above

493. Who characterized soil formation as set of 4 process______________________?
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A. Simonson

B. Jinney

C. Ziking

D. Newton

494. Plutonic rocks are also called____________________?
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A. Extrusive igneous rock

B. Sedimentary

C. Intrusive igneous

D. Metamorphic

495. Algal photosynthesis increases pH of water and releases___________________?
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A. O2

B. All the above

C. CO2

D. SO3

496. Identify the fertilizer (s) containing potassium____________________?
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A. All the above

B. MOP

C. Chilean salt peter

D. SOP

497. Color off basic matic rock is_____________________?
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A. Light green

B. Blue

C. Dark colored

D. Yellow

498. The formula used for calculating RSC is _____________________?
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A. None of the above

B. RSC=(CO32 + HCO2) ( Ca2 + Mg2)

C. non of these

D. RSC=(CO32 + HCO2) (Na + K + Ca2 + Mg2)

499. Which instrument is used for determining soil texture___________________?
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A. All the above

B. Thermometer

C. Hydrometer

D. Lysimeter

500. The safe limit of No2 in drinking water is_____________________?
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A. None of the above

B. 10 mg L-1

C. 20 mg L-1

D. 15 mg L-1