soil science MCQs – Page 10

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

soil science Mcqs
451. Sewage water consists of water and solids in the following percentage___________________?
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A. 90 & 10

B. 80 & 20

C. None of the above

D. 99 & 1
452. How many different minerals deposits are found in Pakistan ?
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A. None of the above

B. 30

C. 60

D. 100

453. Urea in manufactured form gases________________________?
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A. NH3

B. NH48CO2

C. NH3 & CH4

D. All the above

454. An ion or molecule in the coordination sphere central ion is called__________________?
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A. Chelate

B. Potential

C. Ligand

D. Complexion

455. Electrical conductivity of saturated paste is written as____________________?
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A. ECP

B. Ecw

C. ECs

D. ECe

456. Mineral soil contain organic carbon___________________?
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A. >4%

B. 5%

C. >10%

D.
457. Problem of erosion in Thal and Cholistan is due to____________________?
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A. Water

B. Wind

C. Fire

D. Atmosphere

458. The plant in which CO2 fixation is solely via the Calvin cycle is_____________________?
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A. CAB

B. CAM

C. C

D. C

459. Extraction of humic substance can be done by______________________?
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A. NH4OH

B. None of the above

C. NH4Cl

D. NaOH
460. Clear water with organic matter or sediment and minimum biological activity is known as__________________?
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A. Eutrophic

B. Mestrophic

C. Oligotrophic

D. Hydrotrophic

461. Main product of photosynthesis is_____________________?
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A. C6H12O6

B. C3H6O6

C. C12H24O12

D. C5H12O6

462. Soil water can be determined by_____________________?
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A. Mass water content

B. Macro pores

C. Both a & b

D. None of the above

463. The conductivity of a saturation extract is greater 4 dsm-1 an exchangeable sodium percentage (ESP) of less than 15 and the pH is usually less than 8.5 is called as__________________?
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A. Saline-sodic soils

B. Neutral soils

C. Saline soils

D. Sodic soils

464. Equation of Ozone is________________________?
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A. O2 O

B. None of the above

C. O3 + O

D. O2 + O =O3
465. A soil with an ESP greater than 15 is usually classified as___________________?
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A. Sodic soil

B. Saline soil

C. None of the above

D. Acidic soil

466. Which bacteria causes fermentation__________________?
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A. Bacillus

B. Corey

C. Azotobacter

D. Pseudomonas
467. Which soil bolds more water ?
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A. Sitry

B. Sandy

C. Clayey

D. Stony

468. Which one of the following is physical property of soil______________________?
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A. Oxidation

B. Reduction

C. None of the above

D. Hydration

469. Age of Earth is_____________________?
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A. 4 billion years

B. 4.5 billion years

C. 6 billion years

D. 1 billion years

470. Acid soils of the worlds arable comprise up to_____________________?
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A. 58%

B. 40%

C. 20%

D. 30%

471. The unit of electrical conductivity is____________________?
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A. mmhos/m

B. dsm-1

C. ms/cm

D. Al the above

472. Felsic rocks consists of___________________?
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A. fe

B. Buiotitic

C. Quartz

D. Quartz & Feldspars
473. Product of microorganism that appears to chelate calcium is called_____________________?
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A. Phospheric acid

B. Carbon dioxide

C. 2-ketoghconic acid

D. Pyruive acid

474. Auxins promote___________________?
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A. Cell elongation

B. Cell division

C. Both a & b

D. None of the above

475. pH in coniferous forest is__________________?
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A. Less than 7

B. Neutral

C. Greater than 7

D. Basis

476. Pneumatic potential is due to____________________?
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A. Petrol

B. Gas

C. Soil

D. Water

477. The net reaction of photosynthesis is_____________________?
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A. None of the above

B. CaCO3 + 2HCl CaCl2 H2O+CO3

C. CO2 + H2O light O2 + (CH3O)

D. ((CH2O) + O2 CO2 + H2O)

478. Acid soil contain pH____________________?
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A. 8.5

B. >7

C. >7.0

D.
479. Cyclic salts are mostly of ______________________?
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A. None of the above

B. Cl

C. SO4

D. HCO<sub>3</sub>

480. International atomic weight of potassium is_________________?
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A. 41

B. 40

C. 38

D. 39.0
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