soil science MCQs – Page 19

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

soil science Mcqs
361. Part of soil which is in contact with root surface is called___________________?
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A. Lithoshpere

B. Rhizoshpere

C. None of the above

D. Atmoshpere

362. [(NH4)2SO4FeSO66H2O] is the formula of _______________________?
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A. Ammonium sulphate Iron sulphate

B. None of the above

C. Ferrous Ammonium sulphate

D. Sodium ammonium sulphate

363. Point of zero change means____________________?
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A. All are ionic bond

B. All the covalent bonds

C. None of the above

D. Zero charge at surface
364. While diluting acid always add_____________________?
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A. Acid to water

B. Water to acid

C. Both a & b

D. none

365. Microorganisms have C/N ratio of____________________?
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A. 4:1

B. 12:01

C. 20:01

D. 2:01

366. Thickness of Dikes ranges from___________________?
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A. Few m 10 m

B. Few cm 10 cm

C. 2-10 m

D. 10-12 cm

367. Soil moisture and ET losses are_________________?
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A. Occasionally related

B. Inversely related

C. Not related

D. Directly related
368. The chemical formula of urea fertilizer is_______________________?
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A. NH<sub>2</sub>CONH<sub>2</sub>

B. [CO(NH<sub>2</sub>)]

C. Both a & b

D. None of the above

369. The exact formula for calculating the base saturation percentage is_____________________?
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A. Bas saturation percentage = CA+Mg+Na / CEC x 100

B. None of the above

C. Bas saturation percentage = /CEC / CA+Mg+Na x 100

D. Bas saturation percentage = /CEC / CA+Mg x 100

370. Humic acid is soluble in______________________?
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A. Acid

B. Alkali

C. Both a & b

D. Distilled water

371. Which silica mineral is present in soil in abundant quantity____________________?
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A. Smectite

B. Quartz

C. All the above

D. Gypsum

372. The factor used for conversion of P to P2O3 is____________________?
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A. o.453

B. None of the above

C. 0.643

D. 0.436
373. According to WAPDA, the ECe of the salt free soil should remain__________________?
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A. 4-8 dsm-1

B. None of the above

C. < 4 dsm-1

D. Equal to 4 dsm-1

374. The lower limit of available water is called ____________________?
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A. Field capacity

B. Hygroscopic water

C. Available water

D. Wilting point
375. Tuff is__________________?
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A. Consolidated ash

B. Soil

C. Water

D. Volcanic ash
376. The science of growing terrestrial plants in an aerated solution is known as___________________?
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A. Hydrology

B. Nutrient film technique

C. Hydrants

D. Hydroponics
377. Accumulation of soluble salts root zone is known as____________________?
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A. Sodication

B. Degradation

C. Desodication

D. Salininzation
378. Slipperiness is due to__________________?
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A. Vander walls forces

B. None of the above

C. Wire bond

D. Covalent bond

379. Antioxidant is used to reduce the process of_____________________?
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A. Reduction

B. Oxidation

C. Both a & b

D. Dehydration

380. The toxicity level of Zn (mg/kg) in plants suggested by some workers is___________________?
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A. > 50 mg kg-1

B. None of these

C. > 10 mg-1

D. > 400 mg kg-1