soil science Mcqs
351. Radiation can be detected by the blankening of photographic film or by using___________________?
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A. Ratio autoanalyser

B. GM counter

C. Neutron probe

D. Dosimeter

352. C12H12N-NaO8S2 is the chemical formula of ____________________?
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A. Carbonated sodium sulphate

B. Azomethine H

C. Activated charcoal

D. None of the above

353. Rocks which are formed by disintegration of pre-existing rocks by weathering are____________________?
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A. Greis

B. Sand stone

C. Classics

D. Igneous

354. The water loss through transpiration from vegetative and evaporation from soil surface is known as__________________?
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A. Evaporation

B. Evaptranspiration

C. Guttation

D. Transpiration

355. Soil particles having diameter greater than 2 mm are called___________________?
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A. Gravel

B. Silt

C. Clay

D. Sand

356. The time for which water and ion remains in vicinity is called_____________________?
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A. Residence time

B. ppm

C. Primary hydration

D. Normality

357. The moisture content below which a cohesive soil does stick to metal tools is known as______________________?
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A. Alter berg limit

B. Liquid limit

C. Plastic limit

D. Sticky limit
358. Igneous rock whose crystal is 1 cm called____________________?
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A. Felsic

B. Mafic

C. Pegmatitic

D. Plutonic

359. The deficient level of N (%) in plants suggested by various workers is____________________?
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A. 0%

B. 5%

C. 3%

D. 10%

360. Rocks formed from compacted clay or mud are called____________________?
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A. Clay stone

B. Sand stone

C. None of the above

D. Shale
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
381. Most abundant mineral in the earth crust is______________________?
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A. Feldspar

B. N-Feldspar

C. Amplubole

D. S-Feldspar

382. Metamorphic rocks are formed from____________________?
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A. Igneous rocks

B. Sedimentary rocks

C. Both a & b

D. Cleavage

383. Which soil is suitable for nce________________?
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A. None of the above

B. Fine textured

C. Sandy

D. Coarse textured

384. The device used for the measurement of positive pressure potential of soil water is known as_________________?
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A. Tensiometer

B. Piezometer

C. Lysimeter

D. Barometer

385. Which rock contain potash feldspar ?
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A. All the above

B. Gabbro

C. Norile

D. Syeruite
386. When two or more functional groups of single ligand are coordinated to metal cation the complex is termed as___________________?
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A. Solution complex

B. Complex ion

C. All the above

D. Chelate
387. Material deposited by the wind is called____________________?
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A. Regolith

B. Alluvium

C. Eolian

D. Colluvial

388. Rocks formed from molten magma are called__________________?
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A. Igneous rocks

B. Sedimentary rocks

C. Alluvial rocks

D. All the above

389. Salt-tolerant plants are called ____________________?
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A. Halophytes

B. Glycophytes

C. Xerophytes

D. All the above

390. Geochemical weathering processes occurs______________________?
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A. At the level

B. On the mountain

C. On surface

D. Below soil solum
391. Elements essentially required for growth of all plants species are___________________?
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A. 16

B. 32

C. 3

D. 15

392. The exact formula for sodium hexametaphosphate is___________________?
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A. [(NaPO6)13]

B. [(NaPO2)6]

C. [(NaPO3)13]

D. None of the above

393. The little clay mineral is_____________________?
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A. Non-expending

B. None of the above

C. None or little expending

D. Expending

394. The zorawar is brand name of ___________________?
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A. None of the above

B. TSP

C. DAP

D. MAP
395. The most abundant metal in the earths crust and toxic to plants in low concentration is____________________?
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A. Al

B. Fe

C. All the above

D. Mo

396. Addition of sodium hexametaphosphate in soil for determination of soil texture causes__________________?
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A. All the above

B. Agregation of soil particles

C. Dispersion of soil particles

D. Cementing of soil particles

397. The symbol of Na stands for___________________?
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A. Natrium

B. Nickle

C. Neon

D. None of these
398. Which compound decay slowly______________________?
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A. Amino acid

B. Lignin

C. Cellulose

D. fats

399. A treeless artic plain is called as___________________?
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A. Glaciers

B. None of the above

C. Barren land

D. Tundra
400. The reaction of Na2 CO3 salt is____________________?
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A. Alkaline

B. None of the above

C. Neutral

D. Acidic