soil science Mcqs
401. A soil is categorized as saline when EC of saturation extract is______________________?
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A. 0.4 4.0 dsm-1

B. >4dsm-1

C. 0.4dsm-1

402. Fine-graned rocks formed on earth crust are called____________________?
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A. Intensive igneous rock

B. Extrusive rock

C. Plutonic

D. Sedimentary rock

403. The kaolininte is a layer silicate clay mineral, it is 1:1 type of mineral with___________________?
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A. None of the above

B. 40 meq/100g CEC

C. 3-15 meq/100g CEC

D. 50 meq/100g CEC

404. Percentage of N in Ammonium sulphate fertilizer is___________________?
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A. 21

B. 45

C. 35

D. 23

405. Total salt affected soils of Pakistan are____________________?
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A. 10.5 m ha

B. 12.3 m ha

C. 6.3 m ha

D. 5.0 m ha

406. Most widely spread mineral in the world is________________?
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A. None of the above

B. Iron

C. Kaolinite

D. Salt

407. Which is passive factor of weathering ?
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A. Organisms

B. Parent material

C. Climate

D. Temperature

408. Rhyolite in nature is______________________?
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A. Acidic

B. Basic

C. Both a & b

D. None of the above

409. Na2CO3 salts is___________________?
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A. Neutral

B. Alkaline

C. None of the above

D. Acidic

410. Perfect hardness of any mineral is determined by___________________?
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A. None of the above

B. pH scale

C. Foot scale

D. Mhos scale
411. Sugar cane is_____________________?
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A. None of the above

B. C3 plant

C. C4 plant

D. C2 plant

412. Rocks having coarse bubble holes are called_______________________?
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A. Purr ice

B. Scoria

C. Mafic

D. Felsic

413. Planets in our system are____________________?
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A. 9

B. 8

C. 10

D. 12

414. The earth core is made of the following metals ______________________?
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A. None of these

B. Cu & Ni

C. Mg & Ni

D. Fe & Ni
415. Weathering of gabbros gives_____________________?
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A. Clay and iron oxide

B. Sand and clay

C. Sand and iron oxide

D. Clay and Mg oxides

416. The term applied to a material which tends to absorb moisture from the atmosphere is called__________________?
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A. Available

B. Hydroscopic

C. Capillary

D. Gravitational

417. Father of agricultural chemistry is___________________?
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A. Neuron

B. Neil Brady

C. Vonliebig

D. J. jones

418. pH of Pakistani soils is____________________?
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A. 14

B. 12

C. 7

D. 7.5
419. The available form of sulphur for plant is___________________?
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A. SO3

B. S2

C. SO2

D. SO-2
420. Lithosphere refers to____________________?
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A. Zone of ozone

B. Zone of earth crust

C. Zone of water

D. Zone of atmosphere

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
441. The inner shell of earth consists of_____________________?
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A. Silicate

B. Fe

C. Silicate of Fe & Mg

D. Mg

442. Common soils found in Pakistan are___________________?
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A. Entisols

B. All the above

C. Inceptisols

D. Arid soils

443. Process of mixing soil by fauna and flora is called__________________?
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A. Pedoturbation

B. Lessivage

C. Leaching

D. Enrichment

444. The available form of calcium to plant is________________?
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A. Ca

B. CaO

C. Ca(free cation

D. None of the above

445. A soil is classified as sodic soil when______________________?
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A. EC is 8.5

B. All the above

C. SAR is >13
446. The wearing away of the land surface by wind, water, ice or other geological agents is called____________________?
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A. Soil erosion

B. All the above

C. Soil contamination

D. Seepage

447. Color of fertile soil is_____________________?
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A. Black

B. Green

C. Brown

D. White

448. The nutrient particularly influencing root growth is___________________?
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A. Phosphorus

B. Nitrogen

C. Organic

D. Zinc

449. The soil of Sindh (Pakistan) have pH______________________?
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A. 5.0 to 6.5

B. 7.5 to 8.5

C. 6.5 to 7.5

D. 8.5 to 9.5

450. Gravimetric water is present in__________________?
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A. Mesopores

B. Microspores

C. Macrospores

D. Nanopores