soil science MCQs – Page 21

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

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