Who is regarded as the father of agricultural chemistry?
Correct answer B. Von Liebig
Topic / 475 questions
Soil Science MCQs
Soil Science MCQs are multiple-choice questions about how soils form, their physical and chemical properties, nutrient supply, salinity and erosion. They suit agriculture graduates preparing for Agriculture Officer, PPSC, FPSC and ICAR AIEEA tests. Every question comes with an instant answer, helping you confirm facts on soil texture, colloids and fertility as you practise.
What are organic soils called?
Correct answer A. Peat
What is the main product of photosynthesis?
Correct answer C. C6H12O6
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By which mechanism are nutrients mainly taken up by plants?
Correct answer D. Mass flow
How many planets are there in our solar system?
Correct answer C. 8
What does the hydrosphere refer to?
Correct answer B. Zone of water
What does the inner shell of the earth, beneath the crust, consist of?
Correct answer C. Silicate of Fe & Mg
What are fine-grained rocks formed at the earth’s surface called?
Correct answer A. Extrusive rock
Which rock contains potash feldspar?
Correct answer C. Syenite
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What are rocks formed from compacted clay or mud called?
Correct answer C. Shale
Which type of rock is the hardest?
Correct answer A. Metamorphic
What is the most abundant mineral group in the earth’s crust?
Correct answer B. Feldspar
Which compound is most widely used in Pakistan to reclaim saline-sodic and sodic soils?
Correct answer A. Gypsum
Where do geochemical weathering processes take place?
Correct answer B. Below soil solum
What colour are basic (mafic) rocks?
Correct answer B. Dark colored
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What is an igneous rock with crystals of about 1 cm or larger called?
Correct answer A. Pegmatitic
What are thick concordant intrusions that push overlying sediments up into dome-shaped hills called?
Correct answer D. Laccoliths
Where do volcanoes occur?
Correct answer D. All of the above
What are large fragments of erupted magma called?
Correct answer A. Volcanic block
What does the weathering of gabbro produce?
Correct answer A. Clay and iron oxide
About Soil Science MCQs
This category covers pedology and edaphology in a practical, exam-focused way. Questions deal with parent material and weathering, the role of wind and water in transporting sediments, soil genesis and classification, particle size classes such as clay, silt and sand, and the charged surfaces of soil colloids. Chemistry topics include cation exchange, humic substances, coordination ions and the salts that dominate saline and alkali soils.
Soil fertility and management form the second major strand. You will meet questions on mobile and immobile plant nutrients, foliar feeding of nitrogen and phosphorus, decomposition of organic matter in waterlogged soils, laboratory safety, and erosion problems in arid regions such as Thal and Cholistan. These ideas are tested heavily in agriculture department recruitment because they link directly to crop yields and land reclamation.
Key facts to remember
- Clay particles are smaller than 0.002 mm in diameter under the USDA system.
- Basalt is a fine-grained igneous rock formed from rapidly cooled lava.
- Alkali (sodic) soils are dominated by sodium salts, especially sodium carbonate.
- Organic matter decomposition in submerged soils is carried out mainly by anaerobic microorganisms.
- Pedology is the study of soil formation, classification and mapping in its natural setting.
Exams that include Soil Science MCQs
Pakistan
- PPSC
- FPSC
- SPSC
- KPPSC
- Lecturer tests
- NTS
India
- ICAR AIEEA
- UGC NET
- State PSC exams
Bangladesh
- BCS
- Government job tests
- University admission tests (DU, RU, JU)
How to prepare for Soil Science MCQs
- Memorise the particle size limits for sand, silt and clay, as texture questions appear in almost every agriculture officer paper.
- Learn which nutrients are mobile and immobile in plants, because deficiency symptom questions depend on where the leaves show signs first.
- Compare saline, sodic and saline-sodic soils in a small table covering pH, dominant salts and reclamation methods.
- Connect erosion questions to local examples like Thal and Cholistan, where wind erosion in sandy desert soils is the main problem.
Frequently asked questions
What are the most important topics in Soil Science MCQs?
Key topics include soil formation and weathering, soil texture and structure, soil colloids and cation exchange, essential plant nutrients, soil fertility, salinity and sodicity, and soil erosion and conservation. Questions on soil organic matter and humus also appear often, so revise how decomposition differs under aerobic and waterlogged conditions.
How many Soil Science MCQs are on MCQs360?
There are 493 Soil Science MCQs on MCQs360, all with instant answers. You can practise them free without creating an account, which makes it easy to revise a few questions each day alongside other agriculture subjects such as agronomy and plant breeding.
Which exams ask Soil Science MCQs?
Soil Science questions appear in Agriculture Officer and Soil Scientist posts advertised by PPSC, FPSC, SPSC and KPPSC, as well as agriculture lecturer tests. In India they are part of ICAR AIEEA and UGC NET agriculture papers, and in Bangladesh they feature in BCS agriculture cadre and related government job tests.
What is the difference between saline and sodic soils?
Saline soils contain high levels of soluble salts such as chlorides and sulphates of sodium, calcium and magnesium, but their pH usually stays below 8.5. Sodic or alkali soils have excess exchangeable sodium, a pH above 8.5 and poor structure. Saline soils are reclaimed by leaching, while sodic soils usually need gypsum before leaching.
Last reviewed October 2026