Free Soil Science MCQs with Answers
377 Soil Science MCQs from Agriculture, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Regolith
- B. Poly-pedon
- C. the solumOTS test preparation
- D. Series
Explanation: The solum is the biologically active soil profile formed by the A and B horizons.
Correct answer: the solumOTS test preparation- A. Percolation
- B. Permeability
- C. Infiltration
- D. Drainage
Explanation: Percolation is the downward movement of water through the soil profile after it has entered the soil.
Correct answer: Percolation- A. Field Capacity (FC)
- B. Hygroscopic coefficient
- C. Maximum water holding capacity
- D. Permanent wilting point
Explanation: The hygroscopic coefficient is the water held by an oven-dry soil when exposed to air at 100% relative humidity.
Correct answer: Hygroscopic coefficient- A. Sugar, celluloses, hemicelluloses
- B. Proteins, lignins
- C. All of the above
- D. Waxes, lipids
Explanation: Plant and animal residues contain carbohydrates such as sugars, cellulose and hemicellulose, as well as proteins, lignin, waxes and…
Correct answer: All of the above- A. Increase in Soil pH
- B. None of the themSearch Public Records
- C. Remains same
- D. Decrease in soil pH
Explanation: Anion retention is mainly associated with positive charges on soil colloids, which increase as soil pH decreases.
Correct answer: Decrease in soil pH- A. 1.6 Mg/m³
- B. 2.6 Mg/m³
- C. 1.3Mg/m³
- D. None of themSoil
Explanation: The average particle or true density of mineral soil is about 2.65 Mg/m³, commonly rounded to 2.6 Mg/m³.
Correct answer: 2.6 Mg/m³- A. Leaching
- B. Capillary water
- C. Infiltration
- D. All of them
Explanation: Infiltration is the entry of water into the soil surface. Leaching is the downward movement of dissolved materials, while capillary water…
Correct answer: Infiltration- A. India
- B. France
- C. China
- D. The Netherlands
Explanation: The journal Soil, formerly associated with the title Journal of Plant and Soil, is published by Springer Nature from the Netherlands.
Correct answer: The Netherlands- A. Calcite
- B. Apatite
- C. Dolomite
- D. Gypsum
Explanation: Apatite is a major phosphorus-bearing mineral and an important source of phosphorus in many soils.
Correct answer: Apatite- A. Surface tension
- B. Adhesion
- C. Cohesion
- D. All are correct
Explanation: Cohesion is the attractive force between particles or molecules of the same substance, such as water molecules.
Correct answer: Cohesion- A. 12250 tonnes/day
- B. 65, 772 tonnes/day
- C. 47,920 tonnes/day
- D. All of the above
Explanation: A commonly cited estimate for solid waste generation in Pakistan is about 47,920 tonnes per day.
Correct answer: 47,920 tonnes/day- A. Erosion
- B. Salinity
- C. Waterlogging
- D. All of the above
Explanation: Erosion removes productive topsoil, while salinity and waterlogging impair root growth and reduce soil productivity.
Correct answer: All of the above- A. Hetrophyics
- B. Halophyte
- C. Viticphyics
- D. Hortiphyics
Explanation: A halophyte is a plant adapted to grow in saline or salt-affected soil. The other terms are misspellings or unrelated names.
Correct answer: Halophyte- A. Azotobacter
- B. Nitrobacter
- C. Nitrosomonas
- D. Rhizobium
Explanation: Nitrosomonas carries out the first step of nitrification by oxidizing ammonia or ammonium to nitrite.
Correct answer: Nitrosomonas- A. Sandy Soil
- B. Both A & CFind Geological Maps
- C. Gravely soil
- D. Clay soil
Explanation: Clay soil has the highest cation exchange capacity because its fine particles have a large surface area and many negatively charged…
Correct answer: Clay soil- A. Neutral
- B. Alkaline
- C. Acidic
- D. None of these
Explanation: Phosphorus is most available near neutral soil pH, roughly 6 to 7. In acidic soils it is fixed by iron and aluminium, while in alkaline…
Correct answer: Neutral- A. Diffusion
- B. Interception
- C. None of the aboveHire Grant Writers
- D. Mass flow
Explanation: Nitrogen, especially nitrate, reaches plant roots mainly through mass flow with moving soil water, although diffusion also contributes.
Correct answer: Mass flow- A. All the macropores filled with air & the micropores filled with water
- B. All the macropores filled with water & the micropores filled with air
- C. All the macro & micropores in the soil are filled with water
- D. All of the above wrong
Explanation: At field capacity, excess gravitational water has drained from the macropores, leaving them filled mainly with air while micropores retain…
Correct answer: All the macropores filled with air & the micropores filled with water- A. Rill-Sheet-Gully
- B. Sheet-Rill-Gully
- C. Gully-Sheet-Rill
- D. None of these
Explanation: Water erosion normally progresses from sheet erosion to rill erosion and finally to gully erosion as concentrated runoff removes…
Correct answer: Sheet-Rill-Gully- A. Soil Silt
- B. Soil sandSoil
- C. Soil loam
- D. Soil colloids
Explanation: Particles smaller than 0.001 mm have very high surface area and behave as soil colloids, which strongly influence water-holding capacity…
Correct answer: Soil colloidsSoil Science MCQs: common questions
Are these Soil Science MCQs free?
Yes. All Soil Science MCQs from Agriculture are free on TestUstad, with unlimited attempts and no account needed. Nothing on this page is a sample or a trial.
How many Soil Science MCQs are on this page?
There are 377 Soil Science MCQs in the Agriculture bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Soil Science MCQ have an explanation?
Yes. Each Soil Science question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
Can I take a timed Soil Science test?
Yes. The practice button on this page starts a free Soil Science test drawn from the Agriculture bank. It marks each answer instantly, gives you a score at the end, and can be retaken as many times as you like.