- 1. Soil physics is the study of the physical properties and processes of soil, including its composition, structure, and behavior under different conditions. It involves the investigation of how soil particles interact with each other and with water, air, and other components of the soil environment. Soil physics plays a crucial role in understanding soil fertility, water movement in the soil, and the availability of nutrients to plants. By studying soil physics, scientists can better predict soil erosion, land degradation, and the impact of agricultural practices on the environment. Overall, soil physics is essential for sustainable soil management and ensuring the long-term productivity of agricultural lands.
What is the primary purpose of soil physics?
A) Understanding the physical properties of soil
B) Examining soil chemical composition
C) Analyzing plant growth in soil
D) Studying animal habitats in soil
- 2. Which soil particle size is the smallest?
A) Silt
B) Gravel
C) Sand
D) Clay
- 3. What is soil bulk density?
A) Particle size distribution in soil
B) Amount of organic matter in soil
C) Amount of water in soil
D) Mass of soil per unit volume
- 4. Which of the following is a primary soil-forming factor?
A) Parent material
B) Time
C) Climate
D) Organisms
- 5. What is the layer typically found underneath the topsoil?
A) Parent material
B) Subsoil
C) Bedrock
D) Regolith
- 6. What is the energy required to remove water from soil called?
A) Gravitational potential
B) Field capacity
C) Matric potential
D) Hydraulic conductivity
- 7. What soil property is a mix of sand, silt, and clay known as?
A) Soil texture
B) Soil structure
C) Soil fertility
D) Soil compaction
- 8. What factor influences soil color the most?
A) Soil pH
B) Mineral composition
C) Soil structure
D) Organic matter content
- 9. What does soil pH measure?
A) Soil structure
B) Soil texture
C) Acidity or alkalinity of soil
D) Soil fertility
- 10. How does soil texture affect soil fertility?
A) It determines soil color
B) It affects soil pH
C) It influences nutrient retention and water availability
D) It impacts soil compaction
- 11. What is the term for water movement downward in soil?
A) Leaching
B) Transpiration
C) Erosion
D) Percolation
- 12. Which horizon is often referred to as the zone of accumulation?
A) C horizon
B) A horizon
C) O horizon
D) B horizon
- 13. What is the ability of soil to hold onto nutrients called?
A) Hygroscopic coefficient
B) Soil acidity
C) Cation exchange capacity
D) Leaching potential
- 14. What is the water content of soil referred to shortly after rain or irrigation?
A) Permanent wilting point
B) Hygroscopic coefficient
C) Saturation point
D) Field capacity
- 15. Which soil particle size is the largest?
A) Silt
B) Clay
C) Loam
D) Sand
- 16. What is the term used for the upper layer of soil commonly worked by farmers and gardeners?
A) Regolith
B) Topsoil
C) Subsoil
D) Bedrock
- 17. What is the term for the movement of water through soil?
A) Erosion
B) Infiltration
C) Evaporation
D) Percolation
- 18. What is the process of soil particles being carried away by water or wind?
A) Compaction
B) Decomposition
C) Erosion
D) Leaching
- 19. What is the measurement of the pore spaces in soil?
A) Density
B) Permeability
C) Compaction
D) Porosity
- 20. What is the term for the loss of soil nutrients due to water moving downwards through the soil?
A) Mulching
B) Leaching
C) Compaction
D) Fertilization
- 21. What is the study of the movement and storage of water in the soil called?
A) Pedology
B) Meteorology
C) Hydrology
D) Agronomy
- 22. What is the term for the process of breaking down rocks into smaller particles by physical means?
A) Weathering
B) Leaching
C) Decomposition
D) Erosion
- 23. What is the measure of the acidity or alkalinity of soil?
A) EC
B) LAI
C) NPK
D) pH
- 24. What is the process in which soil particles are compressed together, reducing pore space?
A) Leaching
B) Weathering
C) Compaction
D) Erosion
- 25. What is the typical range of soil particle size for silt?
A) 0.05 - 2.0 mm
B) less than 0.002 mm
C) 0.002 - 0.05 mm
D) greater than 2.0 mm
- 26. Which soil property is directly related to soil compaction?
A) Porosity
B) Permeability
C) Bulk density
D) CEC
- 27. Which soil texture is a balanced mix of sand, silt, and clay?
A) Clay
B) Loam
C) Sand
D) Silt
- 28. What is the term for the decomposition process where organic matter is broken down into simpler substances?
A) Percolation
B) Mineralization
C) Leaching
D) Evaporation
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