Soil Science 2
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Question No. 1
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Which soil texture exhibits the highest water retention capacity?
A.
Sandy soil
B.
Silty soil
C.
Clay soil
D.
Loamy soil
Question No. 2
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The term 'heavy soil' refers to:
A.
Soil with high bulk density
B.
Soil that offers resistance to implements
C.
Soil with a high percentage of organic matter
D.
Soil with a high percentage of sand
Question No. 3
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Which soil structure is considered most favorable for plant growth?
A.
Platy
B.
Prismatic
C.
Spheroid (granular/crumb)
D.
Blocky
Question No. 4
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What is the primary factor influencing soil bulk density?
A.
Particle size distribution
B.
Organic matter content
C.
Soil structure
D.
All of the above
Question No. 5
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Which component of soil makes up approximately 5% of its volume?
A.
Mineral matter
B.
Organic matter
C.
Air space
D.
Water
Question No. 6
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How is particle density typically measured?
A.
Hydrometer method
B.
Pycnometer
C.
Liquid limit device
D.
Munsell color chart
Question No. 7
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Which soil type generally has a higher bulk density?
A.
Sandy soil
B.
Clay soil
C.
Silty soil
D.
Loamy soil
Question No. 8
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What does the redox potential (Eh) of soil indicate?
A.
Nutrient availability
B.
Water content
C.
Oxygen availability
D.
Soil pH
Question No. 9
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Which property of soil is determined using a Munsell color chart?
A.
Texture
B.
Structure
C.
Color
D.
Consistency
Question No. 10
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What is the Atterberg Limit that represents the lowest moisture content at which a soil can be deformed without cracking?
A.
Liquid Limit
B.
Plastic Limit
C.
Shrinkage Limit
D.
Sticky Limit
Question No. 11
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Which instrument is used to measure the oxygen diffusion rate (ODR) in soil?
A.
Pycnometer
B.
Platinum wire electrode
C.
Liquid limit device
D.
Munsell color chart
Question No. 12
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What does the term 'soil consistency' refer to?
A.
Resistance of soil to mechanical stress at various moisture contents
B.
The arrangement of soil particles
C.
The size distribution of soil particles
D.
The color of the soil
Question No. 13
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Which soil type is generally considered 'light' soil?
A.
Clay soil
B.
Sandy soil
C.
Silty soil
D.
Loamy soil
Question No. 14
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What is the approximate particle density of most soils?
A.
1.65 g/cm³
B.
2.65 g/cm³
C.
3.65 g/cm³
D.
4.65 g/cm³
Question No. 15
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Which of the following is NOT a primary component of soil?
A.
Mineral matter
B.
Organic matter
C.
Air
D.
Rock
Question No. 16
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Which soil property is most affected by tillage practices?
A.
Texture
B.
Structure
C.
Particle density
D.
Mineral composition
Question No. 17
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What is the significance of the plasticity index in soil science?
A.
It indicates the range of moisture content for plastic behavior
B.
It measures the soil's ability to retain water
C.
It determines the soil's nutrient content
D.
It classifies the soil's color
Question No. 18
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If a soil has a high percentage of clay particles, it is likely to have:
A.
Low water retention
B.
High bulk density
C.
High porosity
D.
Low thermal conductivity
Question No. 19
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The rate of heat flow through a unit cross-section of soil is known as:
A.
Specific heat
B.
Thermal conductivity
C.
Redox potential
D.
Bulk density
Question No. 20
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Which soil type is most suitable for groundnut cultivation?
A.
Clay soil
B.
Sandy soil
C.
Silty soil
D.
Loamy soil
Question No. 21
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Which soil property is measured using a hydrometer?
A.
Soil color
B.
Soil texture
C.
Soil structure
D.
Soil density
Question No. 22
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What is the primary difference between 'peds' and 'clods' in soil structure?
A.
Peds are natural aggregates, while clods are formed artificially
B.
Peds are smaller than clods
C.
Peds are more compact than clods
D.
Peds are more porous than clods
Question No. 23
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Which of the following is NOT a characteristic of loamy soils?
A.
Good water retention
B.
Excellent drainage
C.
High clay content
D.
Suitable for most crops
Question No. 24
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Which soil type is best suited for rice cultivation?
A.
Sandy soil
B.
Clay soil
C.
Silty soil
D.
Loamy soil
Question No. 25
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What does the 'hue' in the Munsell color chart represent?
A.
Lightness of the color
B.
Purity of the color
C.
Dominant spectral color
D.
Saturation of the color
Question No. 26
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Which soil component has the highest specific heat?
A.
Mineral matter
B.
Organic matter
C.
Water
D.
Air
Question No. 27
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What is the effect of adding organic matter to soil on bulk density?
A.
Increases bulk density
B.
Decreases bulk density
C.
Has no effect on bulk density
D.
Increases particle density
Question No. 28
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Which soil property is most closely related to the ease of tillage?
A.
Texture
B.
Structure
C.
Color
D.
Consistency
Question No. 29
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What is the typical bulk density of most soils?
A.
0.66 g/cm³
B.
1.33 g/cm³
C.
2.66 g/cm³
D.
3.99 g/cm³
Question No. 30
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Which factor has the LEAST influence on soil thermal conductivity?
A.
Soil moisture content
B.
Soil texture
C.
Soil color
D.
Organic matter content
Question No. 31
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Which component makes up the largest percentage of soil?
A.
Mineral
B.
Water
C.
Organic matter
D.
Air space
Question No. 32
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What is the percentage of organic matter in soil?
A.
5%
B.
10%
C.
15%
D.
20%
Question No. 33
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How much air space is present in soil?
A.
20%
B.
25%
C.
30%
D.
35%
Question No. 34
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How much water is typically found in soil?
A.
20%
B.
25%
C.
30%
D.
35%
Question No. 35
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What type of soil texture refers to the size of soil particles?
A.
Soil structure
B.
Soil texture
C.
Soil composition
D.
Soil consistency
Question No. 36
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Which of the following is not a type of soil particle?
A.
Water
B.
Clay
C.
Silt
D.
Sand
Question No. 37
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What method is used to analyze the mechanical composition of soil particles?
A.
Pycnometer method
B.
Hydrometer method
C.
Tillage method
D.
Sieve analysis
Question No. 38
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What size of soil particles is considered gravel according to IISS classification?
A.
0.2 - 2.0 mm
B.
> 2.0 mm
C.
0.02 - 0.2 mm
D.
< 0.002 mm
Question No. 39
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Which soil type is categorized by having more than 85% sand?
A.
Clay soil
B.
Silty soil
C.
Sandy soil
D.
Loamy soil
Question No. 40
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What soil type is suitable for most crops due to its balance of water retention and nutrient-holding capacity?
A.
Silty soil
B.
Loamy soil
C.
Clay soil
D.
Sandy soil
Question No. 41
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Which soil type retains the most water and nutrients?
A.
Sandy soil
B.
Loamy soil
C.
Clay soil
D.
Silty soil
Question No. 42
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What is a characteristic of light soils like sandy soil?
A.
High moisture retention
B.
Low resistance to tillage
C.
High nutrient retention
D.
High cohesion
Question No. 43
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Which soil is best for growing cotton and rice?
A.
Sandy soil
B.
Loamy soil
C.
Clay soil
D.
Peaty soil
Question No. 44
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Which soil type is considered 'heavy' due to its fine texture and resistance to tillage?
A.
Clay soil
B.
Loamy soil
C.
Silty soil
D.
Sandy soil
Question No. 45
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What is the best soil structure for crop cultivation?
A.
Crumb structure
B.
Blocky structure
C.
Platy structure
D.
Prismatic structure
Question No. 46
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What is the range of Redox potential (Eh) for well-drained soils?
A.
200 to 300 mv
B.
400 to 700 mv
C.
-250 to -350 mv
D.
500 to 800 mv
Question No. 47
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What is the unit for measuring specific heat of soil?
A.
g/cm³
B.
cal/g
C.
g/ml
D.
kg/m³
Question No. 48
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What is the particle density of soil?
A.
1.33 g/cm³
B.
2.65 g/cm³
C.
0.2 g/cm³
D.
2.0 g/cm³
Question No. 49
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What type of soil exhibits plasticity when it contains more than 15% clay?
A.
Sandy soil
B.
Silty soil
C.
Clay soil
D.
Loamy soil
Question No. 50
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What is the lower plastic limit of soil?
A.
The moisture content at which soil is wet
B.
The moisture content at which soil can be deformed without cracking
C.
The moisture content at which soil becomes non-plastic
D.
The moisture content when soil aggregates break
Question No. 51
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Which of the following affects the plasticity of soil?
A.
Clay content
B.
Sand content
C.
Water content
D.
All of the above
Question No. 52
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What is the effect of adding organic matter on soil's thermal conductivity?
A.
It increases thermal conductivity
B.
It has no effect
C.
It decreases thermal conductivity
D.
It increases moisture retention
Question No. 53
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What is the main factor affecting the oxygen diffusion rate (ODR) in soil?
A.
Soil texture
B.
Soil colour
C.
Soil temperature
D.
Soil moisture content
Question No. 54
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Which soil type has the highest thermal conductivity?
A.
Clay soil
B.
Loamy soil
C.
Sandy soil
D.
Peaty soil
Question No. 55
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What does the Munsell colour chart determine about soil?
A.
Water content
B.
Soil texture
C.
Soil consistency
D.
Soil colour
Question No. 56
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Which soil structure is most likely to have a granular shape?
A.
Spheroid
B.
Blocky
C.
Crumb
D.
Platy
Question No. 57
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What does bulk density refer to in soil?
A.
Density of soil particles
B.
The ratio of soil weight to its bulk volume
C.
Soil's thermal conductivity
D.
Soil's plasticity
Question No. 58
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Which soil type has the least resistance to tillage?
A.
Clay soil
B.
Sandy soil
C.
Loamy soil
D.
Peaty soil
Question No. 59
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Which of the following soils has high cohesion and stickiness?
A.
Sandy soil
B.
Clay soil
C.
Loamy soil
D.
Silty soil
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