Soil Science 5
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Question No. 1
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Which Indian state has the highest concentration of acidic soils?
A.
West Bengal
B.
Kerala
C.
Tamil Nadu
D.
Karnataka
Question No. 2
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What contributes to the acidity in acidic soils?
A.
Presence of excess calcium carbonate
B.
Adsorption of Al3+, Fe2+, and Mn ions
C.
High concentration of sodium ions
D.
Accumulation of organic matter
Question No. 3
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Which material is used for managing acidic soils?
A.
Gypsum
B.
Lime
C.
Sodium bicarbonate
D.
Potassium chloride
Question No. 4
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What is another name for saline soils due to their appearance?
A.
Black alkali
B.
Red loam
C.
White alkali
D.
Sandy loam
Question No. 5
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Which ions are predominantly found in saline soils?
A.
Potassium and magnesium
B.
Calcium and sodium chlorides and sulfates
C.
Nitrates and phosphates
D.
Iron and aluminum
Question No. 6
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What is used to measure soil salinity?
A.
pH
B.
EC
C.
ESP
D.
CEC
Question No. 7
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Where are saline soils commonly found?
A.
Humid and tropical regions
B.
Arid and semi-arid zones
C.
Mountainous regions
D.
Coastal areas
Question No. 8
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How are saline soils reclaimed?
A.
Adding gypsum
B.
Leaching with good quality irrigation water
C.
Applying lime
D.
Planting nitrogen-fixing crops
Question No. 9
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What is a recommended practice for managing saline soils?
A.
Frequent irrigation
B.
Adding organic matter (FYM)
C.
Avoiding irrigation
D.
Applying large amounts of fertilizer
Question No. 10
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Which element's toxicity is a concern in alkaline soils?
A.
Iron
B.
Boron
C.
Nitrogen
D.
Phosphorus
Question No. 11
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What is the color of alkaline soils?
A.
Red
B.
Black
C.
Brown
D.
Grey
Question No. 12
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What contributes to the alkalinity in alkaline soils?
A.
Excess calcium ions
B.
High organic matter content
C.
Excess sodium carbonate and bicarbonate
D.
Presence of heavy metals
Question No. 13
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Which fertilizer is recommended for alkaline soils instead of urea?
A.
Potassium chloride
B.
Diammonium phosphate (DAP)
C.
Ammonium sulfate
D.
Urea
Question No. 14
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Which material is used for reclaiming alkali soils with pH > 8.5?
A.
Lime
B.
Gypsum
C.
FYM
D.
Compost
Question No. 15
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What is the recommended application rate of gypsum for reclaiming alkali soils?
A.
4 qt/ha
B.
8 qt/ha
C.
12 qt/ha
D.
16 qt/ha
Question No. 16
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Which material can be used as an amendment for alkali soils?
A.
Lime
B.
Iron pyrite (FeS2)
C.
Potassium chloride
D.
Sodium bicarbonate
Question No. 17
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Which practice is beneficial for reclaiming alkali soils?
A.
Green manuring
B.
Applying chemical fertilizers
C.
Leaving the land fallow
D.
Intensive tillage
Question No. 18
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Which crop is relatively salt-sensitive?
A.
Barley
B.
Rice
C.
Groundnut
D.
Cotton
Question No. 19
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Which crop is considered highly salt-tolerant?
A.
Rice
B.
Wheat
C.
Barley
D.
Gram
Question No. 20
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Why is gypsum not recommended for saline soils?
A.
It is too expensive
B.
Sulfate in gypsum can increase salt concentration
C.
It makes the soil more alkaline
D.
It is difficult to apply
Question No. 21
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What are substances that improve soil physical and chemical properties called?
A.
Fertilizers
B.
Pesticides
C.
Soil amendments
D.
Herbicides
Question No. 22
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What is the pH range for saline soils?
A.
< 8.5
B.
> 8.5
C.
Around 7
D.
Variable
Question No. 23
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What is the EC value (in ds/m) for saline soils?
A.
< 4
B.
> 4
C.
Around 4
D.
Variable
Question No. 24
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What is the ESP value for alkaline soils?
A.
< 15
B.
> 15
C.
Around 15
D.
Variable
Question No. 25
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Which type of soil water is held mostly by soil colloids?
A.
Capillary water
B.
Gravitational water
C.
Hygroscopic water
D.
Combined water
Question No. 26
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What is the tension range for hygroscopic water?
A.
0.3 to 31 atm
B.
< 0.3 atm
C.
31 to 10,000 atm
D.
> 10,000 atm
Question No. 27
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Which form of soil water is mostly available to crops?
A.
Hygroscopic water
B.
Capillary water
C.
Gravitational water
D.
Runoff water
Question No. 28
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What is the tension range for capillary water?
A.
< 0.3 atm
B.
0.3 to 31 atm
C.
> 31 atm
D.
Variable
Question No. 29
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Which type of soil water is also called drainage water?
A.
Hygroscopic water
B.
Capillary water
C.
Gravitational water
D.
Adsorbed water
Question No. 30
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Which of the following is true about acidic soils in India?
A.
Acidic soils are primarily found in Punjab.
B.
West Bengal has the highest concentration of acidic soils.
C.
Acidity in soils is caused by adsorption of Na+ ions.
D.
Acidic soils are typically found in arid and semi-arid regions.
Question No. 31
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Which of the following is used to reclaim saline soils?
A.
Flooding with saline water.
B.
Frequent irrigation with high-EC water.
C.
Leaching of soluble salts using good irrigation water.
D.
Addition of gypsum without irrigation.
Question No. 32
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What is the main characteristic of alkaline soils?
A.
Presence of excess NaCO3 and NaHCO3 ions.
B.
Low pH due to high soluble salts.
C.
Found in humid regions.
D.
Sodium toxicity is absent in alkaline soils.
Question No. 33
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Which of the following should be used in alkali soils instead of urea?
A.
NPK fertilizers
B.
DAP or CAN
C.
Potash fertilizer
D.
Superphosphate
Question No. 34
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Which of the following is an example of a highly salt-tolerant crop?
A.
Wheat
B.
Pomegranate
C.
Sunhemp
D.
Barley
Question No. 35
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Which of the following is NOT a method for reclaiming alkali soils?
A.
Addition of gypsum.
B.
Use of iron pyrite.
C.
Addition of organic manure.
D.
Application of salt.
Question No. 36
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Which of the following soil amendments is commonly used for improving soil fertility and structure?
A.
NPK Fertilizer
B.
Gypsum
C.
Muriate of Potash
D.
Cement
Question No. 37
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What is the physical classification of water held by soil colloids?
A.
Capillary water
B.
Gravitational water
C.
Hygroscopic water
D.
Drainage water
Question No. 38
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In saline-alkali soils, which of the following ions causes toxicity?
A.
Ca+2
B.
Na+
C.
Cl-
D.
SO4-2
Question No. 39
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Which of the following statements about saline soils is true?
A.
Saline soils have a pH greater than 8.5.
B.
Saline soils are characterized by a white crust of salts.
C.
Saline soils are common in humid regions.
D.
Saline soils are not suitable for agriculture under any circumstances.
Question No. 40
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Which of the following is the ideal EC level for saline soils?
A.
EC < 4 ds/m
B.
EC > 4 ds/m
C.
EC = 0
D.
EC > 10 ds/m
Question No. 41
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Which of the following crops is considered salt-sensitive?
A.
Date palm
B.
Rice
C.
Pomegranate
D.
Barley
Question No. 42
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Which soil type typically has a pH value greater than 8.5?
A.
Saline soils
B.
Alkaline soils
C.
Acidic soils
D.
Sodic soils
Question No. 43
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What is the main factor that leads to the formation of saline soils?
A.
High organic matter content
B.
Low levels of sodium and calcium ions
C.
Accumulation of soluble salts in the root zone
D.
Excess moisture in soil
Question No. 44
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Which of the following is the most suitable for managing salt-tolerant crops in saline soils?
A.
Fertility management only
B.
Leaching with excessive water
C.
Proper irrigation and soil amendments
D.
Avoiding crops altogether
Question No. 45
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Which of the following is a primary characteristic of hygroscopic water in soil?
A.
Held between field capacity and wilting point.
B.
Moves easily in the soil as liquid.
C.
Held tightly by soil colloids and is biologically inactive.
D.
Held at gravitational force.
Question No. 46
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Which crop is highly tolerant of saline conditions?
A.
Sunhemp
B.
Oats
C.
Wheat
D.
Moong
Question No. 47
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How does gypsum help in the reclamation of alkali soils?
A.
It increases the pH of the soil.
B.
It reduces the sodium content of the soil.
C.
It increases the organic matter of the soil.
D.
It raises the soil's phosphorus levels.
Question No. 48
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Which of the following statements about saline soil reclamation is correct?
A.
Flooding with high-salinity water is the most effective method.
B.
Leaching of soluble salts using good-quality irrigation water is the best method.
C.
Frequent irrigation with saline water is recommended.
D.
Gypsum is not recommended for saline soil management.
Question No. 49
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Which of the following ions is typically found in high concentrations in saline soils?
A.
Ca+2
B.
Na+
C.
Fe+2
D.
Mn+2
Question No. 50
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Which of the following is a primary factor causing alkaline soil formation?
A.
Excessive rainfall
B.
Accumulation of NaCO3 and NaHCO3 ions
C.
High organic matter content
D.
Excessive tillage
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