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100 Soil Science MCQs for Competitive Agriculture Exams

Byआदित्य अभिषेक

Hey students, preparing for your upcoming agriculture examinations but confused about whether your preparation is going well or not? Well, no more! At Agriculture Review, we keep updating new test series based on previous years’ questions of the Examination for Agriculturists.

In this test, you have to attempt 100 questions from the Soil Science subject. Attempting all questions is necessary to identify your strengths and weaknesses. After completing the test, you can take a screenshot of your result for future reference and compare it with past performances. To stay updated with regular test series, click on the bell icon at the bottom left corner of the screen.

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Soil Science MCQs

Soil Science MCQs

1. What does the term “pedology” primarily deal with?

2. What is the average percentage of mineral matter in soil by volume?

3. Which mineral group contains mica, illite, and montmorillonite?

4. Which of the following is classified as an intrusive igneous rock?

5. Which gas is present in the highest volume in the atmosphere?

6. What is the meaning of the Latin word “Solum” from which ‘soil’ is derived?

7. Which mineral is most resistant to weathering?

8. Which clay mineral is known for high swelling and shrinkage characteristics?

9. Which soil component acts like the brain in an animal system analogy?

10. Which scientist is known as the “Father of Soil Science”?

11. Which rock is formed by chemical precipitation of calcium carbonate?

12. The mineral “gibbsite” is a common form of:

13. Which process causes soil color to turn red due to oxidation of iron?

14. Which element dominates the Earth’s crust by weight?

15. The process of transformation of solid rocks into parent material is known as:

16. Which mineral among the following is a non-silicate?

17. Which of the following contributes to soil acidification through leaching?

18. Which layer of the Earth contains most of the soil-forming rocks?

19. What kind of silicate structure is found in amphiboles?

20. Which of the following is a ferric oxide that gives red color to soils?

21. Which of the following minerals is classified as a phyllosilicate?

22. Which sedimentary rock is mainly composed of calcium carbonate?

23. Which mineral group contributes to the yellow and brown soil colors?

24. Which process involves chemical breakdown of rocks by carbonic acid?

25. Which mineral in soils contains both calcium and magnesium carbonate?

26. What is the specific gravity range of Gabbro rock?

27. The double chain silicate structure is found in:

28. Which of the following is a major source of phosphorus in soils?

29. Which type of clay mineral is dominant in highly weathered tropical soils?

30. The mineral “goethite” is classified under which group?

31. Which one of the following is a precipitated salt found in soils?

32. Which metamorphic rock forms from the alteration of granite?

33. The chemical reaction where H2O molecules split mineral bonds is known as:

34. Which element substitution makes feldspar more prone to weathering?

35. Feldspar minerals belong to which structural silicate group?

36. Which mineral is primarily responsible for high CEC in black cotton soils?

37. Which of the following is a major limitation of gypsum in arid soils?

38. Which of the following clay minerals shows partial swelling?

39. Which mineral alteration indicates high weathering and leaching?

40. What is the approximate size limit (diameter) of clay particles?

41. What is the term used for water that is held tightly to soil particles and is unavailable to plants?

42. What is the field capacity of a soil?

43. Which form of soil water is readily available to plants?

44. Which instrument is commonly used to measure soil moisture tension?

45. The proportion of air-filled pores is maximum in which soil?

46. The thermal conductivity of soil is highest when:

47. Which gas increases in concentration in poorly aerated soils?

48. What does a high Cation Exchange Capacity (CEC) indicate in soil?

49. Which soil colloid has both permanent and pH-dependent charges?

50. What is the unit of Cation Exchange Capacity (CEC)?

51. Which soil component has the highest CEC per unit weight?

52. Which of the following soil colloids is crystalline in nature?

53. Which colloid type has the lowest surface area and CEC?

54. In soil colloids, negative charges arise primarily due to:

55. Which of the following anions is held most weakly in soils?

56. Which cation is adsorbed most strongly by soil colloids?

57. Which of the following represents anion exchange in soils?

58. What is the pH range at which most nutrients are optimally available?

59. Which of the following clay minerals has a 2:1 type structure?

60. Which of the following factors reduces the cation exchange capacity of soil?

61. Which component is considered the most stable part of soil organic matter?

62. The ideal carbon to nitrogen (C:N) ratio for rapid decomposition is around:

63. Which micro-organism is mainly responsible for nitrification in soil?

64. Humification is the process of:

65. Which organism group dominates soil biomass?

66. What is the role of earthworms in soil?

67. Which process converts organic nitrogen to ammonium?

68. Which of the following is a diagnostic surface horizon?

69. Which USDA soil order is characterized by permafrost?

70. Which of the following horizons accumulates illuvial clay?

71. Which soil order is dominant in dry desert regions?

72. Which horizon is defined as organic surface material?

73. Entisols are characterized by:

74. Which horizon generally shows maximum biological activity?

75. Which soil order is common in tropical rainforests and is highly weathered?

76. Spodic horizon is diagnostic for which soil order?

77. Which of the following soil orders has the highest fertility level?

78. Which soil order is most recent in formation?

79. Which diagnostic horizon is rich in organic carbon and calcium?

80. Which horizon is most affected by eluviation?

81. A soil is generally considered fertile when its base saturation is:

82. Which element is primarily responsible for soil acidity in clay colloids?

83. Exchangeable sodium percentage (ESP) is calculated as:

84. Which type of soil is most prone to nutrient leaching?

85. Which amendment is commonly used to reclaim sodic soils?

86. Liming an acid soil increases availability of:

87. What is the pH range of saline soils?

88. Which soil property is most important for nutrient retention?

89. In saline soils, the major soluble salt is usually:

90. Split application of fertilizers is recommended in:

91. Which element is most likely to leach from sandy soils?

92. Gypsum application to sodic soils helps mainly by:

93. Soil pH is defined as:

94. Which nutrient deficiency is commonly observed in strongly alkaline soils?

95. The nutrient most affected by soil pH changes is:

96. Which method is commonly used for determining soil pH in the lab?

97. Which soil test primarily determines available phosphorus?

98. The recommended soil pH range for most crop growth is:

99. Which practice is best to maintain soil organic matter and fertility?

100. Which factor is critical when making fertilizer recommendations from soil tests?

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