soil science MCQs – Page 5

Practise focused soil science questions with marked answers for exam preparation and subject revision.

soil science Mcqs

81. Biological Weathering involves:
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A. Micro- organisms

B. Man and Animals

C. Higher Plants and Roots

D. All of these

82. Small rivulets or finger like channels formed on the surface of earth by action of water, these channels are of small depth & can be leveled by tillage operations is:
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A. Sheet erosio.

B. Gully erosion

C. None of these

D. Stream bank erosion

83. Integrated Nutrient Management (INM) is a well-accepted approach for the sustainable management of________?
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A. Soil Productivity

B. Increased crop production

C. both a and B

D. None of these

84. The internal & external surfaces of soil colloids are positively and or negatively charged. Mostly ____________ is dominant:
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A. Negative

B. Zero

C. All of the above

D. Positive

85. Process of mixing of soils is known as_________?
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A. The correct option is not present above

B. Laterization

C. Lessivage

D. Gleization

86. Which of the following nutrient elements are regarded as energy exchangers:
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A. Hydrogen

B. Oxygen

C. Both A & B

D. None of these

87. 1 meq of HCl is equal to_________?
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A. 14 mg of N

B. 140 mg of N

C. 0.14 mg of N

D. 1.4 mg of N

88. Soil is a variable mixture of Major components:
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A. Solids

B. Gases

C. All of the above

D. Liquids

89. The deficient macronutrient in the sodic soils is:_______?
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A. Cu

B. Mg

C. Mo

D. Ca

90. Although some acid soils do exist in the northern mountainous regions of Pakistan (Mansehra, Sawat, Dir). Almost all cultivated soils of the country are ________________, with high base saturation and low organic matter content (generally less than 1%)?
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A. Alkaline

B. Very much acidic

C. Calcareous

D. both A & C

91. Which bacteria convert nitrite to nitrate___________________?
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A. Pseudomonas

B. Frankia

C. Nitrobacter

D. None of the above

92. The suitable species for reclamation of saline & sodic soil is:__________?
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A. Casuarina equisetifolia

B. Albizia lebbeck

C. Both A & B

D. None of the above

93. The unit of a scale used to measure the level of acidity or alkalinity of chemicals is called:
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A. Ec

B. Pascal

C. pH

D. None of the above

94. Walkley and blacks method of organic matter determination allows recovery of ______ ? organic carbon content:
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A. 45 ?

B. 33?

C. 44 ?

D. None of the above

95. Inorganic constituents vary in size from fine clay particles _________ mm to large _________ mm gravel and rock:
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A. None of the above

B. 0.02 mm- 0.2 mm

C. < 0.002 mm- >2 mm

D. 0.5 mm 1.0 mm

96. The process of transformation of raw organic matter into humus:
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A. Illuviation

B. Humification

C. Calcification

D. Horizonation

97. The virus infecting bacteria is called:_________?
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A. Bacteriophage

B. Bacteroid

C. Bacterin

D. All of these

98. Nitrogen fixation is accomplished by:_________?
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A. Bacteria from atmosphere

B. None of these

C. Plants

D. Fungi

99. In Pakistan, approximately __________ mha of irrigated land is affected by salinization:
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A. 8.2 mha

B. None of the above

C. 12.6 mha

D. 5.7 mha

100. What is the pH of calcareous soils?
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A. 6.5-7.5

B. 8.5-9.0

C. 8.0-8.5

D. 7.0-7.5

Showing 81 to 100 of 503 mcqs