Inorganic soil constituents range in size from fine clay particles of ____ to gravel and rock of ____. Which pair completes this?
Correct answer A. < 0.002 mm- >2 mm
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Agriculture MCQs
Page 41 of Agriculture multiple-choice questions with answers. Tap an option to check yourself.
Page 41 of 135
If E1 is the specific energy before a hydraulic jump and E2 the energy after it, how is the efficiency of the jump given?
Correct answer B. E2 / E1
What is the surface loss of ice or snow from a glacier or snowfield by melting, sublimation or calving called?
Correct answer B. Ablation
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By what force is water held in the soil pores of the root zone against gravity, forming capillary water?
Correct answer C. Capillary force
What is any tillage and planting system that leaves at least 30 percent of the soil surface covered with crop residue after planting, to reduce water erosion, called?
Correct answer C. Conservation tillage
Waterlogging is the condition in which the water table rises to what position relative to the root zone of plants?
Correct answer C. Within
Which types of check dam have been tried in Pakistan?
Correct answer D. All of the above
In Kennedy’s silt theory, the critical velocity is proportional to which power of the depth of flow?
Correct answer A. D^0.64
What is the scale used to measure the acidity or alkalinity of a substance called?
Correct answer A. pH
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What are canals called that are dug directly from a river without a head regulator?
Correct answer C. Inundation canals
Which soil, regarded as ideal, is a mixture of sand, silt and clay?
Correct answer C. Loam
On what does the discharge carrying capacity of an irrigation channel depend?
Correct answer A. Channel dimensions
By which kinds of waste is available soil being polluted quickly?
Correct answer D. All of the above
An earth dam founded on cohesionless silt must be analysed for stability against what?
Correct answer B. Shear
What term describes the capacity of a soil to function on a sustained basis while promoting plant and animal health?
Correct answer B. Soil quality
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What is the minimum factor of safety against overturning in a gravity dam?
Correct answer D. 1.5
Organic matter decomposes rapidly in Pakistani soils, which usually hold less than 1 percent organic matter. Which conditions cause this?
Correct answer B. Both a & b
What is the ratio of the rate of change of discharge of an outlet to the rate of change of discharge of the distributary called?
Correct answer A. Flexibility
What always causes soil quality to deteriorate?
Correct answer D. All of these
Which soil order includes new soils with little or no profile development?
Correct answer A. Entisols