Agriculture MCQs with Answers – Practice Online – Page 32

Question 621 Water Management

What is the science of water that deals with the depletion and replenishment of water resources called?

Correct answer A. Hydrology

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Question 622 Soil Science

In what proportion does potassium (K) occur in the earth’s crust?

Correct answer B. 2.3 %

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Question 623 Water Management

What is the maximum rate at which a soil in a given condition can absorb water called?

Correct answer A. Infiltration capacity

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Question 624 Soil Science

Oxygen and silicon together make up approximately what percentage of the Earth’s crust?

Correct answer B. 75 %

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Question 625 Water Management

Field capacity is the water a saturated soil holds after gravity drainage. What is the amount of water needed to bring soil moisture up to field capacity called?

Correct answer D. A and B are correct

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Question 626 Soil Science

What is the relative abundance of igneous, metamorphic and sedimentary rocks in the Earth’s crust?

Correct answer D. 64.7% - 27.4% - 7.9%

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Question 627 Water Management

At the start of rainfall, when soil moisture in the root zone is very low, how does the rate of infiltration behave?

Correct answer D. Increases

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Question 628 Soil Science

Which of the following is not a loss of soil water?

Correct answer D. Hydroponics loss

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Question 629 Water Management

Artificial rain tests are sometimes carried out to mimic actual field conditions more closely. What instrument is used?

Correct answer C. Rain simulator

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Question 630 Water Management

During a river’s peak stage, water flows from the river into the groundwater reservoir. What is the river called in this case?

Correct answer C. Influent stream

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Question 631 Soil Science

Which type of erosion removes a thin layer of soil evenly over the whole surface, and has eroded some fertile sloping land to a depth of about 15 cm?

Correct answer D. Sheet erosion

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Question 632 Water Management

Water evaporating from paddy fields collects in the atmosphere as water vapour. How does this vapour behave?

Correct answer A. Gas

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Question 633 Soil Science

Where should soil samples be collected from?

Correct answer D. None of these

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Question 634 Water Management

When the atmosphere is fully saturated with water vapour, what is the pressure exerted by the vapour in that air called?

Correct answer A. Saturation pressure

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Question 635 Soil Science

Clay and humus particles smaller than 0.002 mm are called colloids. What kind of surface area do they have, which provides sites for adsorption, catalysis and microbial colonisation?

Correct answer C. Extremely high

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Question 636 Soil Science

What pF value corresponds to the tension of water at the upper plastic limit?

Correct answer C. 0.5

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Question 637 Water Management

What is the moisture content of air called when it is expressed as weight per unit volume?

Correct answer D. Absolute Humidity

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Question 638 Soil Science

What is the percentage of calcium in single superphosphate?

Correct answer C. 19.5%

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Question 639 Water Management

A cloud forms by condensation and consists of small ice particles and water droplets. About what diameter in microns are these droplets?

Correct answer C. 40

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Question 640 Soil Science

What does groundwater study chiefly involve?

Correct answer D. Aquifer location

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