Agriculture MCQs with Answers – Practice Online – Page 34

Question 661 Water Management

What is the masonry or concrete wall built at 90° to the weir axis to separate the main weir from the under-sluices called?

Correct answer C. Divide wall

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Question 662 Soil Science

What is the planned development, distribution and use of water resources called?

Correct answer B. Water management

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Question 663 Soil Science

Conservation agriculture improves water use efficiency in dryland systems. Which of these are its components?

Correct answer D. All of the above

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Question 664 Water Management

A fish ladder dissipates flow energy so that fish downstream can move upstream easily. Within what range does the flow velocity in it lie?

Correct answer B. 3.0 – 3.5 m/sec

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Question 665 Water Management

To stop floodwater spilling over the gates, a wall resting on piers is built from pond level to high flood level along the regulator and resists water pressure by its weight. What is it called?

Correct answer D. Breast wall

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Question 666 Soil Science

The availability of essential nutrients from soil to plants is controlled by which soil properties?

Correct answer B. Chemical

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Question 667 Water Management

What are structures built on the river bed just upstream of a canal head regulator, so that only clearer water enters the canal, called?

Correct answer B. Silt excluders

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Question 668 Soil Science

Which of the following statements is wrong?

Correct answer A. Sandy soils have a higher sand percentage and more water-holding capacity

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Question 669 Soil Science

Which of the following soil orders does NOT occur in Pakistan?

Correct answer D. None of the above

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Question 670 Water Management

In a hydraulic jump, the depth before the jump is called the initial depth. What is the depth after the jump called?

Correct answer D. Sequent depth

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Question 671 Soil Science

The internal and external surfaces of soil colloids carry positive and negative charges. Which charge is usually dominant?

Correct answer A. Negative

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Question 672 Water Management

Hydraulic structures built on which soils most often fail because of undermining and uplift pressure?

Correct answer B. Permeable

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Question 673 Water Management

At the end of a hydraulic structure, when the upward force of subsoil water just equals the submerged weight of the soil grains, what is the exit gradient called?

Correct answer B. Critical exit gradient

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Question 674 Soil Science

Each layer of a phyllosilicate is made of which two types of sheet?

Correct answer D. Both A and C

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Question 675 Water Management

Hydraulic structures today are designed using flow net theory. Who gave this theory?

Correct answer C. Khosla

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Question 676 Soil Science

Soil organic matter, which supplies macro- and micronutrients, contains about what percentage of organic carbon?

Correct answer C. 58%

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Question 677 Water Management

To prevent scouring at the end of a hydraulic structure, what must be provided at the exit point?

Correct answer D. Vertical cutoff

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Question 678 Soil Science

What is a mineral surface horizon that is too thin, too light in colour or too low in organic matter to qualify as a mollic or umbric epipedon called?

Correct answer A. Ochric epipedon

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Question 679 Water Management

For a strong hydraulic jump that dissipates maximum energy, at what slope should the downstream glacis be built?

Correct answer A. 3:1 to 5:1

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Question 680 Soil Science

Which nutrient elements are regarded as energy exchangers?

Correct answer C. Both A & B

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