Agriculture MCQs with Answers – Practice Online – Page 38

Question 741 Water Management

When a fast, shallow stream of water on the downstream side of a sloping glacis meets a slow, deep stream, the water surface rises abruptly. What is this called?

Correct answer B. Hydraulic jump

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Question 742 Soil Science

Soil erosion involves which processes of soil by natural agents such as wind and water?

Correct answer C. Both A and B

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Question 743 Soil Science

What are Fe, Zn, Mn, Mo, Co, Ni and Cu also called?

Correct answer C. Both A & B

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Question 744 Water Management

What is the design condition called when a high flood passes over a weir, creating high uplift pressures while the canals carry no flow?

Correct answer C. Worst condition

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Question 745 Soil Science

What are calcium, magnesium and sulphur called?

Correct answer D. None of these

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Question 746 Water Management

What is the water-control structure at the head of a canal that supplies water from the parent canal to a branch channel called?

Correct answer C. Head Regulator

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Question 747 Water Management

What are the works built along a river to guide its flow and pass it safely through hydraulic structures called?

Correct answer C. River training works

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Question 748 Soil Science

Apart from its rocky mountains, Balochistan also has deserts where wind erosion occurs. Where are they?

Correct answer C. Both A & B

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Question 749 Soil Science

What type of erosion forms small, finger-like channels of shallow depth that can be smoothed out by tillage?

Correct answer D. None of these

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Question 750 Water Management

What are the sluices provided at upstream floor level in a weir to flush out deposited sediment called?

Correct answer C. Scouring sluices

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Question 751 Soil Science

What are the two broad types of soil erosion?

Correct answer C. Normal (geological) erosion and accelerated erosion

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Question 752 Water Management

What is the water level needed on the upstream side of a canal head regulator to feed the off-taking canal with its full supply called?

Correct answer A. Pond level

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Question 753 Water Management

The downstream sloping glacis of a hydraulic structure is designed to form what automatically and dissipate the surplus energy of flowing water?

Correct answer B. Hydraulic jump

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Question 754 Soil Science

Which of the following is not a principle of soil conservation?

Correct answer A. Leave barren lands uncultivable to support desertification degradation

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Question 755 Water Management

What is a weir called whose own weight balances the uplift pressure from water seeping beneath its floor?

Correct answer B. Gravity weir

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Question 756 Soil Science

What are the causes of soil erosion?

Correct answer D. All of these

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Question 757 Soil Science

Which chemical is used to reduce evaporation from the surface of water bodies?

Correct answer A. Cetyl alcohol

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Question 758 Water Management

What is a groyne pointing downstream, in the direction of river flow, called?

Correct answer C. Attracting

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Question 759 Water Management

In an alluvial river, centrifugal force causes scouring on the concave bank and silting on the convex bank, developing bends. What is this process called?

Correct answer D. Meandering

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Question 760 Soil Science

What is the evolution of new species called?

Correct answer B. Speciation

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