After a weir is built, the downstream river bed keeps eroding and gradually lowers. What is this process called?
Correct answer C. Retrogression
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Agriculture MCQs
Page 35 of Agriculture multiple-choice questions with answers. Tap an option to check yourself.
Page 35 of 135
Which element is known as the chemical policeman of the plant?
Correct answer B. Potassium
In Lacey’s wetted perimeter formula used for a weir waterway, P = ____ (Q)1/2. What is the constant?
Correct answer A. 4.75
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Which organisms carry out the decomposition of organic matter in submerged soils?
Correct answer D. None of the above
What is the pool built downstream of a hydraulic structure to dissipate the energy of falling water by providing a water cushion called?
Correct answer A. Cistern
Who discovered blue-green algae (BGA) as nitrogen fixers in paddy fields?
Correct answer A. P.K dey
What is a module or outlet called whose discharge depends on the difference in head between the distributary and the watercourse?
Correct answer A. Non-modular
Which has the higher specific heat?
Correct answer B. Humus
Which element is most abundant in the Earth’s crust?
Correct answer D. None of the above
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What is an outlet whose discharge depends on the water level in the distributary called?
Correct answer B. Flexible module
What is the ratio of the rate of change of discharge through an outlet to the rate of change of water level in the distributary called?
Correct answer D. Sensitivity
When the canal’s full supply level is well below the bottom of the drain, so the drain water flows freely under gravity over the canal, what is the structure called?
Correct answer B. Super-passage
What structure is provided where a large canal and a big drainage channel meet at practically the same level?
Correct answer C. Level crossing
Between which limits is plant-available water held in soil?
Correct answer A. Field capacity to wilting point
What is an open cut in a canal bank, with a bed and sides, that releases canal water through a lead channel into a nearby drain called?
Correct answer A. Outlet
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What is the process by which nutrients, chemicals or contaminants are dissolved and carried away by water or moved into a lower soil layer called?
Correct answer C. Leaching
What is the maximum permissible total dissolved solids in drinking water?
Correct answer B. 1500 mg/litre
Who study the properties of soil in relation to plant production?
Correct answer B. Edaphologists
What is the property called when one soil erodes more readily than another under the same conditions?
Correct answer D. Erodibility
What are the A and B horizons together called?
Correct answer A. Solum