agriculture MCQs – Page 35

Practise multiple-choice questions from agriculture for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

681. A particular flood which can occur in the basin in the worst meteorological and hydrological conditions is called ___________________?
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A. Maximum probable flood

B. Storm water flood

C. Very high flood

D. Standard flood

682. Botanical name of American cotton is_________________?
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A. G. hirsutum

B. G. arborium

C. G. barb dense

D. Non of these

683. The hydraulic structures like dams, barrages constructed on permeable foundations are likely to fail due to ___________________?
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A. All the above

B. Sliding

C. Piping

D. Crushing

684. According to Mr. Khosla, the seeping water creates undermining and the undermining starts from__________________?
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A. Bottom to top

B. Up stream to down stream

C. Top to bottom

D. Down stream to up stream
685. The hydraulic jump is formed on down stream of toe of glacis for the purpose to dissipate surplus energy of the flowing water, the nature and strength of jump depends upon a Number called______________________?
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A. Darcy,s law

B. Froude No

C. Reynolds

D. Webber

686. The mass per unit volume of a liquid at standard temperature and pressure is called ____________________?
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A. Specific weight

B. Specific gravity

C. Mass density

D. None of these

687. Barani Agriculture institute is located at _________________?
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A. Islamabad

B. Rawalpindi

C. Chakwal

D. Peshawar

688. A structure provided when a large canal a big drainage channel approach other practically at the same level is called__________________?
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A. Drainage crossing

B. Level crossing

C. Canal crossing

D. Super passage

689. If a river or stream is collecting sediment and is building up dunes in its bed is called ______________________?
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A. Aggrading river

B. Sediment river

C. Stable river

D. Sub-stable river

690. Which of the following has highest-coefficient of discharge_____________________?
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A. Cippoletti weir

B. Venturi meter

C. Broad crested weir

D. Sharp edged orifice

691. The specific weight of water at normal pressure of 760 mm, 4C temperature and at mean sea level is ______________________?
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A. 1020kg/m3

B. 1000ka/m3

C. 1100kg/m3

D. 960kg/m3

692. Water logging caused by ____________ water, which during excessive irrigation percolates down and join under ground water table?
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A. Free

B. Hygroscopic

C. Gravity

D. Capillary

693. At the end of hydraulic structure, the upward force of sub-soil water just becomes equal to the submerged weight of soil grains Then exit gradient will be called______________?
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A. Balanced exit gradient

B. Submerged exit gradient

C. All are correct

D. Critical exit gradient
694. When ever a body is immersed wholly or partially in water, it is lifted up by a force equal to the weight of water displaced by the body ?
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A. Law of gravity

B. Newtons law of otion

C. Archimeds Principle

D. None of these

695. Mostly the hydraulic structures founded on ____________ soils fails because of undermining and uplift pressure?
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A. Stable

B. Rocky

C. Impermeable

D. Permeable
696. Weedicides that kill the foliage of weeds by direct contact are as________________?
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A. Bromoxy nil

B. Loxynil

C. Paraquet

D. Trifluration

697. The experimental design which control fertility level in two directions is known as________________?
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A. SPD

B. LSD

C. RBD

D. AD

698. The force with which the distinct bodies held together when their surfaces are brought in contact to each other is called _________________?
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A. Adhesion

B. Surface tension

C. Cohesion

D. All are correct

699. The loss of head H/ L is proportional to the length of creep. There fore the loss of head per unit creep length is called ______________________?
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A. Hydraulic gradient

B. Head loss

C. Exit gradient

D. Creep length

700. The structures, which are constructed on the river bed upstream of head regulator. With this clear water enters in canal such structures are called______________________?
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A. Silt control structures

B. Vortex pipes

C. Silt ejectors

D. Silt excluders