Soil and Water Conservation Engineering PDF

Soil and water Conservation Engineering, and Allied Subjects Prepared by: Guiller B. Damian Science Research Assistant Philippine-Sino Center for Agricultural Technology Agricultural Engineering And Mechanization Division...

Soil and water Conservation Engineering, and Allied Subjects Prepared by: Guiller B. Damian Science Research Assistant Philippine-Sino Center for Agricultural Technology Agricultural Engineering And Mechanization Division Central Luzon State University Munoz Nueva Ecija [email protected] Ratio of the dry weight of soil particles to the weight of an equal volume of water a. Particle Density b. Bulk Density c. Real specific Density d. Apparent specific density Answer – Real specific Density 09/19/21 07:01 PM 2 The moisture content of the soil when the gravitational water has been removed a. Available water b. Field Capacity c. Permanent wilting point d. Readily available moisture Answer - Field Capacity 09/19/21 07:01 PM 3 Applying a small amount of water through a network of tubing. a. Drip irrigation b. Emitter irrigation c. Trickle irrigation d. All of the above Answer – all of the above 09/19/21 07:01 PM 4 Water that moves freely and drains out of the soil. a. Hygroscopic water b. Capillary water c. Gravitational water d. none Answer - Gravitational water 09/19/21 07:01 PM 5 The pressure under a gravity dam producing an overturning effect a. Uplift pressure b. Downward pressure c. Foundation Pressure d. None of the above Answer - Foundation Pressure 09/19/21 07:01 PM 6 The most elaborate method of computing potential Evapotranspiration a. Blaney-craddle b. Jensen-haise c. hargreaves d. None of the above Answer – None (penman) 09/19/21 07:01 PM 7 Method of supplying water in the basin a. Direct and cascade supply b. Flooding and pumping c. Sprinkling and dripping d. None of the above Answer - Direct and cascade supply 09/19/21 07:01 PM 8 Given the following bed slope = 0.0003 manning constant, n= 0.03 b/d ratio = 3.5 wetted perimeter = 14 z =0.5. The velocity of flow along a trapezoidal canal is?. a. 8.2 m/s b. 0.82 m/s c. 82 m/s d. 0.082 m/s Answer - 0.82 m/s 09/19/21 07:01 PM 9 Banawe rice terraces is a. a. Broad base terrace b. Conservation terrace c. Bench terrace d. All of the above Answer- Bench terrace 09/19/21 07:01 PM 10 It is practice of growing alternate strips of different crops on the same field. a. stripping b. Strip tease c. sprigging d. None of the above Answer – none ( strip cropping) 09/19/21 07:01 PM 11 Given the following data of confined aquifer. Thickness, b=5m, well diameter =40 cm radius of influence= 250 m, k = 10 mm/day height of water in pumping well =1,325 m, height of piezometer surface = 1,500 m the steady state discharge is? a. 0.89 m3/sec b. 0.089 m3/sec c. 0.89 Liter/sec d. 0.089 Liter/sec Answer – 0.089 m3/sec 09/19/21 07:01 PM 12 The relative proportion of sand, silt and clay determine the. a. Soil texture b. Soil particles c. Soil profile d. Soil structures e. Soil taxonomy Answer – soil texture 09/19/21 07:01 PM 13 The soil contain more or less equal amounts of sand, silt and clay? a. Acid soil b. Volcanic soil c. Alkaline soil d. None of the above Answer – None of the above (loam soil) 09/19/21 07:01 PM 14 A vertical section to the soil mass where significant changes in the soil texture and structure with depth are observed a. Soil profile b. Soil structure c. Soil texture d. Soil taxonomy Answer – Soil profile 09/19/21 07:01 PM 15 If soil sample is compacted. a. Its mc decreases b. Its porosity remains the same c. Its nutrient content diminishes d. Its bulk density increases Answer – Its bulk density increases 09/19/21 07:01 PM 16 The moisture content of the soil when tension is 1/3 atmosphere. a. Field capacity b. Saturation point c. Wilting point d. None of the above Answer – Field capacity 09/19/21 07:01 PM 17 It is the instrument used in measuring stream velocity. a. anemometer b. hydrograph c. Current meter d. None of the above Answer – Current meter 09/19/21 07:01 PM 18 This refer to the additional height or depth of hydraulic structures a. Flash board b. Free board c. Jump height d. Critical dept Answer – Free board 09/19/21 07:01 PM 19 The rational method of determining runoff is applicable to. a. Small watershed b. Large watershed c. Watershed with good vegetation d. All watershed Answer – Watershed with good vegetation 09/19/21 07:01 PM 20 It is type of erosion where small channels are formed on the surface of the soil a. Splash b. rill c. sheet d. gully Answer – rill erosion 09/19/21 07:01 PM 21 The other term for gravity well. a. Confined well b. Water table well c. Deep well d. Well on perched aquifer Answer – deep well 09/19/21 07:01 PM 22 A storm type occuring at the boundaries of warm moist aur and dry cold air. a. Orographic storm b. Frontal storm c. Convective storm d. None of the above Answer – Frontal storm 09/19/21 07:01 PM 23 Term for solar radiation received at the earth’s surface a. insolation b. illuminance c. radiation d. reflectiion Answer – insolation 09/19/21 07:01 PM 24 The recommended flow velocity on earth canals is. a. 0.30-1.0 m/s b. 1.0-2.0 m/s c. 0.10-0.75 m/s d. None of the above Answer - 0.30-1.0 m/s 09/19/21 07:01 PM 25 On the weather map, lines representing points of equal pressure is called. a. Isohyets b. Contour lines c. Isobars d. None of the above Answer – isobars 09/19/21 07:01 PM 26  It is the measure in difference in the ground level between two places in the field and referred to as percentage. It is the number of meter difference in elevation for each 100 m horizontal distance a. Velocity b. Discharge c. Land slope d. Sides slope Answer – PM 09/19/21 07:01 Land slope 27 Planting different crops simultaneously in the same field at the same cropping season. a. Mixed/multiple cropping b. Relay cropping c. Inter cropping d. Strip cropping Answer – Mixed/multiple cropping 09/19/21 07:01 PM 28  The name for seasonal winds (derived from Arabic mausim, a season). a. trade winds b. Monsoon winds c. Valley winds d. Mountain winds Answer – monsoon winds 09/19/21 07:01 PM 29 The Philippine Agricultural Engineering law of 1998. a. RA 8559 b. RA 8599 c. RA 8995 d. RA 8595 Answer – RA 8559 09/19/21 07:01 PM 30 The Agriculture and Fisheries modernization act of 1998? a. RA 8535 b. RA8435 c. RA8543 d. RA8453 Answer – RA8435 09/19/21 07:01 PM 31 The type of climate prevailing in region 1 and 2. a. Type 1 b. Type 2 c. Type 3 d. Type 4 Answer – type 1 09/19/21 07:01 PM 32 The recommended variation in the lateral between the first and last sprinkle. a. 20% b. 50% c. 70% d. 100% Answer – 20% 09/19/21 07:01 PM 33 A soil ph above 7.7. a. Acidic b. Basic c. Alkali soil d. none Answer – alkali soil 09/19/21 07:01 PM 34 Breeding of cousin to, the cousin. a. Cross breeding b. Line breeding c. Up breeding d. Close breeding Answer – line breeding 09/19/21 07:01 PM 35 If the suction lift is 6 m, the suitable pump is a. Centrifugal b. Axial flow c. submersible d. Mixed flow Answer – centrifugal pump 09/19/21 07:01 PM 36 It is the circulation of water in the earth-atmosphere system. a. Hydrology b. Hydrologic cycle c. Water balance d. Water circulation Answer: Hydrologic cycle 09/19/21 07:01 PM 37  If the rectangular canal have base of 0.65 m, what would be the depth of flow when the hydraulic radius is equal to the area of flow. a. 0.418 m b. 4.18 m c. 0.17 m d. 1.7 m Answer – 0.17 09/19/21 07:01 PM 38 A concrete lined canal is to convey water over a distance of 250 m, from the well to farm, drop in elevation is 0.50 m over canal length and roughness coefficient, n=0.018. Estimate the bottom width of a rectangular canal with a depth of flowing water of 0.25 m, if the hydraulic radius is equal to the depth of flow? a. 0.5 m b. 5m c. 50 m d. None of the above Answer – 0.5 m 09/19/21 07:01 PM 39 What is the velocity of water in the canal in item above. a. 0.062 m/s b. 0.62 m/s c. 6.2 m/s d. 62 m/s Answer – 0.62 m/s 09/19/21 07:01 PM 40 A discharge of 20 L/sec is equivalent to. a. 2 cu.m/hr b. 20000 cu.m/hr c. 0.02 L/min d. 72 cu.m/hr Answer – 72 cu.m/hr 09/19/21 07:01 PM 41  Free flow in artesian wells occur when? a. The piezometer level is higher than the top of the well b. The unconfined aquifer is beneath a confined aquifer c. The permeability is high d. None of the above Answer – The piezometer level is higher than the top of the well 09/19/21 07:01 PM 42  Given an irrigation depth of 30cm and 10 hrs of irrigation time, determine the discharge needed to irrigate a hectare of land. a. 100 cu.m/hr b. 10 cu.m/hr c. 30 cu.m/hr d. 300 cu.m/hr Answer – 300 cu.m/hr 09/19/21 07:01 PM 43  Pipelines built on or near the ground surface to convey water across wide depressions. a. Inverted siphon b. Siphon c. Laterals d. flumes Answer – Inverted siphon 09/19/21 07:01 PM 44 Subsurface system wherein laterals join the submain on the both sides alternately. a. gridiron b. herringbone c. Parallel drain system d. Double main system Answer – herringbone 09/19/21 07:01 PM 45 One liter per second is equal to. a. 16.85 gpm b. 15.5 gpm c. 15.85 gpm d. 17.35 gpm Answer – 15.85 gpm 09/19/21 07:01 PM 46 It is the ratio of the volume of voids to the total volume of the soil a. Void volume b. Bulk density c. Porosity d. Void density Answer – porosity 09/19/21 07:01 PM 47 It is the water retained about individual soil particles by molecular action and can removed only by heating. a. Permanent wilting point b. Hygroscopic water c. Hydroscopic water d. All of the above Answer – Hygroscopic water 09/19/21 07:01 PM 48  It is geologic formation which transmits water at a rate insufficient to be economically developed for pumping a. Aquifer b. Aquiclude c. Aquifuge d. Aquitard Answer – Aquiclude 09/19/21 07:01 PM 49 The artificial application of water to the soil for the purpose of crop production. a. Percolation b. Drainage c. Irrigation d. None of the above Answer – Irrigation 09/19/21 07:01 PM 50 The volume of water flowing each second. a. velocity b. Stream flow c. Cross sectional area d. None of the above Answer – none (Discharge) 09/19/21 07:01 PM 51 An instrument uced to measure the water velocity a. Weir b. Flume c. Speedometer d. Current meter Answer – Current meter 09/19/21 07:01 PM 52 The needed for water to infiltrate into the soil, depending on the depth of water and the soil. a. Infiltration rate b. Infiltration c. Infiltration efficiency d. None of the above Answer – Infiltration rate 09/19/21 07:01 PM 53 A level land surrounded by earth bunds in which water can be ponded unti it infiltrates into the soil a. Basin b. Border c. Bunds d. contour Answer – Basin 09/19/21 07:01 PM 54  Small earth embankment or dam built around each basin to hold water without leakage while it is infiltrate. a. Ponds b. Border c. Bunds d. Basin Answer – bunds 09/19/21 07:01 PM 55  A piece of land divided into strips by small earth bunds usually sloping uniformly away from the farm channel in the direction of water flow to irrigate similar crops and soil. a. Basin b. Contour c. Borders d. Ponds Answer – Borders 09/19/21 07:01 PM 56 A small drain constructed at the end of each boarder to remove excess surface water. a. Main drain b. Tail drain c. Open drain d. None of the above Answer - Tail drain 09/19/21 07:01 PM 57 A hydraulic shock occur when water flowing to pipe undergoes sudden changes in velocity. a. Cavitation b. Hydraulic ram c. Centrifugal force d. Water hammer Answer - Water hammer 09/19/21 07:01 PM 58  The formation of cavities filled with the liquid vapor due to a local pressure drop and their collapse as soon as the vapor bubbles reach regions of high pressure. a. Cavitation b. Hydraulics ram c. Centrifugal force d. Water hammer Answer – Cavitation 09/19/21 07:01 PM 59 A notch of regular form through which the irrigation stream is made to flow and built as either portable or stationary structure. a. Parshall flume b. Weir c. Dam d. Orifice Answer – weir 09/19/21 07:01 PM 60  The most stable and chief component of most soil on volumetric basis a. Chemical element b. Water c. Mineral particles d. Air Answer – mineral particles 09/19/21 07:01 PM 61  The relative proportion of sand, silt and clay determines the: a. Soil texture b. Soil structure c. Soil profile d. Soil taxonomy Answer – soil texture 09/19/21 07:01 PM 62  The arrangement of individual soil particles with respect to each other into pattern is called: a. Soil texture b. Soil structure c. Soil profile d. Soil taxonomy Answer – soil structure 09/19/21 07:01 PM 63  The soil which contain more or less equal amounts of sand, silt and clay. a. Acid soils b. Alkaline soils c. Volcanic soils d. Loam soils Answer – loam soils 09/19/21 07:01 PM 64  The mass per unit volume of the soil particle is: a. Soil density b. Specific gravity c. porosity d. Void ratio Answer – soil density 09/19/21 07:01 PM 65  The ratio of the volume of voids to the total soil volume is called: a. Soil density b. Specific gravity c. porosity d. Void ratio Answer – porosity 09/19/21 07:01 PM 66  The quantity expressing the ratio of the volume of pores to the volume of solids is termed as: a. Soil density b. Specific gravity c. porosity d. Void ratio Answer – void ratio 09/19/21 07:01 PM 67  A vertical section through the soil mass where significant changes in soil texture and structure with depth are observed is: a. Soil texture b. Soil structure c. Soil profile d. Soil taxonomy Answer – soil profile 09/19/21 07:01 PM 68  Water held tightly to the surface of the soil particles by adsorption forces is called: a. Hygroscopic water b. Gravitational water c. Capillary water d. Sea water Answer – hygroscopic water 09/19/21 07:01 PM 69  Water held by forces of surface tension as continuous films around soil particles termed as: a. Hygroscopic water b. Gravitational water c. Capillary water d. Sea water Answer – Capillary water 09/19/21 07:01 PM 70  Water that moves freely and drains out of the soil is: a. Hygroscopic water b. Gravitational water c. Capillary water d. Sea water Answer – Gravitational water 09/19/21 07:01 PM 71  The soil characteristic determining the maximum rate at which water can enter the soil under specific conditions including the presence of excess water is: a. Infiltration b. Capillarity c. Infiltration rate d. Surface tension Answer – Infiltration rate 09/19/21 07:01 PM 72  The movement of water from the surface from the soil. a. Infiltration b. Capillary c. Infiltration rate d. Surface tension Answer – Infiltration 09/19/21 07:01 PM 73  The attraction of water into a hair like opening which defend both on cohesion of the liquid and on the adhesion of the liquid to solid wall. a. Infiltration b. Capillary c. Infiltration rate d. Surface tension Answer – Capillary 09/19/21 07:01 PM 74  The downward movement of water through saturated or nearly saturated soil in response to the force of gravity. a. Seepage b. Permeability c. Interflow d. Percolation Answer – interflow 09/19/21 07:01 PM 75  The infiltration downward and lateral movement of water into soil or substrate from a source of supply such as reservoir or irrigation canal is. a. Seepage b. Permeability c. Interflow d. Percolation Answer – seepage 09/19/21 07:01 PM 76  A device in which the volume of soil planted with vegetation is located in a container to isolate it hydrologically from the surrounding soil. a. Tensiometer b. Lysimeter c. Infiltrometer d. Evaporator Answer – Lysimeter 09/19/21 07:01 PM 77  It refer to the number of days between irrigation during period without rainfall. a. Irrigation efficiency b. Irrigation frequency c. Irrigation period d. Irrigation method Answer – Irrigation period 09/19/21 07:01 PM 78  It is the ratio of the production attained with the operating irrigation system, compared to the total production expected under ideal condition. a. Irrigation efficiency b. Irrigation frequency c. Irrigation period d. Irrigation method Answer – Irrigation efficiency 09/19/21 07:01 PM 79  The phase from germination to panicle initiation in the life cycle of rice plant. a. Metaphase b. Reproductive phase c. Vegetative phase d. Ripening phase Answer – Vegetative phase 09/19/21 07:01 PM 80  The phase from panicle initiation to flowering in the life cycle of rice plant. a. Metaphase b. Reproductive phase c. Vegetative phase d. Ripening phase Answer – Reproductive phase 09/19/21 07:01 PM 81  The phase from flowering to full maturity in the life cycle of the rice plant is. a. Metaphase b. Reproductive phase c. Vegetative phase d. Ripening phase Answer – Ripening phase 09/19/21 07:01 PM 82  The science concerned with study of the atmosphere phase of the hydrologic cycle. a. Hydrology b. Hydrometeorology c. Meteorology d. Aerodynamics Answer – Hydrometeorology 09/19/21 07:01 PM 83  The science with the study of water in all phase of existing is called. a. Hydrology b. Hydrometeorology c. Meteorology d. Aerodynamics Answer – Hydrology 09/19/21 07:01 PM 84  The branch of science with the study of weather condition including their daily movement. a. Hydrology b. Hydrometeorology c. Meteorology d. Aerodynamics Answer- Hydrometeorology 09/19/21 07:01 PM 85  The transmission of heat from one part of the liquid or gas to another by the movement of air or water. a. Convection b. Conduction c. Precipitation d. Evaporation Answer – convection 09/19/21 07:01 PM 86  It refers to all forms for water, solid, liquid coming from the atmosphere. a. Convection b. Conduction c. Precipitation d. Evaporation Answer – Precipitation 09/19/21 07:01 PM 87  The process by which a substance changes from liquid to vapor state. a. Convection b. Precipitation c. Sublimation d. Evaporation Answer – evaporation 09/19/21 07:01 PM 88  The process by which a substance changes from solid to gaseous state without passing liquid state a. Convection b. Precipitation c. Sublimation d. Evaporation Answer –Sublimation 09/19/21 07:01 PM 89  The process by which the precipitation does not reach the ground and evaporated back to the atmosphere a. Interception b. Precipitation c. Transpiration d. Evaporation Answer – Interception 09/19/21 07:01 PM 90  Plants that grows in dry situation and regularly endures and survive drought are called. a. Xarophytes b. Hydrophytes c. Bryophytes d. Spermatophytes Answer – Xarophytes 09/19/21 07:01 PM 91  Plants that thrive well in water or swamps are; a. Xarophytes b. Hydrophytes c. Bryophytes d. Spermatophytes Answer – hydrophytes 09/19/21 07:01 PM 92  A plot of line of equal potential and paths of flow conveniently drawn so that the flow between any two adjacent streamlines is equal to the flow between any other two adjacent streamlines; a. Contour lines b. Flow net c. Isohyets d. Spermatophytes Answer – flow net 09/19/21 07:01 PM 93  A plot of line of equal elevation is a. Contour lines b. Flow net c. Isohyets d. Isobars Answer – Contour lines 09/19/21 07:01 PM 94  A plot of line of equal rainfall is a. Contour line b. Isohyets c. Flow net d. Isobars Answer – Isohyets 09/19/21 07:01 PM 95  Which is not directly related to the small water impounding project a. To control flood and erosion b. For supplementary irrigation c. For power generation and fish culture d. None of the above Answer – None of the above 09/19/21 07:01 PM 96  In the identification of potential dam site, which one is not a part of the guideline a. Availability of narrow gorge for minimum earth work for dam embankment b. Topographic condition providing a wide and deep reservoir upstream of the dam site c. Availability of potential service area for irrigation, power, domestic water supply and flood control d. NOTA Answer – NOTA 09/19/21 07:01 PM 97  SWIM Project in general are those small scale water impounding dam which have structural height of not more than a. 45 m b. 30 m c. 50 m d. 100 m Answer – 30 m 09/19/21 07:01 PM 98  For a dam to called SWIM Project the volume of storage should not exceed a. 50 million cu.m b. 75 million cu.m c. 100 million cu.m d. 125 million cu.m Answer – 50 million cu.m 09/19/21 07:01 PM 99  A land area drained by bodies of water is called a. Watershed b. Drainage area c. Dam site d. Borrow pits Answer – Watershed 09/19/21 07:01 PM 100  One among the ff. is not a major consideration for the SWIM Project selection a. Economically depressed and deprived regions b. A multi project whenever possible c. Areas with recurrent flooding d. High population densities and heavy settlements Answer – High population densities and heavy settlements 09/19/21 07:01 PM 101  In selecting the optimum capacity of the reservoir of a SWIM Project for irrigation purposes, the reliability of the reservoir should be above a. 80-85% b. 30-40% c. 50-60% d. 60-70% Answer – 80-85% 09/19/21 07:01 PM 102  A watershed management strategy where the area is left alone in each natural state and there is minimum or no interference from man is a. Rehabilitation b. Vegetation c. Manipulation d. Protection Answer – Protection 09/19/21 07:01 PM 103  A watershed management strategy which makes used of reforestation and infrastructures for the conservation a. Rehabilitation b. Vegetation c. Manipulation d. Protection Answer – Rehabilitation 09/19/21 07:01 PM 104  The process of determining the difference in elevation between two points a. Profile leveling b. Topographic leveling c. Contouring d. NOTA Answer – NOTA(Differential leveling) 09/19/21 07:01 PM 105  The process of determining the elevation of points at measured distance along selected line a. Profile leveling b. Topographic leveling c. Contouring d. NOTA Answer – Profile leveling 09/19/21 07:01 PM 106  The process by which elevation of space grid points in the field are determined a. Profile leveling b. Topographic leveling c. Contouring d. NOTA Answer – Topographic leveling 09/19/21 07:01 PM 107  When contour line from a closed figure with the highest elevation in the center, the topographic map indicates a. Mound b. Valley c. River d. Depression Answer – Mound 09/19/21 07:01 PM 108  When contour line from a closed figure with the lowest elevation in the center, the topographic map indicates a. Mound b. Valley c. River d. Depression Answer – Depression 09/19/21 07:01 PM 109  The features of topographic map which shows the low area between two adjacent hills a. Mound b. Valley c. River d. Depression Answer – Valley 09/19/21 07:01 PM 110  The features of topographic map which is the line connecting the lowest elevations between two adjacent ridges a. Mound b. Valley c. River d. Depression Answer – River 09/19/21 07:01 PM 111  The features of topographic map which the line connecting the highest elevation between two adjacent valleys a. Ridge b. Valley c. River d. Saddle Answer – Saddle 09/19/21 07:01 PM 112  The no. of years before a storm of given intensity and duration can be expected to recur is a. Rainfall intensity b. Duration period c. Recurrence interval d. Weather Answer – Recurrence interval 09/19/21 07:01 PM 113  The period of time that the rainfall at a particular rate or intensity a. Rainfall intensity b. Duration period c. Recurrence interval d. Weather Answer – Duration period 09/19/21 07:01 PM 114  The rate of rainfall in depth per unit time a. Rainfall intensity b. Duration period c. Recurrence interval d. Weather Answer – Rainfall intensity 09/19/21 07:01 PM 115  The ratio of peak rate of runoff to the rainfall intensity is a. Time of concentration b. Rainfall coefficient c. Runoff coefficient d. Rational method Answer – Runoff coefficient 09/19/21 07:01 PM 116  The time required for water to flow from the most remote point of the watershed to the outlet is a. Time of concentration b. Recurrence interval c. Rational method d. Runoff coefficient Answer - Time of concentration 09/19/21 07:01 PM 117  The areas of land on which crop are irrigated, the size of which can vary from a few hectares to 70 ha or more a. Irrigation units b. Open channel c. Irrigation system d. Watershed Answer – Irrigation units 09/19/21 07:01 PM 118  The system of canal used to distribute water from some sources to an irrigated land a. Irrigation units b. Open channel c. Irrigation system d. Watershed Answer – Irrigation system 09/19/21 07:01 PM 119  The most common method of conveying water for irrigation is a. Irrigation units b. Open channel c. Irrigation system d. Watershed Answer – Open channel 09/19/21 07:01 PM 120  The drainage system or open channel are called a. Canals b. Crops c. Drains d. AOTA Answer - Canals 09/19/21 07:01 PM 121 The speed at which water flows in a channels is a. Discharge b. Velocity c. Stream size d. Unit stream Answer - Velocity 09/19/21 07:01 PM 122  The velocity of water passed in a cross sectional area a. Discharge b. Velocity c. Stream size d. Unit stream Answer – Discharge 09/19/21 07:01 PM 123  The discharge required to irrigate basin, borders and furrow is a. Discharge b. Velocity c. Stream size d. Unit stream Answer – Stream size 09/19/21 07:01 PM 124  The discharge for each meter width of the border irrigated a. Discharge b. Velocity c. Stream size d. Unit stream Answer - Unit stream 09/19/21 07:01 PM 125  A farm channel carries a flow of 20 L/s for a field using furrow irrigation. If each furrow require a flow of 1 L/s, how many furrow can be irrigated at a time? a. 20 b. 200 c. 2000 d. NOTA Answer- 20 09/19/21 07:01 PM 126  The soil reservoir is filled with flooding water on to the soil surface so that it can be absorbed by the soil. Absorbing water in this way is called a. Runoff b. Seepage c. Infiltration d. Precipitation Answer – Infiltration 09/19/21 07:01 PM 127  If too much water is applied in to the soil it is loss as flood this term is a. Runoff b. Seepage c. Infiltration d. Precipitation Answer – Runoff 09/19/21 07:01 PM 128  An agricultural engineer uses the quarter time rules in irrigating the field. If the contact time required to fill the soil reservoir is 1 day, how long will the water reach the far end of the field a. 240 min b. 260 min c. 360 min d. 320 min Answer 09/19/21 07:01 PM – 360 min 129  An average depth of 100mm of water is needed to irrigate 5 ha of land in 20 hrs, what stream size is needed? a. 6.95 L/s b. 69.5 L/s c. 695 L/s d. 6950 L/s Answer – 69.5 L/s, 0.1*50000sq.m*1000L/72000s 09/19/21 07:01 PM 130  A uniform distribution of water is obtained in border irrigation by stopping the flow at the right time and using a a. Large stream size b. Small stream size c. Variable stream size d. Rapid stream size Answer – Small stream size 09/19/21 07:01 PM 131  75mm of water is needed to irrigate the field. In order to irrigate adequately over the whole area, an average depth of 100mm must be applied, how much water is lost a. 2.5mm b. 25mm c. 75mm d. 7.5mm Answer – 25mm, 100mm-75mm 09/19/21 07:01 PM 132  Washing salt from the soil by using excess water to dissolve and carry each beyond the root zone a. Leaching b. Bleaching c. Blanching d. None of the above Answer – Leaching 09/19/21 07:01 PM 133  The simplest and most widely used of all surface irrigation method, adapted to suit many crops and farming practices are a. border b. basin c. furrow d. sprinkler Answer – basin 09/19/21 07:01 PM 134  When the land is divided into strips by small bunds to irrigate similar crops and soils, sloping uniformly away from the farm channel, the irrigation method is a. border b. basin c. furrow d. sprinkler Answer – border 09/19/21 07:01 PM 135  This is the most widely used for irrigating row crops where water is confined to small channel between the crop row a. border b. basin c. furrow d. sprinkler Answer – furrow 09/19/21 07:01 PM 136  A level area surrounded by earth bunds in which water can be ponded until each infiltrate into the soil a. border b. basin c. furrow d. sprinkler Answer – basin 09/19/21 07:01 PM 137  They are recognized by there long narrow shape varying in size from 100-300m long and 3-30m wide and none level ff the general slope of land a. border b. basin c. furrow d. sprinkler Answer – border 09/19/21 07:01 PM 138  A small channel between the crop rows large enough to carry water a. border b. basin c. furrow d. sprinkler Answer – furrow 09/19/21 07:01 PM 139 Conservation of energy is often applied in practice as a. Pascal Law b. Torrecelli Theorem c. Darcy Equation d. Bernoullis Equation Answer – Bernoullis Equation 09/19/21 07:01 PM 140 The term head is often used to mean a a. Flow b. Momentum c. Velocity d. Energy e. Discharge Answer - Discharge 09/19/21 07:01 PM 141  The energy is commonly associated with fluid flow are potential, kinetic and a. Flow b. Electrical c. Mechanical d. None of the above Answer – Flow 09/19/21 07:01 PM 142  Flow energy is sometimes expressed as a. Velocity head b. Pressure head c. Elevation head d. NOTA Answer – Velocity head 09/19/21 07:01 PM 143  The ratio of the density of material to the density of water at 4 degree Celcius a. Specific gravity/Related density b. Specific density c. Unit weight d. Unit volume Answer – Specific gravity/Related density 09/19/21 07:01 PM 144  The shear stress of the fluid times the slope of the velocity vectors is a constant called a. Dynamic viscosity b. Unit weight c. Relative density d. Compressive stress Answer – Dynamic viscosity 09/19/21 07:01 PM 145  A measured of the variability of viscosity has been established with a numerical designation is called a. Dynamic viscosity b. Kinematic viscosity c. Absolute viscosity d. Viscosity index Answer – Viscosity index 09/19/21 07:01 PM 146 The direct result of the molecular attraction between molecules is a. Surface tension b. Collision c. Tension d. Repulsion Answer – Surface tension 09/19/21 07:01 PM 147  The attraction between like molecules is called a. Adhesion b. Cohesion c. Tension d. Repulsion Answer – Cohesion 09/19/21 07:01 PM 148  Attraction of unlike molecules is a. Adhesion b. Cohesion c. Tension d. Repulsion Answer – Adhesion 09/19/21 07:01 PM 149  A device for measuring atmospheric pressure a. Barometer b. Blower c. Accumulator d. Hydrometer Answer – Barometer 09/19/21 07:01 PM 150  A container for storing a pressurized fluid a. Barometer b. Blower c. Accumulator d. Hydrometer Answer – Accumulator 09/19/21 07:01 PM 151  A device to move a gas, generally at a higher rate and lower pressure than a fan does a. Barometer b. Blower c. Accumulator d. Hydrometer Answer – Blower 09/19/21 07:01 PM 152  A property associated with a surface tension of a liquid and manifested in the rise and fall of a liquid in small diameter tube a. Capillary b. Cavitation c. Condensation d. Conduction Answer: Capillary 09/19/21 07:01 PM 153  A process of a phase change between vapor to liquid involving removal of heat a. Capillary b. Cavitation c. Condensation d. Conduction Answer – Condensation 09/19/21 07:01 PM 154  The process of heat moving from atom by an exchange of kinetic energy a. Capillary b. Cavitation c. Condensation d. Conduction Answer – Conduction 09/19/21 07:01 PM 155 The formation and collapse of vapor bubbles at low pressure a. Capillary b. Cavitation c. Condensation d. Conduction Answer – Cavitation 09/19/21 07:01 PM 156  A gas _________ a. Will not fill a container b. Can be compressed c. Has its molecule closer together than a liquid d. It can occupy space Answer – Can be compressed 09/19/21 07:01 PM 157  The volume per unit mass a. Specific weight b. Specific gravity c. Specific volume d. Specific density Answer – Specific volume 09/19/21 07:01 PM 158  The ratio of the specific weight to the density a. Acceleration due to gravity b. Mass c. Weight d. Specific gravity Answer – Acceleration due to gravity 09/19/21 07:01 PM 159  Absolute or dynamic viscosity is a relationship between a. Shear stress and velocity gradient b. Velocity and force c. Force and area d. Velocity and area Answer – Shear stress and velocity gradient 09/19/21 07:01 PM 160  The appropriate unit for dynamic viscosity a. Joule b. Newton c. Pascal d. NOTA Answer – NOTA, poise 09/19/21 07:01 PM 161 The pressure at which a liquid boils is a. Gage pressure b. Absolute pressure c. Atmospheric pressure d. Vapor pressure Answer – Vapor pressure 09/19/21 07:01 PM 162 Hydrometer is used to measure a. Humidity b. Viscosity c. Specific gravity d. NOTA Answer – Specific gravity of liquid 09/19/21 07:01 PM 163  The Baume, API, and Twaddell are all use for a. Absolute viscosity b. Specific gravity c. Kinematic viscosity d. NOTA Answer – Specific gravity 09/19/21 07:01 PM 164  The basic form of energy loss in flow equation stating that the energy loss is directly proportional to the some friction factor, the length of the system and the kinetic energy level and inversely proportional to the diameter of the conductor a. Darcy equation b. Manning equation c. Bernoullis equation d. Hagen – Poiseuille equation Answer – Darcy equation 09/19/21 07:01 PM 165  A simplification of Darcy equation for energy loss, applicable solely to the laminar flow is a. Darcy equation b. Manning equation c. Bernoullis equation d. Hagen – Poiseuille equation Answer – Hagen – Poiseuille equation 09/19/21 07:01 PM 166  A device for measuring temperature that is made from oxide, indicate absolute temperature and can be formed of the variety of shape a. Thermistor b. Thermocouple c. Thermometer d. NOTA Answer 09/19/21 07:01 PM – Thermistor 167  A device for connecting three flows paths a. Tee b. Thermistor c. Thermocouple d. thermometer Answer – tee 09/19/21 07:01 PM 168  A device for measuring temperature based on the electrical difference of two materials. a. Tee b. Thermistor c. Thermocouple d. thermometer Answer – Thermocouple 09/19/21 07:01 PM 169  A device used in measuring temperature based on some physical properties of materials a. Tee b. Thermistor c. Thermocouple d. Thermometer Answer – Thermometer 09/19/21 07:01 PM 170  A simple vertical tube used to measure pressure on the basis of the height of the column of liquid a. Piezometer b. Weir c. Venturi d. Sluice gate Answer – Piezometer 09/19/21 07:01 PM 171  A panel generally rectangular, located near the lowest level of a tank or reservoir that, when lifted permits flows a. Piezometer b. Weir c. Venturi d. Sluice gate Answer – Sluice gate 09/19/21 07:01 PM 172  A highly efficient variable head flow meter whose restriction contracts and expand very slowly a. Piezometer b. Weir c. Venturi d. Sluice gate Answer - Venturi 09/19/21 07:01 PM 173  A restriction placed in an open channel for the purpose of flow measurement a. Piezometer b. Weir c. Venturi d. Sluice gate Answer - Weir 09/19/21 07:01 PM 174  Suppose a farm channel 4km long with a cross sectional area of 0.75 sq.m is to be filled with water before irrigation can begin. How long will this take when the discharge is 30Lps? a. 27 hours b. 17 hours c. 10 hours d. 5 hours Answer – 27 hours, Qt=Ad 09/19/21 07:01 PM 175  These are breaks which occur in channel bank causing water to spilled from the channel in an uncontrolled manner a. Erosion b. Breaches c. Cavitation d. Drainage Answer – Breaches 09/19/21 07:01 PM 176  Light steady rain in fine drops about 0.5 mm and intensity less than 1 mm/h a. Drizzle b. Virga c. Glaze d. Dew Answer – drizzle 09/19/21 07:01 PM 177  An 8 mm rainfall was measured by a USWB standard rain gauge, 8 inches in diameter. Determines the depth in the inner cylinder whose area is 1/10 of the catch area a. 0.8 cm b. 259 mm c. 80 mm d. 80 cm Answer – 80 mm 09/19/21 07:01 PM 178  When the water level in the pipe drops below the upper edge of the pipe and the conduit controls, the flow becomes a. Weir flow b. Orifice flow c. Open channel flow d. Pipe flow Answer – Open channel flow 09/19/21 07:01 PM 179  The rate of vertical water movement through the soil at saturated condition is. a. Infiltration rate b. Depletion rate c. Percolation rate d. Soil permeability Answer – Infiltration rate 09/19/21 07:01 PM 180  A hydraulic jump is classic example of the type of flow: a. Unsteady flow b. Uniform flow c. Rapidly varied flow d. Critical flow Answer – Rapidly varied flow 09/19/21 07:01 PM 181  The soil property which described the ability of the soil to transmit water a. Hydraulic conductivity b. Matric potential c. Percolation rate d. Infiltration rate\ Answer – Hydraulic conductivity 09/19/21 07:01 PM 182  What is the effect of the presence of extensive vegetation in a watershed: a. Reduce peak runoff rate b. Increases infiltration capacity c. Both a and b d. NOTA Answer – Both a and b 09/19/21 07:01 PM 183  Type of rainfall cause by the upward lifting of the air mass due a mountain: a. Convective b. Cyclonic c. Orographic d. Frontal Answer – Orographic 09/19/21 07:01 PM 184  What do called the mountain side, with reference to the wind direction in which the air masses passing through it is clod and dry: a. Wayward b. Leeward c. Trade wind d. Windward Answer – leeward 09/19/21 07:01 PM 185  It is the natural and synthetic hydrograph for one unit of direct runoff from the catchments in a specific unit of time: a. Basic hydrograph b. Unit hydrograph c. Design hydrograph d. Runoff hydrograph Answer – Unit hydrograph 09/19/21 07:01 PM 186  Graphical representation of instantaneous runoff rate against time : a. Hydrograph b. Log-probability graph c. Monograph d. Hyetograph Answer – Hydrograph 09/19/21 07:01 PM 187  The capacity of rainfall to effect the detachment and transport of soil particles: a. Erodability b. Effectivity c. Erosivity d. Conductivity Answer – Erosivity 09/19/21 07:01 PM 188  Removal of soil by water from small but well defined channels when there is concentration of over land flow a. Stream channel erosion b. Rill erosion c. Gully erosion d. Sheet erosion Answer – Stream channel erosion 09/19/21 07:01 PM 189  Structured devise design to hold a pool of water to cushion the impact and retard the flow of falling water as from an overflow weir, chute or drop a. sill b. apron c. Stilling basin d. pond Answer – Stilling basin 09/19/21 07:01 PM 190  Uniform removal of soil in thin layers from sloping land resulting from over land flow a. Stream channel erosion b. Rill erosion c. Gully erosion d. Sheet erosion Answer – sheet erosion 09/19/21 07:01 PM 191  It is the time required for water to flow from the most remote point of the water shed to the outlet a. Time to peak b. Recession time c. Lag time d. Perennial time Answer – time to peak 09/19/21 07:01 PM 192  When is the best/recommended time to sample sediment load in the stream a. Peak flow b. Intermittent flow c. Base flow d. Perennial flow Answer – peak flow 09/19/21 07:01 PM 193  The equation used in current meters is V= a+bN. What is b signifies? a. Starting velocity b. Bed slope c. Y-intercept d. Number of revolution Answer – starting velocity 09/19/21 07:01 PM 194  In discharged measurement, the reading in the staff gage are useless without this: a. Synthetic hydrograph b. Rating curve c. Unit hydrograph d. Matching curve Answer – rating curve 09/19/21 07:01 PM 195  In the Soil Conservation Service method (curve number method), if the curve number is 100, this indicates that a. Rainfall is equal to runoff b. Runoff is zero c. Rainfall is less than runoff d. Rainfall is highly erosive Answer – rainfall is equal to runoff 09/19/21 07:01 PM 196  Determine the 10 year period peak runoff for a 80ha watershed having a runoff coefficient of 0.4, maximum length of water is 610m and the fall along this path is 6m. The rainfall intensity for that return period is 101.25mm/hr having a duration equal to the time of concentration. a. 9.0 b. 1.5 c. 16.5 d. 16.3 Answer – 9 09/19/21 07:01 PM 197  A super critical flow is a flow condition where: a. Fr =1 ( critical) b. Fr >1 c. Fr4000 (turbulent) Answer – Fr>1 09/19/21 07:01 PM 198  The rate of decrease of temperature with the increase in elevation is called. a. updraft b. Lapse rate c. Convention rate d. Deflection rate Answer – lapse rate 09/19/21 07:01 PM 199  The approximate threshold for the soil loss in the Philippines is around 12metric ton per hectare per year. Assuming a soil bulk density of 1.2 metric ton / cu. m, What is the soil erosion in mm/ yr. a. 0.1 mm / yr b. 1.0 mm / yr c. 10 mm / yr d. 100 mm / yr Answer – 1.0 mm / yr 09/19/21 07:01 PM 200  A type of cropping system where in different crops are planted in an area one after the other each season. a. Strip cropping b. Cropping pattern c. Mixing cropping d. Relay cropping Answer- relay cropping 09/19/21 07:01 PM 201  What is the erosion rate in 10 ha farm with an average slope of 3%. Given: slope length factor =1.0 soil erodibility= 0.25 conservation practice factor =1.0 rainfall factor =178 a. 267 mm / yr b. 26.7 mm / yr c. 2.67 mm /yr d. 80.1mm /yr Answer – 26.7 mm / yr 09/19/21 07:01 PM 202  Using the float method in determining the velocity of water in a channel, the float velocity in relation the average water velocity is: a. Equal to the average water velocity b. Less than the average water velocity c. Greater than the average water velocity d. No relation at all Answer – greater than the average water velocity 09/19/21 07:01 PM 203  The USLE is a method of computing soil erosion. What type of soil erosion does it estimate? a. Sheet erosion only b. Sheet and rill erosion only c. Sheet, rill and gully erosion d. All types of erosion Answer – sheet and rill erosion only 09/19/21 07:01 PM 204  A flood flow of 560 cu.m per second was determined to have a 20% probability of occurrence. What is its return period? a. 2 years b. 5 years c. 20 years d. 50 years Answer –5 years 09/19/21 07:01 PM 205  For a watershed of 360 ha, the peak runoff rate for a 0.5 cm/hr rain intensity (at the time of concentration) was observed as 2.5 cu.m/s. What is the runoff coefficient? a. 0.5 b. 0.005 c. 5.0 d. 0.05 Answer – 0.05 09/19/21 07:01 PM 206  A type of terrace usually used for 9- 24% slope characterized by breaking the slope at certain intervals by a ridge and a flat portion to trap runoff. a. Bench terrace b. Broad based terrace c. Zingg terrace d. Manning’s terrace Answer – Zingg terrace 09/19/21 07:01 PM 207  A type of terrace usually used for 25-30% slope characterized by construction of series of platforms along the contours cut into the hill slope in a step like formation. a. Bench terrace b. Broad based terrace c. Zingg terrace d. Manning’s terrace Answer – Bench terrace 09/19/21 07:01 PM 208  A storm occurred in two similar watersheds, Glads and Karl, both 700 has. in area. Glads watershed is long and slender while Karl watershed is short but wide. Which watershed will experience the earliest and highest peak flow assuming that the rainfall over the watershed is evenly distributed? a. Karl b. The same c. Glads d. Neither Karl nor Glads Answer – Karl 09/19/21 07:01 PM 209  Type of flow wherein the discharge or flow in a prismatic channel is constant with respect to time a. Laminar flow b. Steady flow c. Uniform flow d. Critical flow Answer – steady flow 09/19/21 07:01 PM 210  Type of sediment load along the stream characterized as sediments that are sometimes stationary or sometimes carried by the water along the stream a. Saltating load b. Temporary load c. Bed load d. Suspended load Answer – Saltating load 09/19/21 07:01 PM 211  In frequency analysis, most hydrologic processes follow this process. This process governed by chance and time dependent. What type of process is this? a. Deterministic Process b. Stochastic Process c. Probabilistic Process d. Hydrolistic process Answer – Stochastic Process 09/19/21 07:01 PM 212  The theoretical flow velocity in an orifice is 4 m/s, what is the height of water flowing the center of the orifice? a. 20.4 cm b. 81.6 cm c. 361.2cm d. 90.3 cm Answer – 81.6 cm 09/19/21 07:01 PM 213  Determine the crest length of a structure for a chute spillway for a design flow of 1.4 cms and a maximum water level at the inlet is 0.5 m, the coefficient of discharge is 1.66. a. 0.54 m b. 2.38 m c. 4.38 m d. 3.28 m Answer – 2.38 m 09/19/21 07:01 PM 214  A rectangular water tank, 2 m high is filled with water. Due to rust, a circular hole was made to the lowest portion of one side of the tank. Considering that the tank is maintained full, what is the velocity of water right after its take-off from the hole? a. 6.26 m/s b. 4.43 m/s c. 39.22 m/s d. 19.63 m/s Answer – 6.26 m/s 09/19/21 07:01 PM 215  What is the water depth in a 24 inch diameter culvert which flows at 500 gpm and 2 ft/s velocity? a. 24 in b. 1.4 in c. 12 in d. 7.2 in Answer – 7.2 in 09/19/21 07:01 PM 216  A horizontal fully flowing 4 in pipe is discharging water. The x and y-coordinate of the water trajectory is measured from the end of the pipe are 1.5 m and 0.8 m, respectively. Assuming that the coefficient of discharge is 1.0, what is the discharge of the pipe? a. 10 lps b. 20 lps c. 30 lps d. 40 lps Answer – 30 lps 09/19/21 07:01 PM 217  What should be the minimum weir height for measuring a flow of 1000 gpm with a 90 degree V-notch weir, if the flow is now moving at 5 ft/sec in a 2 ft wide rectangular channel? a. 1.5 ft b. 1.3 ft c. 1.4 ft d. 1.2 ft Answer – 1.2 ft 09/19/21 07:01 PM 218  A 10 inch diameter pipe is flowing 1/3 full, what is the velocity of the water if the volume of flow is 135 gpm? a. 7.2 m/s b. 2.0 ft/sec c. 10.6 ft/sec d. 0.01 m/s Answer – 2.0 ft/sec 09/19/21 07:01 PM 219  On a 20% hill slope, it is proposed to construct bench terraces with 1.1 batter slope, if the vertical interval is 2 m, what is the width of the terrace? a. 10 m b. 20 m c. 8m d. 16 m Answer – 8 m 09/19/21 07:01 PM 220  The sheet of water which overflows a weir. a. Nappe b. Weir pond c. Overflow d. Discharge Answer – Nappe 09/19/21 07:01 PM 221  The rate of infiltration from a furrow into the soil is a. Intake rate b. Infiltration rate c. Permeability d. NOTA Answer – Intake rate 09/19/21 07:01 PM 222  The time rate at which water will percolate into the soil is a. Intake rate b. Infiltration rate c. Permeability d. NOTA Answer – Infiltration rate 09/19/21 07:01 PM 223  The velocity of flow into the soil caused by a unit hydraulic gradient in which the driving force is 1 kg/kg of water. a. Intake rate b. Infiltration rate c. Permeability d. NOTA Answer – Permeability 09/19/21 07:01 PM 224  The fraction of the irrigation water that must be leached through the root zone to control soil salinity at specific level a. Percolated water b. Available moisture c. Field capacity d. Leaching requirement Answer – Leaching requirement 09/19/21 07:01 PM 225  The sum of evapotranspiration and percolation losses a. Crop water requirement b. Farm water requirement c. Diversion requirement d. Irrigation water requirement Answer - Crop water requirement 09/19/21 07:01 PM 226  Farm turnout requirements plus conveyance losses in the main canal and lateral up to the farm turnout. a. Crop water requirement b. Farm water requirement c. Diversion requirement d. Irrigation water requirement Answer – Diversion requirement 09/19/21 07:01 PM 227  The quantity of water exclusive of precipitation required to maintain desired soil moisture and salinity level during the crop season a. Crop water requirement b. Farm water requirement c. Diversion requirement d. Irrigation water requirement Answer - Irrigation water requirement 09/19/21 07:01 PM 228 The sum of irrigation requirement and farm ditch losses a. Crop water requirement b. Farm water requirement c. Diversion requirement d. Irrigation water requirement Answer - Farm water requirement 09/19/21 07:01 PM 229  It is the ratio of the dry weight of soil particles to the weight of an equal volume of water a. Particle density b. Bulk density c. Real specific density d. Apparent specific gravity Answer – Real specific density 09/19/21 07:01 PM 230  The moisture content of the soil when the gravitational water has been removed. a. Available water b. Field capacity c. Permanent wilting point d. Readily available moisture Answer - Field capacity 09/19/21 07:01 PM 231  1250 cu.m of water was delivered to a 10 ha farm for the month of June in which the consumptive use is estimated at 8 mm/day. The effective rainfall for the period was 150 mm. What is the irrigation frequency?. a. 32% b. 87% c. 72% d. 52% Answer - 72% 09/19/21 07:01 PM 232  These are pipelines built on or near the ground surface to convey water across wide depressions a. Inverted siphons b. Siphons c. Laterals d. Flumes Answer- Inverted siphons 09/19/21 07:01 PM 233  Evapotranspiration in an 8 ha farm is 7 mm/day and percolation losses is 2 mm/day. What is the design discharge of a canal to be able to deliver a 5 day requirement of the farm in 24 hours, if irrigation efficiency is 75%? a. 150 cu.m/hr b. 200 cu.m/hr c. 175 cu.m/hr d. 140 cu.m/hr Answer – 200 cu.m/hr 09/19/21 07:01 PM 234  How much water should be applied to a 6 ha farm where the rooting depth is 80 cm if it is in its permanent wilting point? Volumetric moisture contents are 0.15 and 0.32 for permanent wilting point and field capacity, respectively a. 7200 cu.m b. 6120 cu.m c. 15360 cu.m d. 8160 cu.m Answer – 8160 cu.m 09/19/21 07:01 PM 235  What is the depth of water in a trapezoidal channel with a sideslope of 2 and carrying a 2.5 cu.m/s water flow? The channel bottom width is 1.5 m and the flowing water has a velocity of 0.8 m/s. a. 1.00 m b. 0.93 m c. 1.20 m d. 0.82 m Answer – 0.93 m 09/19/21 07:01 PM 236  How many sprinklers with spacing of 7m x 7m are needed to irrigate a rectangular piece of land 125m x 190m if the laterals are set parallels to the longer side of the field a. 503 b. 504 c. 486 d. 485 Answer – 486 09/19/21 07:01 PM 237  If the impeller speed of a centrifugal pump is increased from 1800 rpm to 2340 rpm, the resulting power will be how many times the original? a. 1690 b. 2197 c. 1091 d. 1140 Answer – 2197 09/19/21 07:01 PM 238  Darcy's law states that the flow of water through a porous medium is a. Proportional to the medium hydraulic conductivity b. Inversely proportional to the length of flow path c. Both a and b d. Neither a nor b Answer – Both a and b 09/19/21 07:02 PM 239  One liter per second is equal to a. 16.85 gpm b. 15.5 gpm c. 15.85 gpm d. 17.35 gpm Answer – 15.85 gpm 09/19/21 07:02 PM 240  A soil sample was obtained using s cylindrical soil sampler with a 4 inches diameter and 10 inches height. After oven drying the sample weight 2470 g, what is the soil bulk density? a. 12 g/cc b. 11 g/cc c. 1200 kg/cu.m d. 1.3 kg/cu.m Answer – 1200 kg/cu.m 09/19/21 07:02 PM 241  Find the cross sectional area of the stream. Consider the irrigated ditch with the ff dimensions: bottom width- 50 cm total depth- 60 cm side slope- 1:1 water depth – 40 cm channel bed slope- 1m/1km n – 0.02 a. 3.6 sq.m b. 0.36 sq.m c. 36 sq.m d. NOTA Answer – 0.36 sq.m 09/19/21 07:02 PM 242  Compute the wetted perimeter of the above problem: a. 0.163 m b. 1.63 m c. 16.3 m d. NOTA Answer – 1.63 m 09/19/21 07:02 PM 243  The hydraulic radius is: a. 0.22 m b. 2.2 m c. 22 m d. NOTA Answer – 0.22 m 09/19/21 07:02 PM 244  The velocity of the flow is: a. 0.58 m/s b. 1.05 m/s c. 0.25 m/s d. 0.45 m/s Answer – 0.58 m/s 09/19/21 07:02 PM 245  What is the discharge in li/sec? a. 300 li/sec b. 178 li/sec c. 209 li/sec d. 200 li/sec Answer – 209 li/sec 09/19/21 07:02 PM 246  An irrigation engineer is to irrigate a crop planted in furrows of 100m x 100m area. The inflow rate is 0.5 li/sec/100m. If the furrow spacing is 50 cm and the application depth is 100 mm, determine the time in hours to irrigate the whole area. a. 55.68 hrs b. 555.6 hrs c. 450.17 hrs d. 245.56 hrs Answer – 555.6 hrs, Q=Ad/t 09/19/21 07:02 PM 247 From the above problem, determine the time in hours to irrigate each furrow a. 2.78 hrs/furrow b. 2.45 hrs/furrow c. 147 min/furrow d. Two of the above Answer - 2.78 hrs/furrow 09/19/21 07:02 PM 248  75% of the available moisture a. Moisture Allowed Deficit b. Readily Available Moisture c. Available Moisture d. NOTA Answer – Readily Available Moisture 09/19/21 07:02 PM 249  It is the difference between field capacity and wilting point a. Moisture Allowed Deficit b. Readily Available Moisture c. Available Moisture d. NOTA Answer – Available Moisture 09/19/21 07:02 PM 250  The product of Available Moisture to the Percent Moisture Depletion a. Moisture Allowed Deficit b. Readily Available Moisture c. Available Moisture d. NOTA Answer – Moisture Allowed Deficit 09/19/21 07:02 PM 251  The amount of moisture content that is left from the soil 2-3 days after heavy application of rain or irrigation water a. Field Capacity b. Wilting point c. Excess water d. Available water Answer – field capacity 09/19/21 07:02 PM 252  Soil less agriculture. a. Hydrophonic b. Hygrophonic c. Barren d. NOTA Answer – Hydrophonic 09/19/21 07:02 PM 253  Find the irrigation interval. Given the ff. WHC- 1.5 MAD- 50% allowed depletion-0.75 cm ET/Ea-2.22 mm/day a. 3 days b. 2 days c. 4 days d. All of the above Answer – 3 days, F=allowed depletion/W.R W.R = ET/Ea 09/19/21 07:02 PM 254  Characterize by irregular path of particle movements which keep of crossing and re-crossing a. Turbulent flow b. Laminar flow c. Steady flow d. Uniform flow Answer – Turbulent flow 09/19/21 07:02 PM 255  A type of flow where the discharge passing a given cross section of a stream is constant a. with time Turbulent flow. b. Laminar flow c. Steady flow d. Uniform flow Answer – Uniform flow 09/19/21 07:02 PM 256  Average lapse rate in troposphere a. 6.5 C/km b. 7.5 C/km c. 8.5 C/km d. NOTA Answer – 6.5 C/km 09/19/21 07:02 PM 257  Characterized by a vertically isothermal structure in the lower portion followed by increasing temperature in the upper portion a. Troposphere b. Stratosphere c. Mesosphere d. Thermosphere Answer – Stratosphere 09/19/21 07:02 PM 258  Characterized by a nearly uniform decrease in temperature with height, most weather changes are limited here a. Troposphere b. Stratosphere c. Mesosphere d. Thermosphere Answer – Troposphere 09/19/21 07:02 PM 259  Lower part of the thermosphere, ionized layer which the long distance radio communication is possible. a. Ionosphere b. Exosphere c. Protosphere d. NOTA Answer: Ionosphere 09/19/21 07:02 PM 260  Most of the thermosphere. a. Ionosphere b. Exosphere c. Protosphere d. NOTA Answer – Exosphere 09/19/21 07:02 PM 261  Upper part of the thermosphere, where earth magnetic field is more important than gravitational field in controlling the behaviors of proton a. Ionosphere b. Exosphere c. Protosphere d. NOTA Answer – Protosphere 09/19/21 07:02 PM 262 Refer to the short-period variations in the atmosphere a. Weather b. Climate c. Horizontal visibility d. NOTA Answer – Weather 09/19/21 07:02 PM 263  Refers to the long period manifested by weather a. Weather b. Climate c. Horizontal visibility d. NOTA Answer – Climate 09/19/21 07:02 PM 264  At what time where the sun is farthest distance from the earth a. Aphelion b. Perihelion c. The permeability is high d. None of the above Answer – aphelion 09/19/21 07:02 PM 265  The most stable and chief component of most soil on a volumetric basis. a. Mineral particles b. Chemical elements c. Water d. Air Answer – mineral Particles 09/19/21 07:02 PM 266