Irrigation Engineering MCQ Questions and Answers in Civil Engineering

Question. Crop ratio is the ratio of area irrigated ?
a) in Rabi season to Kharif season
b) in Kharif season to Rabi season
c) under perennial crop to total crop
d) under perennial crop to non-perennial crop

Answer : B

Question. A river meandering through an alluvial plain has a series of consecutive curves of order connected with short straight sketches, is called ?
a) crossing
b) meandering belt
c) meandering length
d) none

Answer : A

Question. For low navigation the type gate used ?
a) rolling gate
b) bear trap gate
c) vertical lift gate
d) drum gate

Answer : B

Question. Rivers on alluvial plains may be ?
a) meandering type
b) aggrading type
c) degrading type
d) all of these

Answer : D

Question. The height of dowel above the road level should not be more than ?
a) 10 cm
b) 20 cm
c) 30 cm
d) 40 cm

Answer : C

Question.The method used for training of rivers is ?
a) guide bank
b) dyke or levee
c) groyne
d) all of these

Answer : D

Question. The earth's water circulatory system, is known as ?
a) water cycle
b) hydrologic cycle
c) precipitation cycle
d) all of these

Answer : B

Question. Cyclonic precipitation results from ?
a) lifting of air masses converging into low pressure area
b) natural rising of warmer, lighter air in colder and denser surroundings
c) lifting of warm moisture-laden air masses due to topographic barriers
d) all of the above

Answer : A

Question. The berms when fully formed ?
a) reduce the absorption losses and prevents leaks
b) protect the bank from erosion because of wave action
c) provide a scope for future widening the channel
d) all of the above

Answer : D

Question. A graph showing variations of discharge with time, at a particular point of a stream is know ?
a) mass inflow curve
b) logistic curve
c) hydrograph
d) none of these

Answer : C

Question. The fall which can be used as a meter fall, is ?
a) vertical drop fall
b) flumed glacis fall
c) unflumed glacis fall
d) none of these

Answer : A

Question. A device which ensures a constant discharge of water passing from one channel to another irrespective of water level in each within certain specified limits, is called ?
a) flume
b) module
c) meter
d) none of these

Answer : B

Question. The river training works are adopted on a river ?
a) to pass high flood discharge safely and quickly through the breach
b) to direct and guide the river flow
c) to reduce bank erosion to a minimum
d) all of the above

Answer : D

Question. The weed growth in a canal leads to ?
a) decrease in silting
b) decrease in discharge
c) increase in discharge
d) increase in velocity of flow

Answer : B

Question. The knowledge of hydrology is necessary in civil engineering for ?
a) designing and construction of irrigation structures
b) designing and construction of bridges and culverts
c) flood control works
d) all of these

Answer : D

Question. Liquid precipitation consists of ?
a) snow
b) hail
c) sleet
d) rainfall

Answer : D

Question. According to Lacey ?
a) the silt is kept in suspension due to the force of vertical eddies
b) the eddies are generated from bed and sides, both normal to the surface of generation
c) the vertical component of eddies generated from sides will also support the silt
d) none of the above

Answer : D

Question. The optimum depth of kor watering for wheat in the plains of north india is ?
a) 13.5 cm
b) 16.5 cm
c) 19 cm
d) 21 cm

Answer : A

Question. A spoil bank is formed when the ?
a) canal has steep bed slope
b) canal section is too large
c) volume of excavation is in excess of the embankment filling
d) canal alignment is meandrous

Answer : C

Question. The cylinder or well fall is quite suitable and economical for ?
a) high discharges and high drops
b) high discharges and low drops
c) low discharges and low drops
d) low discharges and high drops

Answer : D

Question. The ratio between the area of a crop irrigated and the quantity of water required during entire period of the growth, is known as ?
a) crop period
b) delta
c) duty
d) base period

Answer : C

Question. The precipitation caused by lifting of warm moisture laden air masses due to topographic carriers, is called ?
a) cyclonic precipitation
b) convective precipitation
c) none of these
d) orographic precipitation

Answer : D

Question. An outlet in which the discharge depends upon the difference in level between the water in distributing channel and the water course, is known as ?
a) semi-module outlet
b) rigid module
c) non-modular outlet
d) modular outlet

Answer : C

Question. The basic factor which controls the process of meandering is ?
a) bed and side resistance
b) discharge
c) valley slope
d) all of these

Answer : D

Question. The crest of the under-sluices should be lower than the crest of the head regulator (if silt excluder is provided) by at least ?
a) 1.8 to 2 m
b) 4 to 5 m
c) 2 to 2.5 m
d) 1 to 1.2 m

Answer : A

Question. Lacey assumed that silt is kept in suspension because of the normal components of eddies ?
a) bed only generated from the
b) side only
c) whole perimeter
d) none of these

Answer : C

Question. A hydraulic jump is formed when ?
a) the two flows of sub-critical velocity meet each other
b) the two flows of super-critical velocity meet each other
c) a sub-critical flow strikes against a super-critical flow
d) a super-critical flow strikes against a sub-critical flow

Answer : C

Question. Lacey gave a relation between ?
a) area and velocity
b) velocity and hydraulic mean depth
c) both (a) and (b)
d) none of these

Answer : C

Question. The measure adopted to reclaim the water-logged area is ?
a) lowering the full supply level
b) installation of lift irrigation schemes
c) lining of canals
d) all of these

Answer : B

Question. The graphical representation of average rainfall and rainfall excess (i.e. rainfall mi infiltration) rates over specified areas during successive unit time intervals during a storm is know ?
a) hyetograph
b) hydrograph
c) unit hydrograph
d) none of these

Answer : A

Question. The time (in days) that crop takes from the instant of its sowing to that of its harvest, is known ........ period ?
a) kor
b) base
c) crop
d) None of the above

Answer : C

Question. In a canal section, which is in partial filling and partial cutting ?
a) the full supply level of the canal is above the natural surface level
b) the bed level of the canal is below the natural surface level
c) the full supply level of the canal is below the natural surface level
d) both a and b

Answer : D

Question. For Madras catchments, the flood discharge is estimated from Q = C * A (2/3) This forma known as ?
a) Ryve's formula
b) Dicken's formula
c) Nawab Jang Bahadur formula
d) Inglis formula

Answer : A

Question. A structure constructed in an irrigation canal for the purpose of wasting some of its water, known as a ?
a) fall
b) escape
c) regulator
d) none of these

Answer : B

Question. The amount of precipitation is measured by ?
a) rain gauge
b) osmoscope
c) turbidimeter
d) all of these

Answer : A

Question. Lining of a canal ?
a) assures economical water distribution
b) reduces possibility of breaching
c) increases available head for power generation
d) all of the above

Answer : D

Question. Which of the following statement is wrong ?
a) In Kennedy's silt theory, no account was taken of silt concentration and bed load
b) Kennedy did not gave any slope equation
c) In Kennedy's theory, silt grade and silt charge were not defined
d) none of the above

Answer : D

Question. The whole period of cultivation from the time when irrigation water is first supplied for preparation of the ground to its last watering before harvesting, is called ?
a) base period
b) crop period
c) kor period
d) none of these

Answer : A

Question. Check flooding method of irrigation is used for ?
a) closed growing crops
b) tracts with flat gradients
c) crops which can stand inundation of water for sometime
d) crops such as sugarcane, potatoes etc

Answer : C

Question. A canal aligned approximately parallel to the natural drainage of a country is called ?
a) side slope canal
b) water shed canal
c) contour canal
d) ridge canal

Answer : A

Question. The science which deals with the physical features and conditions of water on the earth is called ?
a) hydrome
b) hydrography
c) hydrosphere
d) hydraulics

Answer : B

Question. A sudden fall of level of ground along the alignment of a canal joined by an inclined bed is called a ?
a) rapid fall
b) cylinder fall
c) sudden fall
d) hydraulic jump

Answer : A

Question. When the irrigation canal and the drain are at the same level, then the cross drainage ?
a) syphon aqueduct
b) super-passage
c) level crossing
d) canal syphon

Answer : C

Question. A deflecting groyne in a river is ?
a) inclined towards upstream
b) perpendicular to bank
c) inclined towards downstream
d) none of these

Answer : B

Question. The main cause of silting in channel is ?
a) non-regime section
b) inadequate slope
c) defective head regulator
d) all of these

Answer : D

Question. Sandy soils with good drainage become impermeable after prolonged use, if it is irrigated with water containing ........ sodium ?
a) 25%
b) 50%
c) 75%
d) 85%

Answer : D

Question. The width of dowel is, usually, kept from ?
a) 0.1 m to 0.3 m
b) 0.3 m to 0.6 m
c) 0.6 m to 0.9 m
d) 0.9 m to 1.0 m

Answer : B

Question. Where steep land is available, the method of irrigation adopted is ?
a) free flooding
b) border flooding
c) check flooding
d) basin flooding

Answer : A

Question. The estimation of flood can be made ?
a) by physical indication of past floods
b) by flood discharge formula
c) by unit hydrograph
d) all of these

Answer : D

Question. For closed growing crops (such wheat), the method of irrigation used is ?
a) basin flooding
b) check flooding
c) free flooding
d) border flooding

Answer : D

Question. A part of water which exists in the porous space of the soil by molecular attraction, is known as ?
a) gravitational water
b) capillary water
c) hygroscopic water
d) all of these

Answer : B

Question. A groyne with a curved head is known as ?
a) burma groyne
b) denehy groyne
c) hockey groyne
d) none of these

Answer : C

Question. When an oven-dried sample of soil is kept open in the atmosphere, it absorbs some amount of water. This water is known as ?
a) hygroscopic water
b) gravitational water
c) capillary water
d) all of these

Answer : A

Question. The width of meandering belt is the ?
a) transverse distance between the apex point of one curve and apex point on reverse
b) transverse distance along the river between tangent point of one curve and tangent points other curve of same order
c) axial distance along the river between tangent point of one curve and tangent point other curve of same order
d) axial distance along the river between the apex point of one curve and apex point reverse curve

Answer : A

Question. The capacity of escape channel should not be less than ...... of the capacity of the channel at that point ?
a) 20%
b) 30%
c) 40%
d) 50%

Answer : D

Question. Which of the following statements is correct ?
a) The pattern of meander is altered by variation in discharge slope and bed forming material
b) The degrading type of river looses its bed gradually in the form of sediment load of the stream
c) The aggrading type of river builds up its bed to a certain slope
d) all of the above

Answer : D

Question. The most economical section of a lined canal is ?
a) triangular section with circular bottom for small discharges
b) rectangular section with circular bottom for small discharges
c) trapezoidal section with rounded corners for higher discharges
d) both b and c

Answer : A

Question. Outlet discharge for a particular crop is given by ?
a) Area / Outlet factor
b) Area x Outlet factor
c) Outlet factor / Area
d) none of these plains of

Answer : A

Question. Kennedy gave a relation between ?
a) velocity and hydraulic mean depth
b) area and velocity
c) critical velocity and the depth of flowing water
d) all of the above

Answer : C

Question. The sodium carbonate lining consists of at least ?
a) 6% sodium carbonate and 10% clay
b) 10% sodium carbonate and 6% clay
c) 1% sodium carbonate and 6% clay
d) 1% clay and 6% sodium carbonate

Answer : A

Question. A canal head work in rocky stage of a river is not suitable because ?
a) more cross drainage works are required
b) a costly head regulator is required
c) more falls are necessary to dissipate the energy
d) all of the above

Answer : D

Question. Gibb's module is a type of ?
a) non-modular outlet
b) semi-modular outlet
c) rigid modular outlet
d) open flume outlet

Answer : C

Question. The ratio of the head recovered to the head put in an outlet, is called ?
a) proportionality
b) flexibility
c) sensitivity
d) efficiency

Answer : D

Question. The method of irrigation used for orchards is ?
a) free flooding
b) border flooding
c) check flooding
d) basin flooding

Answer : D

Question. Water logging is caused due to ?
a) inadequate drainage facilities
b) over irrigation
c) presence of impermeable strata
d) all of these

Answer : D

Question. The level of a canal diversion head work depends upon ?
a) discharge perimeter
b) pond level
c) full supply level of canal
d) all of these

Answer : D

Question. In a flexible outlet, the discharge depends upon the ?
a) water level in distributary
b) water level in water course
c) difference of water levels between distributary and water course
d) none of the above

Answer : A

Question. The crops require maximum water during ?
a) first watering before sowing the crops
b) last watering before harvesting
c) first watering when the crop has grown a few centimetres
d) all of the above

Answer : C

Question. The Sarda canal has a ?
a) glacis type fall
b) vertical drop fall
c) Ogee fall
d) rapid fall

Answer : B

Question. The total depth of water required by a crop during the entire period the crop is in the field known as ?
a) delta
b) duty
c) base period
d) crop period

Answer : A

Question. Which of the salt present in water is harmful for cultivation purposes ?
a) Calcium sulphate
b) Potassium sulphate
c) Sodium carbonate
d) none of these

Answer : D

Question. The amount of water required to fill up the pore spaces in soil particles by replacing all air held in pore spaces, is known as ?
a) available moisture
b) field capacity
c) all of these
d) saturation capacity

Answer : D

Question. According to Khosla's theory, the exit gradient in the absence of a downstream cut-off ?
a) infinity
b) zero
c) none of these
d) unity

Answer : A

Question. The first watering before sowing the crop, is known as ?
a) delta
b) kor watering
c) paleo
d) none of these

Answer : C

Question. In a super-passage, the F.S.L. of the canal is ?
a) in level with the drainage trough
b) above the bed level of the drainage trough
c) lower than the underside of the trough carrying
d) none of the above

Answer : C

Question. An outlet is said to be proportional, if its flexibility is ?
a) less than unity
b) more than unity
c) equal to zero
d) equal to unity

Answer : D

Question. The sensitivity of an outlet is defined as the ratio of the ?
a) rate of change of discharge of an outlet to the rate of change of discharge of the distribution channel
b) rate of change of discharge of an outlet to the rate of change in level of the distribution surface, referred to normal depth of the channel
c) depth of the sill or the crest level of the module below the full supply of the distribution channel to the full supply depth of the distributing channel
d) head recovered to the head put in an outlet

Answer : B

Question. When the levels are such that the F.S.L. of the canal is much above the bed level of the trough, so that the canal runs under syphonic action under the trough, the structure provided is known ?
a) aqueduct
b) canal syphon
c) super aqueduct
d) level crossing

Answer : B