Irrigation Engineering Set 16 MCQs

Q1 | The graphical representation of average rainfall and rainfall excess (i.e. rainfall minus infiltration) rates over specified areas during successive unit time intervals during a storm is known as

hydrograph

unit hydrograph

hyetograph

none of these

Q2 | The maximum depth in soil strata, in which the crop spreads its root system, and derives water from the soil, is called

kot depth

root zone depth

delta

overlap allowance

Q3 | In a canal section, which is in partial filling and partial cutting

the full supply level of the canal is above the natural surface level

the bed level of the canal is below the natural surface level

the full supply level of the canal is below the natural surface level

the bed level of the canal is above the natural surface level

Q4 | The free board in a channel is governed by the

size of the canal

location of the canal

water surface fluctuations

all of these

Q5 | According to Khosla's theory, the exit gradient in the absence of a downstream cut-off is

zero

unity

infinity

none of these

Q6 | Which of the following statement is wrong?

The impermeable groynes do not permit any flow through them.

The impermeable groynes may be constructed by a core of locally available material like sand, clay and gravel.

The permeable groynes dampen the velocity and reduce the erosive action of the stream.

none of the above

Q7 | Water logging takes place due to

rise

fall

Q8 | Outlet discharge for a particular crop is given by

Area / Outlet factor

Outlet factor / Area

Area x Outlet factor

none of these

Q9 | Which of the following statements is wrong?

Seepage drains reduce the chances of water logging.

The water table generally follows the ground surface above it with a few exceptions.

At the water table, the hydrostatic pressure is zero.

Water logging makes the land more productive.

Q10 | A groyne

contracts a river channel to improve its depth

silts up the area in the vicinity by creating a slack flow

trains the flow along a certain course

all of the above

Q11 | An aggrading river is a

scouring

silting

Q12 | The consumptive use of water of a crop

is measured as the volume of water per unit area

is measured as depth of water on irrigated area

may be supplied partly by precipitation and partly by irrigation

all of the above

Q13 | A deflecting groyne has a much

longer

shorter

Q14 | Which of the following method is useful for obtaining values of flood discharges for a high recurrence interval?

California method

Hazen's method

Gumbel's method

all of these

Q15 | The first watering, when the crop has grown a few centimetres, is called paleo.

Agree

Disagree

Q16 | A river training work is generally required when the river is

aggrading type

degrading type

meandering type

stable type

Q17 | The narrow strip of land left at the ground level between the inner toe of the bank and top edge of the cutting, is known as

free board

dowel

inspection roadway

berm

Q18 | Run-off is measured in

m3/s

m3/min

m3/h

none of these

Q19 | Irrigation is said to be a science of survival.

Correct

Incorrect

Q20 | According to Lacey

the silt is kept in suspension due to the force of vertical eddies

the eddies are generated from bed and sides, both normal to the surface of generation

the vertical component of eddies generated from sides will also support the silt

all of the above

Q21 | The height of dowel above the road level should not be more than

10 cm

20 cm

30 cm

40 cm