Deck 1: Irrigation and Water Management: Part A

Question 1

Which of the following methods of applying water may be used on rolling land ?

A)boarder flooding
B)check flooding
C)furrow flooding
D)free flooding

Answer 1

boarder flooding

Question 2

The value of Sodium Absorption Ratio for high sodium water lies between

A)0 to 10
B)10 to 18
C)18 to 26
D)26 to 34

Answer 2

18 to 26

Question 3

Optimum depth of kor watering for rice is

A)135 mm
B)165 mm
C)190 mm
D)215 mm

Answer 3

190 mm

Question 4

Irrigation water having the concentration of Na++ , Ca++ and Mg++ as 20, 3 and 1 Milli equivalent per litre respectively will be classified as

A)low sodium water
B)medium sodium water
C)high sodium water
D)very high sodium water

Question 5

The duty is largest

A)at the head of water course
B)on the field
C)at the head of a main canal
D)same at all places

Question 6

The "outlet discharge factor" is the duty at the head of

A)main canal
B)branch canal
C)watercourse
D)distributory

Question 7

The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be

A)637 hectares/m³/sec
B)837 hectares/m³/sec
C)972 hectares/m³/sec
D)1172 hectares/m³/sec

Question 8

For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for a capacity equal to the greater of the water requirement of

A)rabi or kharif
B)rabi and kharif or sugarcane
C)rabi and sugarcane or kharif and sugarcane
D)rabi or kharif or sugarcane

Question 9

The ratio of the quantity of water stored in the root zone of the crops to the quantity of water actually delivered in the field is known as

A)water conveyance efficiency
B)water application efficiency
C)water use efficiency
D)none of the above

Question 10

The water utilizable by plants is available in soils mainly in the form of

A)gravity water
B)capillary water
C)hydroscopic water
D)chemical water

Question 11

The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth is called

A)effective rainfall
B)consumptive use
C)consumptive irrigation requirement
D)net irrigation requirement

Question 12

With the increase in the quantity of water supplied, the yield of most crops

A)increases continuously
B)decreases continuously
C)increases upto a certain limit and then becomes constant
D)increases upto a certain limit and then decreases

Question 13

Hydrograph is the graphical representation of

A)runoff and time
B)surface runoff and time
C)ground waterflow and time
D)rainfall and time

Question 14

Infiltration rate is always

A)more than the infiltration capacity
B)less than the infiltration capacity
C)equal to or less than the infiltration capacity
D)equal to or more than the infiltration capacity

Question 15

The depth of water required to bring the soil moisture content of a given soil upto its field capacity is called

A)hygroscopic water
B)equivalent moisture
C)soil moisture deficiency
D)pellicular water

Question 16

Infiltration capacity

A)is a constant factor
B)changes with time
C)changes with location
D)changes with both time and location

Question 17

Infiltration is the

A)movement of water through the soil
B)absorption of water by soil surface
C)both (a) and (b)
D)none of the above

Question 18

If the intensity of rainfall is more than the infiltration capacity of soil, then the infiltration rate will be

A)equal to rate of rainfall
B)equal to infiltration capacity
C)more than rate of rainfall
D)more than infiltration capacity

Question 19

Cyclonic precipitation is caused by lifting of an air mass due to

A)pressure difference
B)temperature difference
C)natural topographical barriers
D)all of the above

Question 20

Which of the following is a non-recording raingauge ?

A)tipping bucket type raingauge
B)Simon's raingauge
C)Steven's weighing type raingauge
D)floating type raingauge

Question 21

A raingauge should preferably be fixed

A)near the building
B)under the tree
C)in an open space
D)in a closed space

Question 22

Which of the following types of rain gauges is used for measuring rain in remote hilly inaccessible areas ?

A)tipping bucket type
B)weighing type
C)floating type
D)Simon's raingauge

Question 23

Rate of evaporation from a water surface increases if
(i. difference of vapour pressure between water and air is increased
(ii. velocity of wind is decreased
(iii) concentration of soluble solids in water is decreased
The correct answer is

A)(i) and (ii)
B)(i) and (iii)
C)(ii) and (iii)
D)(i). (ii) and (iii)

Question 24

A 70% index of wetness means

A)rain excess of 30%
B)rain deficiency of 30%
C)rain deficiency of 70%
D)none of the above

Question 25

Under the same conditions, which of the following shapes of water surface will give the highest rate of evaporation ?

A)flat water surface
B)convex water surface
C)concave water surface
D)independent of shape of water surface