irrigation water resources engineering and hydrology Mcqs
101. The depth of water required to bring the soil moisture content of a given soil upto its field capacity is called_________________?
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A. pellicular water

B. soil moisture deficiency

C. equivalent moisture

D. hygroscopic water

102. A hydroelectric scheme operating under a head of 80 m will be classified as_____________?
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A. low head scheme

B. high head scheme

C. none of the above

D. medium head scheme

103. The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth is called________________?
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A. effective rainfall

B. consumptive irrigation requirement

C. net irrigation requirement

D. consumptive use

104. If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that______________?
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A. demand cannot be met by inflow

B. reservoir was not full at the beginning

C. both (A) and (B)

D. none of the above

105. Which of the following types of falls use parabolic glacis for energy dissipation ?
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A. glacis fall

B. vertical drop fall

C. inglis fall

D. Montague type fall
106. Main purpose of mean water training for rivers is________________?
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A. to provide sufficient depth of water in navigable channels, during low water periods

B. all of the above

C. flood control

D. to preserve the channel in good shape by efficient disposal of suspended and bed load
107. Horizontal acceleration due to earthquake results in______________?
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A. hydrodynamic pressure

B. inertia force into the body of the dam

C. both (A) and (B)

D. none of the above

108. Cyclonic precipitation is caused by lifting of an air mass due to________________?
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A. temperature difference

B. natural topographical barriers

C. pressure difference

D. all of the above

109. For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is________________?
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A. m/N

B. (N+l)/m

C. N/(m+l)

D. m/(N+l)

110. Which of the following canal outlets maintains a constant discharge ?
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A. rigid module

B. flexible outlet

C. none of the above

D. non-modular outlet

111. Coefficient of discharge of an ogee spillway________________?
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A. depends on depth of approach and upstream slope

B. depends on downstream apron interference and downstream submergence

C. remains constant

D. both (A) and (B)
112. The useful storage is the volume of water stored in the reservoir between________________?
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A. normal pool level and maximum pool level

B. minimum pool level and maximum pool level

C. minimum pool level and normal pool level

D. river bed and minimum pool level

113. Silt excluders are constructed on the________________?
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A. canal bed upstream of head regulator

B. canal bed downstream of head regulator

C. river bed upstream of head regulator

D. river bed downstream of head regulator

114. The net head under which the turbine reaches its peak efficiency at synchronous speed is called________________?
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A. operating head

B. rated head

C. design head

D. gross head

115. The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be__________________?
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A. 20 3/sec

B. 35 m3/sec

C. 30 m3/sec

D. 25 m3/sec
116. A divide wall is provided_______________?
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A. at an inclination to the axis of weir

B. parallel to the axis of weir and down-stream of it

C. parallel to the axis of weir and up-stream of it

D. at right angle to the axis of weir
117. For the upstream face of an earthen dam, the most adverse condition for stability of slope is_______________?
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A. sudden drawdown

B. sloughing of slope

C. during construction

D. steady seepage

118. As compared to gravity dams, earthen dams__________________?
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A. require sound rock foundations

B. are less susceptible to failure

C. require less skilled labour

D. are costlier

119. If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be__________________?
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A. 1/(1+ 0.9010)

B. 1 + (0.9)010

C. 1 (0.9)l0

D. 1/(1-0.910)
120. The runoff increases with________________?
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A. increase in intensity of rain

B. increase in infiltration capacity

C. all of the above

D. increase in permeability of soil

121. Presence of tail water in a gravity dam_____________?
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A. increases the shear stress

B. decreases the shear stress</strong>

C. increases the principal stress

D. correct answer is

E. decreases the principal stress

122. The shape of recession limb of a hydrograph depends upon________________?
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A. basin characteristics only

B. storm characteristics only

C. both (A) and (B)

D. none of the above

123. Variability of rainfall is____________?
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A. correct answer is?

B. largest in coastal areas

C. largest in regions of scanty rainfall</strong>

D. largest in regions of high rainfall
124. Hydrograph is the graphical representation of________________?
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A. rainfall and time

B. surface runoff and time

C. runoff and time

D. ground waterflow and time

125. A raingauge should preferably be fixed________________?
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A. in an open space

B. under the tree

C. in a closed space

D. near the building

126. The aqueduct or superpassage type of works are generally used when_______________?
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A. none of the above

B. high flood drainage discharge is large and short lived

C. high flood drainage discharge is small

D. high flood drainage discharge is large and continues for a long time

127. Lining of irrigation channels________________?
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A. increases the waterlogging area

B. decreases the waterlogging area

C. none of the above

D. does not change the water logging area

128. Which of the following can be used as a meter fall ?
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A. unflumed glacis fall

B. all of the above

C. vertical drop fall

D. flumed glacis fall

129. Interception losses are due to_______________?
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A. stream flow

B. evaporation

C. correct answer is?

D. transpiration

130. Select the incorrect statement ?
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A. all of the above

B. Extensive irrigation should be adopted in areas susceptible to water logging

C. Intensive irrigation should be avoided in areas susceptible to water logging

D. Lift irrigation increases water logging
131. The relation between probability (P) and recurrence interval (T) is given by_________________?
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A. P/T = 1

B. PT2 = 1

C. P/T2 = 1

D. PT = 1
132. For a flood control reservoir, the effective storage is equal to_______________?
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A. useful storage valley storage

B. useful storage + surcharge storage -valley storage

C. useful storage + surcharge storage + valley storage

D. useful storage + surcharge storage

133. The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be_________________?
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A. 1172 hectares/m3/sec

B. 637 hectares/m3/sec

C. 972 hectares/m3/sec

D. 837 hectares/m3/sec

134. A deep well_________________?
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A. is always deeper than a shallow well

B. has more discharge than a shallow well

C. is weaker structurally than a shallow well

D. both (A) and (B)

135. When surface of transpiration is submerged under water, then potential evapotranspiration is________________?
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A. equal to evapotranspiration

B. much more than evapotranspiration

C. much less than evapotranspiration

D. equal to or less than evapotranspi-ration

136. For a catchment area of 120 km2, the equilibrium discharge in m3/hour of an S-curve obtained by the summation of 6 hour unit hydro graph is_______________?
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A. 7.2 xlO6

B. 0.2 x 106

C. 2.4 xlO6

D. 0.6 x 106