irrigation water resources engineering and hydrology MCQs – Page 6

Practise focused irrigation water resources engineering and hydrology questions with marked answers for exam preparation and subject revision.

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

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