Hydrology and Ground Water

121. Seepage through foundation in an earthen dam is controlled by providing

  1. Rock toe
  2. Horizontal blanket
  3. Impervious cut off
  4. Chimney drain

Correct answer: (C)
Impervious cut off

122. Select the correct statement.

  1. A meander increases the river length but a cut off reduces the river length
  2. A cut-off increases the river length but a meander reduces the river length
  3. Both meander and cut-off increase the river length
  4. Both meander and cut-off decrease the river length

Correct answer: (A)
A meander increases the river length but a cut off reduces the river length

123. Select the incorrect statement.

  1. Intensive irrigation should be avoided in areas susceptible to water logging
  2. Extensive irrigation should be adopted in areas susceptible to water logging
  3. Lift irrigation increases water logging
  4. All of the above

Correct answer: (C)
Lift irrigation increases water logging

124. Sharp crested weirs are generally used

  1. For large flows
  2. For small flows
  3. For streams carrying high sediment loads
  4. For rivers carrying floating debris

Correct answer: (A)
For large flows

125. Shrouding is provided in

  1. Cavity type tube wells
  2. Slotted type tube wells
  3. Strainer type tube wells
  4. Perforated type tube wells

Correct answer: (B)
Slotted type tube wells

126. Silt excluders are constructed on the

  1. River bed upstream of head regulator
  2. River bed downstream of head regulator
  3. Canal bed upstream of head regulator
  4. Canal bed downstream of head regulator

Correct answer: (A)
River bed upstream of head regulator

127. Which of the following methods is used to estimate flood discharge based on high water marks left over in the past?

  1. Slope-area method
  2. Area-velocity method
  3. Moving boat method
  4. Ultrasonic method

Correct answer: (A)
Slope-area method

128. Symon's rain gauge is

  1. Tipping-bucket gauge
  2. Weighing type gauge
  3. Float recording gauge
  4. Non-recording gauge

Correct answer: (D)
Non-recording gauge

129. The aqueduct or super-passage type of works are generally used when

  1. High flood drainage discharge is small
  2. High flood drainage discharge is large and short lived
  3. High flood drainage discharge is large and continues for a long time
  4. None of the above

Correct answer: (A)
High flood drainage discharge is small

130. The area of a drainage basin whose axial length is 100 km is 2500 sq. km. Its form factor is

  1. 0.1
  2. 0.2
  3. 0.25
  4. 0.35

Correct answer: (C)
0.25

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