Q.1
During the maintenance of an earthen dam, the apparent seepage through the foundation of the dam is best taken care of by providing ______________________
  • a) chimney drain
  • b) rock toe
  • c) drain trench along the downstream toe
  • d) upstream impervious cut-off
Q.2
The base width of a rock-fill dam in comparison to that of an earthen dam is _______________
  • a) much larger
  • b) much smaller
  • c) sometimes large sometimes smaller
  • d) almost equal
Q.3
On moderate foundations and particularly in seismic areas, the type of dam which can preferably be considered for construction is ___________________
  • a) masonry gravity dam
  • b) earthen dam
  • c) rock-fill dam
  • d) arch dam
Q.4
According to Terzaghi, the ratio of Dof filter to Dof base material should be _____________
  • a) > 5
  • b) < 4
  • c) 4 to 5
  • d) < 5
Q.5
Which of the following is not provided in order to control the possibility of sand boiling?
  • a) Relief wells
  • b) Drain trenches
  • c) Vertical cut-offs
  • d) Berms
Q.6
The seepage forces within the filter are controlled up to permissible small magnitudes when the ratio of Dof filter to Dof base material is ___________________
  • a) between 5 to 40
  • b) less than 5
  • c) between 5 to 20
  • d) less than 4
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