Permeability MCQ

Test your knowledge with important Permeability MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Permeability MCQs at Bissoy

• Concentration of water-soluble sulphates in water ___________ ppm for severe exposure.
  ক

  <150

  খ

  150-1500

  গ

  150-10000

  ঘ

  >10000
• Concentration of water-soluble sulphates in water ___________ ppm for mild exposure.
  ক

  <150

  খ

  150-1500

  গ

  150-10000

  ঘ

  >10000
• The quality of concrete, specifically a ____________ cement content, is the best protection against sulphate attack.
  ক

  High

  খ

  Medium

  গ

  Low

  ঘ

  Very low
• The quality of concrete, specifically a ____________ w/c ratio, is the best protection against sulphate attack.
  ক

  High

  খ

  Medium

  গ

  Low

  ঘ

  Very low
• For concrete exposed to a very aggressive environment the w/c should be lower than __________
  ক

  1

  খ

  .5

  গ

  .4

  ঘ

  .8
• The quality of concrete, specifically a ____________ permeability, is the best protection against sulphate attack.
  ক

  High

  খ

  Medium

  গ

  Low

  ঘ

  Very low
• The philosophy of prescribing low ____________ cement to improve resistance to sulphate attack.
  ক

  C3S

  খ

  C3A

  গ

  C2S

  ঘ

  C4AF
• When the ____________ content is low, most ettringite will be formed in the plastic state.
  ক

  C3SS

  খ

  C3AA

  গ

  C2S

  ঘ

  C4AF
• Lowering of ____________ might also help, since this would reduce the amount of CH that forms.
  ক

  C3S

  খ

  C3A

  গ

  C2S

  ঘ

  C4AF
• The addition of a pozzolanic admixture such as fly ash reduces the ____________
  ক

  C3S

  খ

  C3A

  গ

  C2S

  ঘ

  C4AF
• The drainage property of silty clay is ________
  ক

  very good

  খ

  good

  গ

  fair

  ঘ

  very poor
• The linear dependency between velocity of flow and hydraulic gradient exists if effective size of soil _______
  ক

  does not exceed 3mm

  খ

  exceeds 3mm

  গ

  equal to 3mm

  ঘ

  equal to 5mm
• The critical Reynolds number varies from ________ for validity of Darcy’s law.
  ক

  0.1-75

  খ

  75-100

  গ

  100-175

  ঘ

  175-200
• Darcy’s law in some cases is not valid in ______
  ক

  clay

  খ

  silt

  গ

  fine sand

  ঘ

  coarse-gravel
• For Darcy’s law to be valid, the Reynolds number should be ________
  ক

  greater than one

  খ

  less than one

  গ

  equal to one

  ঘ

  greater than five
• Darcy’s law of linear dependency is valid for only _______ flow conditions in soil.
  ক

  laminar and turbulent

  খ

  laminar

  গ

  turbulent

  ঘ

  intermediate
• The coefficient of permeability is equal to velocity of flow when _________
  ক

  hydraulic gradient is equal to one

  খ

  hydraulic gradient is less than one

  গ

  hydraulic gradient is greater than one

  ঘ

  hydraulic gradient is equal to zero
• If the coefficient of percolation is 18*10-7cm/s and void ratio is 0.5, then the coefficient of permeability k is _________
  ক

  26*10-7cm/s

  খ

  6*10-7 cm/s

  গ

  3*10-7cm/s

  ঘ

  13*10-7cm/s
• If the coefficient of permeability of soil is 9*10-7cm/s and porosity is 0.33, then its coefficient of percolation is ______
  ক

  8*10-7cm/s

  খ

  27*10-7cm/s

  গ

  26*10-7cm/s

  ঘ

  13*10-7cm/s
• The relationship between coefficient of permeability and coefficient of percolation is ______
  ক

  kp=kn

  খ

  kp=ke

  গ

  kp=k/e

  ঘ

  kp=k/n
• The velocity of flow is proportional to _________ according to Darcy’s law.
  ক

  effective stress

  খ

  hydraulic gradient

  গ

  cohesion

  ঘ

  adhesion
• If the soil has discharge velocity is 9*10-7cm/s and the voids ratio of 0.5, then the seepage velocity will be _______
  ক

  18*10-7cm/s

  খ

  27*10-7cm/s

  গ

  16*10-7cm/s

  ঘ

  13*10-7cm/s
• If the discharge velocity is 4*10-7cm/s and the porosity is 33%, then the seepage velocity will be _______
  ক

  18*10-7cm/s

  খ

  12*10-7cm/s

  গ

  6*10-7cm/s

  ঘ

  3*10-7cm/s
• The unit coefficient of permeability is ______
  ক

  cm

  খ

  s

  গ

  cm/s

  ঘ

  cm/s2
• The coefficient of permeability of clean gravel is _________
  ক

  1*10-6 and smaller

  খ

  5*10-4 – 1*10-5

  গ

  1 – 1*10-2

  ঘ

  1 and greater
• Seepage velocity is inversely proportional to hydraulic gradient.
  ক

  True

  খ

  False
• The relation between discharge velocity and seepage velocity is ________
  ক

  Vs=Ve

  খ

  Vs=Vn

  গ

  Vs=V/e

  ঘ

  Vs=V/n
• In the definition of the seepage velocity, the cross-sectional area of the voids is taken as _______ to the direction of flow.
  ক

  parallel

  খ

  opposite

  গ

  perpendicular

  ঘ

  tangential
• Darcy’s law describes the state of flow within individual pores.
  ক

  True

  খ

  False