Geotechnical Engineering MCQ Unit 2 | Basic Civil Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Geotechnical Engineering”.

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                                                                          UNIT 2


  • Consider the following statements about the properties of flow nets :
  • Flow lines are perpendicular to equipotential lines
  • No two flow lines or equipotential lines start at same point
  • No two flow lines cross each other

Of these statement :

  • 1,2 and 3 are correct
  • 2 and 3 are correct
  • 1 and 2 are correct
  • 1 and 3 are correct


  • A flow net drawn is obtained 
  • seepage, coefficient of permeability and uplift pressure
  • coefficient of permeability, uplift pressure and exit gradient
  • exit gradient, uplift pressure and seepage quantity
  • exit gradient, seepage and coefficient of permeability


  • If the flow net of a coffer dam foundation had six number of flow channels and sixteen numbers of equipotential drops, with the head water lost during seepage being 6 m through the foundation having K = 4 X 10-5 m/min., the seepage loss ( in m3/day) per meter of a dam will be …..
  • 2.16 X 10-3
  • 6.48 X 10-3
  • 12.96 X 10-2
  • 25.92 X 10-2


  • A flow net an earth dam on impervious foundation consist of 4 flow channels and 15 equipotential drops. The full reservoir level is 15 m above the downstream horizontal filter. Given that horizontal permeability is 9 X 10-6 m/s and vertical permeability is 1 X 10-6 m/s, the quantity of seepage through the dam will be …
  • 36 ml/s/m
  • 25 ml/s/m
  • 20 ml/s/m
  • 15 ml/s/m

(a) 


5) A flow net of a coffer dam foundation has 6 flow channels and 18 equipotential drops. The head of water lost during seepage is 6 m . If the coeff. Of permeability of foundation is 4 X 10-5 m/min, then seepage loss per length of dam will be

(a) 2.16 X 10-2 m3 / day

(b) 6.48 X 10-2 m3 / day

(c) 11.52 X 10-2 m3 / day

(d) 34.56 X 10-2 m3 / day

ANS :(c)


6)For an anisotropic soil , permeabilities in x and y direction are kx and ky respectively in two dimensional flow. The effective permeability keq for a soil is given by

(a) kx + ky 

(b) kx / ky

(c) (kx2 + ky2)1/2

(d) (kx .ky)1/2


7)A soil mass has coefficient of horizontal and vertical permeability as 9 X 10-7 cm/s and 4 X 10-7 cm/s, respectively. The transformed coeff. Of permeability of an equivalent isotropic soil mass is…

(a) 9 X 10-7 cm/s

(b) 4 X 10-7 cm/s

(c) 13 X 10-7 cm/s

(d) 6 X 10-7 cm/s


8)According to Darcy’s law for flow through porous media, the velocity is proportional to …

(a) effective stress

(b) hydraulic gradient

(c) cohesion

(d) stability number


9)Piping in soil occurs when ….

(a) the soil is highly porous 

(b) suddenly change in permeability occurs

(c) effective pressure becomes zero

(d) the soil is highly stratified


10)The upward movement of a solid is called ….

(a) heaving

(b) swelling

(c)creep

(d) n.o.t


11) Seepage force per unit volume (j) can be expressed as  …

(a) i ΥW L

(b) i L

(c) ΥW h

(d) i ΥW

Where i-hydraulic gradient, L-length of soil sample h-hydraulic head, ΥW – unit weight of water


12) Consider the following statement :

(1) Hydraulic gradient require to initiate “quick” condition is independent of ratio of volume of void to volume of solid in mass.

(2)Increasing the length of flow path of water can prevent initiation of piping under hydraulic structure

(3)Seepage pressure is independent of the coefficient of permeability

Of these statements:

  • 1,2 and 3 are correct
  • 1 and 2 are correct
  • 1 and 3 are correct
  • 2 and 3 are correct


13) A stress of 3.5m thick fine sand has a void ratio 0.7 and G is 2.7. For a quick sand condition to develop in this strata , the water flowing in upward direction would require the head of……

(a) 7 m

(b) 5.56 m

(c) 5 m

(d)3.5 m


14) For a soil void ratio = 0.7 and specific gravity of solid 2.7 , the head required to cause quicksand over a column of 5 m high sand will be ……

(a) 3.5

(b) 4.5

(c) 5

(d) 9


15) If the critical hydraulic gradient of a soil is 1 and specific gravity is 2.7, then the void ratio will be ….

(a) 0.58

(b) 0.7

(c) 1.7

(d) 2.7


18) A flownet drawn from a weir. The total head loss is 6 m. number of potential drop is 10 and the length of flow path for the last square is 1 m . The exit gradient is ……

(a) 0.6

(b) 0.7

(c) 1.0

(d) 1.6


19)The following data were obtained when a sample of medium send was tested in a constant head parameter :

cross-sectional gradient : 100 cm2

Discharge collected : 10 cc/s

Hydraulic gradient : 10

The coeff. Of permeability of a sand is 

  • 0.1 m/s
  • 0.01 m/s
  • 1 X 10-4 m/s
  • 1 X 10-8 m/s


20) Read the following statement :

  • The capillary pressure held above the water table results in attractive forces between the particles and it is known as suction pressure
  • Seepage pressure is due to frictional force acting on surface of grains
  • Permeability decreases with a disperse clay structure

Of these statements :

  • 1 and 2 are correct
  • 3 and 2 are correct
  • 1 and 3 are correct
  • 1,2 and 3 are correct


21) A homogenous anisotropic earth is 20 m high , is constructed on an impermeable foundation. The coeff. Of permeability of soil is used for the construction of dam . in the horizontal and vertical direction are 4.8 X 10-8 m/s and 1.6 X 10-8 m/s respectively . The water level on the reservoir side is at 18 m from the base of the dam. Downstream side is dry . It is seen that there are 4 flow channels and 18 equipotential drops in a square flow net drawn in transformed dam section .Estimate the quantity of seepage per unit length in m3/s through the dam.


22) For a practically impervious type of soil , the coeff. Of permeability is determined using

  • variable head test
  • constant head test
  • consolidation test
  • pumping test


23) Consider the following statement regarding confined aquifers :

  • The aquifers is bound at top and below by impervious strata
  • The pressure of water is greater than atmospheric pressure 
  • A tubewell sunk in such an aquifer starts flowing always by itself
  • The aquifer is fully saturated

Of these statements:

  • 1,2 and 3 are correct
  • 4,2 and 3 are correct
  • 1,2 and 4 are correct
  • 1,4 and 3 are correct



Location: India

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