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GATE CE 2021: Soil Mechanics & Foundation Engineering#5 (App update required to attempt this test)

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Question 1

A soil mass has coefficients of horizontal and vertical permeability as 8 x 10-7 cm/s and 2 x 10-7 cm/s, respectively. The transformed coefficient of permeability of an equvivalent isotropic soil mass is

Question 2

Velocity of flow is proportional to the first power of hydraulic gradient in Darcy's law. This is law is applicable to

Question 3

A sand sample of 35 m2 cross sectional area and 20 cm long was tested in a constant head permeameter. Under a head of 60 km, the discharge was 120 ml in 6 min. The dry unit weight of sand used for the test was 1120 g. and GS = 2.68 Take Sw = 1 g/cm3

The hydraulic conductivity (in cm/sec) is ___ x 10-3.

Question 4

Water flows from P to Q through two soil samples, Soil 1 and Soil 2, having cross sectional area of 80cm2 as shown in the figure. Over a period of 15 minutes, 200 ml of water was observed to pass through any cross-section. The flow conditions can be assumed to be steady state. If the coefficient of permeability of Soil 1 is 0.02 mm/s, the coefficient of permeability of Soil 2 (expressed in mm/s) would be ____.

Question 5

Permeability tests were carried out on the samples collected from two different layers as shown in the figure (not drawn to the scale). The relevant horizontal (kh) and vertical (kv) coefficients of permeability are indicated for each layer.

The ratio of the equivalent horizontal to vertical coefficients of permeability, is

Question 6

In a falling head permeability test, head causing flow was initially 50 cm and it drops 2 cm in 5 minutes. The time required for the head to fall to 25 cm is __________min.
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Sep 14ESE & GATE CE