WorksheetsDay 75-Dec 10-worksheet-Btech-Permeability of soils part 2
Total questions: 15
Worksheet time: 12mins
A tracer test gives seepage velocity = 1 m/day, porosity = 15%,i=0.03. Coefficient of permeability is:
(a)
Terminal velocity ∝ D2 . If a 0.075 mm grain settles at 0.5 mm/s, a 0.0075 mm grain settles at:
(a)
Increase in temperature decreases viscosity; hence permeability increases. Choose the correct evaluation.
True
False
Adsorbed water on clay particles increases permeability. Choose the correct evaluation.
True
False
Assertion (A): Dispersed soils have lower permeability. Reason (R): Parallel particle alignment reduces void spaces. Choose the correct option.
A and R true; R explains A
A and R true; R does not explain A
A true, R false
A false, R true
D10 represents the ________.
Effective grain size
Uniformity coefficient
Mean grain size
Coefficient of curvature
If viscosity becomes half, permeability becomes (a) times.
Liquidity index for WL = 60%, WP = 25%, w = 18% equals (a) .
Activity of clay equals ________.
0.7
1.0
1.4
2.0
Time for water level drop of 0.75 m (k = 10−2 m/s) equals (a) seconds.
Permeability of clay decreases when covered by ________ water.
Gravitational water
Capillary water
Adsorbed water
Artesian water
Permeability of flocculated clay is (a) than dispersed clay.
Darcy's law applies when flow is ________ and soil is ________ saturated.
(a)
Liquidity index compares natural water content with the (a) limit.
Shrinkage limit is the water content at which soil ________ shrinking.
Ceases
Begins
Accelerates
Reverses
