Soil Mechanics (Quiz 2) 4th Semester

Practically flow remains laminar in soils where size is less than that of

• Medium sand

• Boulder

• Silt

• Clay

• Colloid

Constant head permeameter is not preferable, rather variable head based test is used in soils of (a)   permeability.

ln= (a)   log

Superficial velocity is twice of apparent velocity and same as approach velocity

• TRUE

• FALSE

in standard AASHTO 2.5 lb rammer is dropped from a height of 305 mm and 25 blows are given per layer

• False

• TRUE

Performance specification compaction focuses only on the end result.

• TRUE

• FALSE

(a)   apparatus is used to measure consolidation in laboratory.

Time required to complete some degree of consolidation is (a)   proportional to co-efficient of permeability (directly/inversely)

Pore water pressure increases when load is suddenly applied and reduces the overall strength due to

• Reduction in particles' friction as water tries to push them away from each other

• Effective stress is reduced

• Both options are correct

The numerical which was solved in class was based on Chicago clays equation for compression index taken from an available table number 7.2

• TRUE

• FALSE