Civil Engineering - Soil Mechanics and Foundation Engineering

26. 

Pick up the correct statement from the following:

A. The range of water content between the liquid limit and plastic limit, is called plasticity index.
B. The ratio of the liquid limit minus the natural water content to the plasticity index of soils, is called consistency index
C. The ratio of natural water content minus its plastic limit to its plasticity index is called liquidity index
D. The ratio between plasticity index and flow index (i.e. slope of flow curve in case of liquid limit), is called toughness index
E. All the above.

Answer: Option E

Explanation:

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27. 

'Talus' is the soil transported by

A. wind
B. water
C. glacier
D. gravitational force.

Answer: Option D

Explanation:

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28. 

A triaxial shear test is prefered to direct shear test, because

A. it can be performed under all three driange conditions with complete control
B. precise measurement of pore pressure and change in volume during test, is not posible
C. stress distribution on the failure plane, is non uniform
D. none of these.

Answer: Option A

Explanation:

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29. 

Pick up the correct statement from the following:

A. When stress decreases, void, ratio decreases
B. When stress decreases, coefficient of permeability decreases
C. When stress decreases, coefficient of volume change decreases
D. When stress decreases void ratio, co-effi-cients of per-meability and volume change decrease.

Answer: Option D

Explanation:

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30. 

Chemical weathering of soil is caused due to

A. oxidation
B. carbonation
C. hydration
D. leaching
E. all the above.

Answer: Option E

Explanation:

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