Civil Engineering - Soil Mechanics and Foundation Engineering

41. 

The compressibility of clays, is caused due to:

A. expulsion of double layer water from in between the grains
B. sliping of particles to new positions of greater density
C. bending of particles as elastic sheets
D. all the above.

Answer: Option D

Explanation:

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42. 

A phreatic line is defined as the line within a dam section below which there are

A. positive equipotential lines
B. positive hydrostatic pressure
C. negative hydrostatic pressure
D. negative equipotential lines
E. none of these.

Answer: Option B

Explanation:

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43. 

The ratio of the difference between the void ratio of the soil in its loosest state and its natural void ratio (e) to the difference between the void ratios in the loosest and fully dense state, is generally termed as

A. degree of density
B. relativity
C. density index
D. all the above.

Answer: Option D

Explanation:

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44. 

Pick up the correct statement from the following:

A. The property of a soil that enables it to become stiff in a relatively short time on standing is called thixotropy
B. The ratio of shear strength in natural state to the remoulded shear strength under undrained conditions, is called degree of sensitivity.
C. The difference between the undisturbed shear strength and remoulded shear strength is known remoulding loss
D. The tendency of dense sand to expand on application of shearing load, is known as dilatancy
E. All the above.

Answer: Option E

Explanation:

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45. 

According to the Indian Standards the specific gravity is the ratio of the unit weight of soil solids to that of water at a temperature of

A. 17°C
B. 23°C
C. 27°C
D. 30°

Answer: Option C

Explanation:

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