Civil Engineering - Soil Mechanics and Foundation Engineering

21. 

The zero atmospheric pressure is at

A. sea level
B. mean sea level
C. water table
D. phreatic surface
E. both (c) and (d) of the above.

Answer: Option E

Explanation:

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22. 

A soil mass coated with a thin layer of paraffin weighs 460 g. When immersed, it displaces 299 cc of water. The weight of paraffin is 10 g. If specific gravity of solids is 2.5 and that of paraffin 0.9, the void ratio of soil, is

A. 0.55
B. 0.60
C. 0.65
D. 0.70

Answer: Option B

Explanation:

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23. 

Pick up the incorrect definition from the following:

A. Ratio of the compressive strength of unconfined undisturbed soil to that of remoulded soil, is known as the sensitivity of the soil sample
B. The rotation of soil particles into stable state while remoulding, is known as the thiostropy of soil
C. The water content at which a soil changes from the liquid state to solid state, is known liquid limit of the soil
D. The water content at which a soil flows, is known plastic limit of the soil
E. None of these.

Answer: Option D

Explanation:

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24. 

In a fow net

A. flow lines and equipotential lines cross each other at right angles
B. fields are rectangles whose length is twice the breadth
C. smaller the dimensions of the field, smaller will be the hydraulic gradient and velocity of flow through it
D. for homogeneous soil, the curves are smooth and circular.

Answer: Option A

Explanation:

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25. 

The ratio of the volume of water present in a given soil mass to the total volume of its voids, is known

A. porosity
B. void ratio
C. percentage voids
D. degree of saturation.

Answer: Option D

Explanation:

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