# Civil Engineering - Soil Mechanics and Foundation Engineering

### Exercise :: Soil Mechanics and Foundation Engineering - Section 4

26.

Stoke's law does not hold good if the size of particle is smaller than

 A. 0.0002 mm B. 0.002 mm C. 0.02 mm D. 0.2 mm

Explanation:

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27.

In a purely cohesive soil, the critical centre lies at the intersection of

 A. perpendicular bisector of slope and the locus of the centre B. perpendicular drawn at l/3rd slope from toe and the locus of the centre C. perpendicular drawn at 2/3rd slope from toe and the locus of the centre D. directional angles E. none of these.

Explanation:

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28.

The angle of internal friction, is least for

 A. angular-grained loose sand B. angular -grained dense sand C. round-grained loose sand D. round-grained loose sand E. clays.

Explanation:

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29.

In non-cohesive soil in passive state of plastic equilibrium

 A. major principal stress is horizontal B. minor principal stress is vertical C. major principal stress is vertical D. minor and major principal stresses are equally inclined to the horizontal.

Explanation:

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30.

In active state of plastic equilibrium in a non cohesive soil with horizontal ground surface

 A. major principal stress is horizontal B. minor principal stress is vertical C. major principal stress is vertical D. minor and major principal stresses are equally inclined to horizontal.