Soil Mechanics and Foundation Engineering

21. A partially saturated sample of soil has a unit weight of 2.0 g/cm3 and specific gravity of soil particles is 2.6. If the moisture content in the soil is 20%, the degree of saturation is

  1. 20 %
  2. 77 %
  3. 92 %
  4. None

Correct answer: (C)
92 %

22. A partially saturated soil is classified as

  1. One phase soil
  2. Two phase soil
  3. Three phase soil
  4. Four phase soil

Correct answer: (C)
Three phase soil

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

  1. Positive equipotential lines
  2. Positive hydrostatic pressure
  3. Negative hydrostatic pressure
  4. Negative equipotential lines

Correct answer: (B)
Positive hydrostatic pressure

24. A pile is being driven with a drop hammer weighing 1800 kg and having a free fall of 1.00 m. If the penetration with last blow is 5 mm, the load carrying capacity of the pile, -according to the Engineering News formula, is

  1. 100 tonnes
  2. 50 tonnes
  3. 20 tonnes
  4. 10 tonnes

Correct answer: (D)
10 tonnes

25. A plane inclined at an angle 'φ' to the horizontal at which the soil is expected to stay in the absence of any lateral support, is known as

  1. Natural slope line
  2. Repose line
  3. The φ line
  4. All the above

Correct answer: (D)
All the above

26. A pycnometer is used to determine

  1. Voids ratio
  2. Dry density
  3. Water content
  4. Density index

Correct answer: (C)
Water content

27. A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant active earth pressure will act at a distance of 2 m above the base and inclined to the horizontal at an angle of

  1. 7°
  2. 10°
  3. 12°
  4. 17°

Correct answer: (C)
12°

28. A sample of saturated soil has 30% water content and the specific gravity of soil grains is 2.6. The dry density of the soil mass in g/cm3, is

  1. 1.47
  2. 1.82
  3. 1.91
  4. None of these

Correct answer: (D)
None of these

29. A saturated soil sample has water content of 40% and specific gravity of soil particles 2.7. The void ratio of the soil, is

  1. 0.4
  2. 0.52
  3. 1.08
  4. None of these

Correct answer: (C)
1.08

30. A soil has a bulk density of 22 kN/m3 and water content 10 %. The dry density of soil is

  1. 18.6 kN/m3
  2. 20.0 kN/m3
  3. 22.0 kN/m3
  4. 23.2 kN/m3

Correct answer: (B)
20.0 kN/m3

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