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Foundation Engineering PYQ – TN TRB Lecturer

      

31. An isobar is a curve joining points of equal _____ .

[TN TRB 2021: 1 Mark]

  1. Vertical stress
  2. Horizontal stress
  3. Maximum vertical stress
  4. Zero vertical stress
Answer: Option A
Explanation:
An isobar is a curve joining points of equal vertical stress below the ground surface.

32. As per Indian code of practice, the maximum permissible settlement for isolated footing in sand is _____ .

[TN TRB 2021: 1 Mark]

  1. 40 mm
  2. 65 mm
  3. 50 mm
  4. 25 mm
Answer: Option A (or) Option C
Explanation:

  • As per IS 1904 (1986) Table 1, the maximum permissible settlement for isolated footing in sand is 50 mm.
  • As per IS 1904 (1966), the maximum permissible settlement for isolated footing in sand is 40 mm.

33.  The maximum value of adhesion factor for very soft clay is _____ .

[TN TRB 2021: 1 Mark]

  1. 1
  2. 0.3
  3. 0.7
  4. 0
Answer: Option A
Explanation:
From IS 2911 (Part 1/ Sec 1): 2010 Fig 2, the adhesion factor for clay varies from 0 to 1.

34.  When the retaining wall tends to move towards the soil, the soil mass is compressed and develops _____ .

[TN TRB 2021: 1 Mark]

  1. Active earth pressure
  2. Passive earth pressure
  3. Neutral pressure
  4. Both neutral and passive pressure
Answer: Option B
Explanation:
Passive earth pressure occurs when the retaining wall moves towards the soil, resulting in the compression of soil mass.

35.  A good quality of undisturbed soil sample can be obtained using a sampling tube having an area ratio of _____ .

[TN TRB 2021: 2 Marks]

  1. 16%
  2. 7%
  3. 21%
  4. 28%
Answer: Option B
Explanation:
As per IS 1892 (1979) Clause 4.1.1, the area ratio should be kept as low as possible consistent with the strength requirements of the sample tube. Its value should not be greater than about 20 percent for stiff formations; for soft sensitive clays an area ratio of 10 percent or less should be preferred.

36.  The critical height of an unsupported vertical cut in a purely cohesive soil is _____ , where C – cohesion, 𝛾 – Unit weight of soil

[TN TRB 2021: 1 Mark]

  1. 4C/𝛾
  2. 2C/𝛾
  3. 4𝛾/C
  4. 8C/𝛾
Answer: Option A
Explanation:
In a purely cohesive soil, the critical height of an unsupported vertical cut is
hc = 4C/γ

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