Soil Mechanics And Foundation(Civil Engineering ) Questions and Answers

Question 1. Clay layer A with single drainage and coefficient of consolidation Cv takes 6 months to achieve 50% consolidation. The time taken by clay layer B of the same thickness with double drainage and coefficient of consolidation $$\frac{{{\text{Cv}}}}{2}$$ to achieve the same degree of consolidation is
  1.    3 months
  2.    6 months
  3.    12 months
  4.    24 months
Explanation:-
Answer: Option A. -> 3 months
Question 2. Degree of consolidation is
  1.    directly proportional to time and inversely proportional to drainage path
  2.    directly proportional to time and inversely proportional to square of drainage path
  3.    directly proportional to drainage path and inversely proportional to time
  4.    directly proportional to square of drainage path and inversely proportional to time
Explanation:-
Answer: Option B. -> directly proportional to time and inversely proportional to square of drainage path
Question 3. Select the correct range of density index, 1D
  1.    1D > 0
  2.    1D ≥ 0
  3.    0 < 1D < 1
  4.    0 ≤ 1D ≤ 1
Explanation:-
Answer: Option D. -> 0 ≤ 1D ≤ 1
Question 4. For a loose sand sample and a dense sand sample consolidated to the same effective stress
  1.    ultimate strength is same and also peak strength is same
  2.    ultimate strength is different but peak strength is same
  3.    ultimate strength is same but peak strength of dense sand is greater than that of loose sand
  4.    ultimate strength is same but peak
Explanation:-
Answer: Option C. -> ultimate strength is same but peak strength of dense sand is greater than that of loose sand
Question 5. The hydraulic head that would produce a quick condition in a sand stratum of thickness 1.5 m, specific gravity 2.67 and voids ratio 0.67 is equal to
  1.    1.0m
  2.    1.5m
  3.    2.0m
  4.    3m
Explanation:-
Answer: Option B. -> 1.5m
Question 6. Which of the following statements is correct?
  1.    Uniformity coefficient represents the shape of the particle size distribution curve.
  2.    For a well graded soil, both uniformity coefficient and coefficient of curvature are nearly unity.
  3.    A soil is said to be well graded if it has most of the particles of about the same size
  4.    none of the above
Explanation:-
Answer: Option D. -> none of the above
Question 7. Rise of water table above the ground surface causes
  1.    Equal increase in pore water pressure and total stress
  2.    Equal decrease in pore water pressure and total stress
  3.    Increase in pore water pressure but decrease in total stress
  4.    Decrease in pore water pressure but increase in total stress
Explanation:-
Answer: Option A. -> Equal increase in pore water pressure and total stress
Question 8. In a consolidated drained test on a normally consolidated clay, the volume of the soil sample during shear
  1.    decreases
  2.    increases
  3.    remains unchanged
  4.    first increases and then decreases
Explanation:-
Answer: Option A. -> decreases
Question 9. The effect of cohesion on a soil is to
  1.    reduce both the active earth pressure intensity and passive earth pressure intensity
  2.    increase both the active earth pressure intensity and passive earth pressure intensity
  3.    reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity
  4.    increase the active earth pressure in-tensity but to reduce the passive earth pressure intensity [GATE 99]
Explanation:-
Answer: Option C. -> reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity
Question 10. The hydrometer method of sedimentation analysis differs from the pipette analysis mainly in
  1.    the principle of test
  2.    the method of taking observations
  3.    the method of preparation of soil suspension
  4.    all of the above
Explanation:-
Answer: Option B. -> the method of taking observations
© Lakshya_Education.com, All Right Reserved.
Contact Us services