Test: Soil Exploration
10 Questions MCQ Test GATE Civil Engineering (CE) 2023 Mock Test Series | Test: Soil Exploration
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Consider the following statements:
1. The soil obtained from wash boring is a representative sample.
2. Recovery ratio will be high during drilling in sound rock.
3. Hollow stem augers are sometimes used to. drill holes in silty sand.
Which of these statements is/are correct?
1. The soil obtained from wash boring is a representative sample.
2. Recovery ratio will be high during drilling in sound rock.
3. Hollow stem augers are sometimes used to. drill holes in silty sand.
Which of these statements is/are correct?
Soil samples obtained from auger borings and wash borings are non-representative samples. Non-representative samples consist of mixture of materials from various soil or rock strata or are samples from which some mineral constituents have been lost or got mixed up.
Consider the following statements:
On addition of lime to swelling soils,
1. their liquid limit increases
2. their plastic limit increases
3. their shrinkage limit increases
4. their swelling potential decreases
Which of these statements are correct?
On addition of lime to swelling soils,
1. their liquid limit increases
2. their plastic limit increases
3. their shrinkage limit increases
4. their swelling potential decreases
Which of these statements are correct?
During a sampling operation, the drive sampler is advanced 600 mm and the length of the sample recovered is 525 mm. What is the recovery ratio of the sample?
Recovery ratio is defined as,
This indicates (Rr < 1) that the sample is compressed.
Match List-I (Unit) with List-ll (Purpose) and select the correct answer using the codes given below the lists:
List-I
A. Graded filter
B. Lime treatment
C. Impervious clay core
D. Curtain grouting
List-ll
1. To reduce seepage of water through body of earth dam
2. To reduce water seepage through foundation below dam
3. To stabilize black cotton soils
4. To drain water without losing fines from the soil
Match List-I (Type of exploration) with List-ll (Soil profile) and select the correct answer using the codes given below the lists:
List-I
A. Diamond core drilling
B. Uncased wash boring
C. Open pit excavation
D. Cased boring
List-ll
1. Medium strong cohesive soils
2. Rocky formation
3. Soft cohesive soils and cohesionless soils. Exploration up to relatively large depths
4. Exploration up to a shallow depth below ground level
The correct sequence of the increasing order of the disturbance to soil samples obtained from chunk, piston, split spoon and remoulded sampler is
Piston sampler causes minimum disturbance and remoulded sampler tends to disturb the soil structure completely.
A soil sampler has inner and outer radii of 25 mm and 30 mm, respectively. The area ratio of the sampler is
Which technique of stabilization for sub base is preferred for heavy plastic soils?
The lime stabilised bases or sub-bases form a water resistant barrier which stops penetration of rain water.
For heavy plastic soils large quantity of asphalt and cement is required hence stabilization through bitumen and cement is not preferred.
Mechanical stabilization of the soil is done with the help of
Mechanical stabilisation is the process of improving the properties of the soil by changing its gradation. Two or more types of natural soil are mixed to obtain a composite material which is superior to any of its components. To achieve the desired grading, sometimes the soil with coarse particles are added or the soils with fine particles are removed.
For obtaining good quality undisturbed samples, the area ratio should be 10 per cent or less.
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