Engineering Questions with Answers - Multiple Choice Questions

# Geotechnical Engineering MCQs – Particle Size Distribution Curve

1 - Question

1. A soil sample may be well graded if __________ a) If it has most number of particles of same size b) Excess of certain particles c) Good representation of particles of all size d) None of the mentioned

2 - Question

2. For coarse grained soil, the particle size D10 is sometimes called as __________ a) Effective size and effective diameter b) Uniform diameter c) All of the mentioned d) None of the mentioned

3 - Question

3. The shape of particle size curve, which is represented by the coefficient of curvature (Cc) is given by __________ a) Cc = (D30)2/D10×D40 b) Cc = (D40)2/D10×D30 c) Cc = (D30)2/D10×D60 d) Cc = D60/D10

4 - Question

4. The coefficient of uniformity (CV) is the ratio of _________ a) D60 and D10 b) D30 and D10 c) D10 and D30 d) D10 and D30
View Answer Answer: a Explanation: The coefficient of uniformity CV, is defined as the ratio of D60 and D10 i.e.CV = D60/ D10.

5 - Question

5. The curve situated at the right side of the particle size distribution curve is _________ a) Coarse-grained soil b) Fine-grained soil c) coarse-grained soil d) None of the mentioned
View Answer Answer: a Explanation: The right side the particle size distribution curve shows the coarse-grained while the left shows the relatively fine-grained soil.

6 - Question

6. What is the time of settlement of coarse particle of a soil sample, of diameter 0.5? Take γ=0.905D2 and height of water tank as 5 m. a) 11.6 seconds b) 72.8 seconds c) 14 seconds d) 22.1 seconds

7 - Question

7. A curve with a flat portion, in particle size distribution curve represent __________ a) Intermediate size particle are missing b) Intermediate size particles are present c) Smaller size particle are present d) Large size particles are present

8 - Question

8. The D10 represents a size, such that _________ of the particles are finer than this size. a) 20% b) 60% c) 10% d) 100%
View Answer Answer: c Explanation: The D10 represents a size, in mm such that 10% of the particle is finer than D10 size.

9 - Question

9. The time of settlement of the finest particle of soil sample is 15hr20min49sec. calculate the height of the water tank. Take D=0.01 mm, γ=0.905D2. a) 5 m b) 7 m c) 12 m d) 4 m

10 - Question

10. The shape of the particle size curve is represented by _________ a) Effective size b) Effective diameter c) Uniform coefficient d) Co-efficient of curvature
View Answer Answer: d Explanation: Coefficient of the curvature Cc represent the shape of the particle size curve given by CC = (D40)2/D10×D30.

11 - Question

11. A particle-size distribution curve gives us an idea about __________ a) Type of soil b) Properties of soil c) All of the mentioned d) None of the mentioned