Geotechnical Engineering Questions and Answers – Particle Size Distribution Curve

Geotechnical Engineering Objective Questions


Geotechnical Engineering Objective Questions

This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Particle Size Distrubution Curve”.

1. A soil sample may be well graded if __________




Answer is C)
Explanation: A soil is said to be well graded when it has a good representation of particle of all size.


2. For coarse grained soil, the particle size D10 is sometimes called as __________




Answer is A)
Explanation: The size D10 is sometimes called as the effective size or effective diameter.


3. The shape of particle size curve, which is represented by the coefficient of curvature (Cc) is given by __________




Answer is C)
Explanation: The coefficient of curvature (Cc) is given by the equation Cc = (D30)2/D10×D60.


4. The coefficient of uniformity (CV) is the ratio of _________




Answer is A)
Explanation: The coefficient of uniformity CV, is defined as the ratio of D60 and D10 i.e.CV = D60/ D10.


5. The curve situated at the right side of the particle size distribution curve is _________




Answer is A)
Explanation: The right side the particle size distribution curve shows the coarse-grained while the left shows the relatively fine-grained soil.


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.




Answer is D)
Explanation: γ=0.905(0.5)2=0.2263 m/sec Time of settlement, T=h/v =5/0.2263=22.1 seconds.


7. A curve with a flat portion, in particle size distribution curve represent __________




Answer is A)
Explanation: A curve with a flat portion represents oil in which intermediate size particle are missing.


8. 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.




Answer is A)
Explanation: γ=0.905(0.01) γ=9.05×10-5 t = 15hr 20min 49sec =55429 sec t=h/v 55429=h/9.05×10-5 h=55429×9.05×10-5 h = 5.000034 m.


9. The shape of the particle size curve is represented by _________




Answer is D)
Explanation: Coefficient of the curvature Cc represent the shape of the particle size curve given by CC = (D40)2/D10×D30.


10. A particle-size distribution curve gives us an idea about __________




Answer is A)
Explanation: A particle-size curve shows both type and gradation of the soil.

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