# Soil Mechanics Questions and Answers – Sieve Analysis

This set of Soil Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Sieve Analysis”.

1. Sieve analysis is meant for______
a) coarse-grained soils
b) fine-grained soils
c) coarse-grained gravel
d) silt

Explanation: Sieve analysis is first stage of particle size analysis which is meant for coarse-grained soils only, while the second stage is the sedimentation analysis which is performed for fine-grained soils.

2. In Indian Standard (IS : 460-11962) the sieve sizes are given by_____
a) number of openings
b) number of openings per inch
c) size of aperture in mm
d) size of aperture in cm

Explanation: In the BS and ASTM standards, the sieve sizes are given in terms of number of openings per inch. In Indian Standard, the sieves are designed by the size of aperture in mm.

3. The portion retained on______ IS sieve is termed as gravel fraction.
a) 4.75mm
b) 2mm
c) 425micron
d) 75micron

Explanation: The portion retained on 4.75mm sieve is kept for coarse analysis, hence termed as gravel fraction. While the portion passing through 4.75mm sieve is subjected to fine sieve analysis.

4. The receiver at the bottom of the assembly in sieve shaking machine is________
a) 4.75mm sieve
b) 425micron
c) pan
d) 75micron

Explanation: A pan is kept at the bottom of the whole assembly to collect the finest particles of the soil sample that is used in the experiment.

5. Sieving is performed by arranging the various sieves one over the other in the order of their mech openings.
a) True
b) False

Explanation: The largest aperture sieve being kept at the top and the smallest aperture sieve is at the bottom of the assembly filled on a sieve shaking machine.

6. ______ minutes of shaking is done for soil with small particles.
a) 2
b) 10
c) 15
d) 60

Explanation: The amount of shaking depends upon the shape and number of particles. At least 10 minutes of shaking is desirable for soil particles.

7. The percentage of soil retained on each sieve is calculated on the basis of ______
a) total mass
b) total weight
c) volume of sample
d) density of soil

Explanation: The portion of the soil sample retained on each sieve is weighed and the percentage of soil retained in each sieve is calculated. Mass is measured in terms of mass, and weight in terms of Newton.

8. The soil portion passing through 4.75 mm sieve is washed for further sieve analysis.
a) True
b) False

Explanation: It is advisable to wash the soil portion passing through 4.75 mm sieve so that silt and cay particles sticking to the sand particles may be dislodged.

9. ______ is used for washing the soil portion passing through 4.75 mm sieve.
a) distilled water
b) 2g of sodium hexametaphosphate per litre of water
c) 10% of brine solution
d) kerosene

Explanation: Sodium hexametaphosphate acts as a dispersing agent that prevents flocculation or the combining of suspended matter into aggregates that settle due to gravity.

Sanfoundry Global Education & Learning Series – Soil Mechanics.

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