Question

Particles of soil in descending order of grain size is
(A) Gravel – Sand – Silt – Clay (B) Gravel – Sand – Clay – Silt
(C) Sand – Gravel – Clay – Silt (D) Clay – Gravel – Sand – Silt

Answer 1

I think it's (a) gravel-sand-silt-clay

Answer 2

The correct order of grain size in descending order is

(A) Gravel – Sand – Silt – Clay

In the Indian Standard Soil Classification System (ISSCS), soils are classified into groups according to size. The size of the following particles are given below in mm:

1) Gravel : 4.75 - 80 mm

2) Sand : 0.075 - 4.75 mm

3) Silt : 0.002 - 0.075

4) Clay : less than 0.002 mm

Hence we can see that the correct order of grain size in descending order is

(A) Gravel – Sand – Silt – Clay