Question

The Lacey's silt factor for a particular alluvium is 2.0. This alluvium would comprise

• A. Medium sand of size 0.5 mm
• B. Coarse sand of size 0.75 mm
• C. Medium bajri of size 1.3 mm
• D. Coarse bajri of size 2.4mm

Answer 1

The correct option is C Medium bajri of size 1.3 mm

Lacey's still factor

$f=1.76\sqrt{d_m}$

$\therefore d_m={\left(\frac{f}{1.76}\right)}^2=1.3$