Question

The size of sand (fine aggregate) in concrete is not more than
1. 3.75 mm
2. 4.75 mm
3. 2.75 mm
4. 3.00

Answer 1

Correct Answer - Option 2 : 4.75 mm

The soil classification based on grain size (mm):

In the Indian Standard Soil Classification System (ISSCS) or BIS, soils are classified according to their grain size as boulder, cobble, gravel, sand, silt, or clay, as shown below in the tabulated form.

Soil Group	Type of Soil	Sub - Group	Size Range
Very Coarse Soils	Boulder		> 300 mm
	Cobble		80 – 300 mm
Coarse Soils	Gravel	Coarse	20 – 80 mm
		Fine	4.75 – 20 mm
	Sand	Coarse	2- 4.75 mm
		Medium	0.425- 2 mm
		Fine	0.075 – 0.425 mm
Fine Soils	Silt		0.002 – 0.075 mm
	Clay		< 0.002 mm

Hence, sand is falling in the range of (0.075-4.75) mm. So option B is the right answer.