Question

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

The question was posed to me in an online interview.

I'm obligated to ask this question of Sieve Analysis in section Index Properties Determination of Geotechnical Engineering I

Answer 1

Right answer is (c) size of aperture in mm

The explanation is: 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.