Question

Based on HRB classification system, the soil are divided in to ___________

(a) 2 primary groups

(b) 6 primary groups

(c) 7 primary groups

(d) 6 primary groups

The question was posed to me in an online interview.

Question is from Soils in portion Classification of Soils of Geotechnical Engineering I

Answer 1

Right option is (c) 7 primary groups

For explanation: Based on HRB system, the soil is divided into 7 primary groups, designated as A-1, A-2…A-7.