Which method can be used for separating slightly larger sized impurities like the pieces of dirt, stone, and husk from wheat, rice or pulses? 

Method of handpicking can be used for separating slightly larger sized impurities like the pieces of dirt, stone, and husk from wheat, rice or pulses . The quantity of such impurities is usually not very large. In such situations, we find that handpicking is a convenient method of separating substances.