Question

To use a sieve to separate sand and rice seeds '', what should be the size of the holes of the sieve in comprasion to the size in comprasion to the size of sand particles and rice seeds

Answer 1

It is according the size of seed or sand particle to be seived which isn't mentioned in your question dear....

Answer 2

The aggregate should be oven-dried at high temperature before sieving to prevent lump formation of the fine particles due to moisture content, which might clog the fine sieve holes.