dissolved organic substances
dissolved solids and dissolved gases
floating solids and dissolved inorganic solids
bacteria and colloidal solids
50 to 60
100 to 150
500 to 600
1400 to 1500
0.25 to 0.35 mm
0.35 to 0.60 mm
0.60 to 1.00 mm
1.00 to 1.80 mm
(i) and (ii)
(ii) and (iii)
(i) and (iv)
(ii) and (iv)
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.