19. ( 20. ( ) What does unit weight mean? (A) Weight per unit volume (B) Mass per unit volume (C) Volume per unit weight (D) Volume per unit mass (E) Any of the above (F) None of the above (G) All of the above ) The density of soil particles and the density of soil mass mean the same thing. Is this statement true or false? (A) True (B) False (C) Some time it is true, but other time it may not be true. (D) It depends the situation. It varies from time to time. (E) None of the above 21. ( ) What does specific gravity mean? 22. ( 23. ( (A) The ratio between the unit weight (or density) of a material and the unit weight (or density) of water at 4 degrees Celsius. (B) The ratio between the unit weight (or density) of water at 4 degrees Celsius and the unit weight (or density) of a material. (C) None of the above (D) All of the above ) Among absolute specific gravity, apparent specific gravity, and bulk specific gravity measured for the solids of a certain soil, which does have the greatest quantity measured? (A) Absolute specific gravity (B) Apparent specific gravity (C) Bulk specific gravity (D) Any of the above (E) None of the above ) Which kind of the structure of clay soils is most likely to be for the clay soils found on the bottom of the Lake of Michigan? (A) Dispersed (B) Flocculated (C) Any of the above (D) None of the above (E) All of the above