6-51. Which of the following requirements for  concrete  blocks  measures  the ability to carry loads and withstand structural  stresses? 1. Absorption 2. Moisture  content 3. Density 4. Compressive strength 6-52. What is the actual size, in inches, of an 8- by 8- by 16-inch CMU? 1. 7 l/2 by 7 1/2 by 15 1/2 2. 7 5/8 by 7 5/8 by 15 5/8 3. 8 by 8 by 16 4. 8 1/4 by 8 1/4 by 16 1/4 6-53. In  concrete  masonry  construction, what part of the block is the face shell? 1. Material that forms the partitions between the cores 2. Holes between the webs 3. Long sides of the block unit 4. Recessed end of the block units 6-54. To minimize cutting and fitting, you should maximize modular planning by the use of which of the following size of block units? 1. Full-size units only 2. Half-size units only 3. Full-size  and  quarter-size  units 4. Full-size  and  half-size  units 6-55. Which of the following parts is best described as the solid side of a building  tile? 1. Shell 2. Web 3. Cell 4. Core 6-56. In addition to the thickness of the shell and webs of tile, the compressive  strength  of  tile  depends upon  which  of  the  following  factors? 1. Materials used and method of manufacture 2. The opening and cell size 3. Its  resistance  to  abrasion 4. Its  resistance  to  deterioration 6-57. When building tiles are used in construction  that  is  exposed  to  the weather,    mortar should be prepared only from which of the following materials? 1. Waterproofed cement 2. Portland   cement-lime 3. Masonry cement 4. Both 2 and 3 above 6-58. The use of structural load-bearing tile is restricted by which of the following  factors? 1. Fire rating of the tiles 2. Weight and sizes of the tiles 3. Availability of the material 4. Building codes and specifications 6-59. Which of the following stone masonry descriptions best describes the term “rubble”? 1. The faces of stone are square and placed in position so the finished  surfaces  will  present  a continuous plane surface appearance 2. The stones used are left in their natural state without any kind of shaping 3. The stones are unprocessed and laid  in  courses  without consideration  of  size  or  weight 4. The stones are roughly squared and laid in such a manner to produce approximately continuous horizontal bed joints 6-60. Of the following types of stonework, which one is considered to be the crudest? 1. Coursed  ashlar 2. Coursed  rubble 3. Random ashlar 4. Random  rubble 6-61. Which,    if any, of the following materials is used in mortar mix to prevent staining of the stones? 1. Ordinary portland cement 2. White portland cement 3. Lime added to the mixed cement 4. None of the above 6-62. What  standard  dimensions,  in  inches, are  of  building  brick? 1. 1 1/4 by 3 3/4 by 8 2. 1 1/2 by 3 3/4 by 8 3. 1 3/4 by 3 3/4 by 8 4. 2 1/4 by 3 3/4 by 8 6-63. Common  brick  is  best  described  as 1. unglazed, uniform in color, and made from select clay 2. unglazed,   variable in color, and made from inferior clay 3. unglazed,    variable in color, and made from pit-run clay 4. glazed, uniform in color, and made from select clay 41