5-9. What is the main purpose of the 3/4-inch  holes  in  perforated  gypsum lath? 1. To  allow  for  easy  installation 2. To allow for expansion of the mortar 3. To  provide  ventilation  for interior  walls 4. To provide a mechanical key for the mortar 5-10. What type of lath is considered the most versatile? 1. Metal 2. Gypsum 3. Wood 4. Insulation 5-11. What length of blued gypsum lath nail  is  recommended  for  installing 1/2-inch  gypsum  lath? 1. 1 in. 2. 1  1/8  in. 3. 1 3/16 in. 4. 1  1/4  in. 5-12. What is the minimum end lap for wire lath? 1. 1 in. 2. 2 in. 3. 3 in. 4. 2 1/2 in. 5-13. What is the purpose of a casing bead? 1. To reinforce the lath and inside  corners 2. To reinforce the door and window  casings 3. To  provide  room  for  expansion between  plaster  edges  and  the edges  of  baseboards 4. To provide a finished edge around  openings 5-14. To  minimize  shrinking  and  cracking around the upper corners of doors and  windows,  you  should  install which of the following items? 1. Plaster  grounds 2. Expanded  metal  lath  strips 3. Base  screeds 4. Casings  beads 5-15. Which  of  the  following  components serve  as  temporary  guides  around window and door openings and are removed after the plaster has set? 1. Cornerites 2. Corner  beads 3. Plaster  grounds 4. Lath strips 5-16. What is the recommended type and proportions  for  two-coat  plaster used on a masonry or concrete base? 1. Gypsum  plaster  1:2.5 2. Lime plaster using lime putty 1:3.5 3. Portland  cement  1:5 4. Lime plaster using hydrate lime 1:7.5 5-17. You should not apply a lime finish to which of the following base coats? 1. Gypsum 2. Portland cement 3. Gypsum-vermiculite 4. Lime 5-18. When mortar materials are mixed by hand, what is the maximum time that mixing  should  continue  after  all the  materials  have  been  blended? 1. 5 min 2. 10 min 3. 15 min 4. 20 min 27