Copyright Goodheart-Willcox Co., Inc. Unit 7 Construction Materials—Types and Uses 133 _____ 17. What are the he two basic kinds of metal? A. Ferrous and nonferrous n B. Steel and copper r C. Steel and aluminum m D. Brittle and malleable 18. 1 8 What shape does each of the following wi n designations d for structural steel indicate? a te A. W W B. S C. C D. L A. _____________________________________ _ B. _____________________________________ _ C. _____________________________________ _ D. _____________________________________ _ _____ 19. What causes concrete to harden? n A. Dehydration B. Evaporation E C. Consolidation on D. Hydration a ti 20. 2 0 What is the system used to measure the h e thickness th of sheet metal products? ______ __ ________________________________ _____ 21. True or o r False? A sheet metal product made from 12-gage 2- g metal weighs more than the same product du made from 6-gage metal. _____ 22. True or False? Loose-fill L o insulation is an fi insulating material ia available in blanket and batt form. _____ 23. Which of the following g is i a benefit of green fi building? A. Reducing solid and material ri a waste B. Improving employee productivity ti v and job satisfaction C. C Improving air and water quality D. All A of the above. _____ 24. True or r False? Thermally efficient, argon- fi filled window i nd units have low R-values. fi _____ 25. True or False? e? Storm water can be collected from a roof and d used for garden irrigation or toilet fl ushing. fl