Building Materials, Third Edition

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5. The example of glass maker ’s soap is
   (a) nickel oxide (b) cobalt oxide
   (c) manganese dioxide (d) cullets


6. Crown glass is an example of
   (a) soda-lime glass (b) lead glass
   (c) boro-silicate glass (d) sheet glass


7. Which of the following glass is most suitable to withstand high temperatures?
   (a) soda-lime glass (b) lead glass
   (c) boro-silicate glass (d) tempered glass


8. The metal oxide used to make emerald green glass is
   (a) MnO 2 (b) Cr 2 O 7
   (c) cobalt oxide (d) iron oxide

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1. (c) 2. (d) 3. (b) 4. (a) 5. (c) 6. (a) 7. (c) 8. (b)