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Building Materials - Section 6 Multiple Questions and Answers.
| 16. | Good quality cement contains higher percentage of | ||
| A. | Tricalcium silicate | ||
| B. | Di-calcium silicate | ||
| C. | Tri-calcium aluminate | ||
| D. | Tetra calcium alumino ferrite | ||
| 17. | The PVC doors and windows are preferred as they are | ||
| A. | rust proof | ||
| B. | rot proof | ||
| C. | termile proof | ||
| D. | All of these. | ||
| 18. | Based on its dry weight, a freshly felled tree may contain water | ||
| A. | 25% | ||
| B. | 50% | ||
| C. | 75% | ||
| D. | 100%. | ||
| 19. | Forge pig may be converted to wrought iron by | ||
| A. | rolling | ||
| B. | pudding | ||
| C. | shingling | ||
| D. | refining. | ||
| 20. | To give a brilliant finish, the type of varnish used, is | ||
| A. | water varnish | ||
| B. | spirit varnish | ||
| C. | turpentine varnish | ||
| D. | oil varnish | ||
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