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Building Materials - Section 3 Multiple Questions and Answers.
| 26. | The normal curing period for lime mortar, is: | ||
| A. | one day | ||
| B. | 3 days | ||
| C. | 7 days | ||
| D. | 10 days | ||
| 27. | The type of steel used for precision levelling staff, is | ||
| A. | Titanium steel | ||
| B. | Carbon steel | ||
| C. | Invar | ||
| D. | Stainless steel. | ||
| 28. | During pudding | ||
| A. | molten metal is kept clear of the fuel | ||
| B. | carbon is converted into carbonic acid gas | ||
| C. | silicon forms a slag | ||
| D. | metal is heated by the burning of gases | ||
| 29. | German silver is an alloy of | ||
| A. | zinc, lead and nickel | ||
| B. | silver, gold and lead | ||
| C. | copper, nickel and zinc | ||
| D. | copper, brass and zinc | ||
| 30. | Pick up the incorrect statement from the following: | ||
| A. | Plastics are chemical resistant | ||
| B. | Plastics are durable | ||
| C. | Plastics are ductile | ||
| D. | Plastics are excellent electric insulators. | ||
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