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Building Materials - Section 6 Multiple Questions and Answers.
| 21. | The softest rock is | ||
| A. | marble | ||
| B. | diamond | ||
| C. | talc | ||
| D. | quartz. | ||
| 22. | Bitumen may be dissolved in | ||
| A. | carbondioxide | ||
| B. | water | ||
| C. | sodium chloride | ||
| D. | carbon disulphide | ||
| 24. | Whitworth compressed steel is obtained when molten steel is subjected to a pressure of | ||
| A. | 5 kg/mm2 | ||
| B. | 9 kg/mm2 | ||
| C. | 13 kg/mm2 | ||
| D. | 15 kg/mm2 | ||
| 25. | Asbestos | ||
| A. | is an excellant insulator for heat and electricity | ||
| B. | is fire-proof and acid proof | ||
| C. | has sp. gravity equal to 3.10 | ||
| D. | All the above. | ||
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