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Building Materials - Section 5 Multiple Questions and Answers.
| 26. | The steel used in R.C.C. work is | ||
| A. | stainless steel | ||
| B. | mild steel | ||
| C. | high carbon steel | ||
| D. | wrought iron. | ||
| 27. | Mastic asphalt is | ||
| A. | water proof | ||
| B. | fire proof | ||
| C. | elastic | ||
| D. | all the above. | ||
| 28. | Non acid-resistant asbestos is : | ||
| A. | tremolite asbestos | ||
| B. | chrysolite abestos | ||
| C. | amosite absestos | ||
| D. | none of these. | ||
| 29. | Stones used for the construction of retaining walls must be | ||
| A. | soft | ||
| B. | hard | ||
| C. | light | ||
| D. | heavy. | ||
| 30. | Permanent magnets are made of high carbon steel and | ||
| A. | 15% of cobalt | ||
| B. | 20% of cobalt | ||
| C. | 35% of cobalt | ||
| D. | 45% of cobalt. | ||
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