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| Q. |
For 2nd class building rain water pipes shall be of finished painted. |
| A. | cast iron |
| B. | bog iron |
| C. | brown ore |
| D. | pyrite |
| Answer» A. cast iron | |
| Explanation: cast iron is a group of iron- carbon alloys with a carbon content greater than 2%.[1] its usefulness derives from its relatively low melting temperature. the alloy constituents affect its colour when fractured: white cast iron has carbide impurities which allow cracks to pass straight through, grey cast iron has graphite flakes which deflect a passing crack and initiate countless new cracks as the material breaks, and ductile cast iron has spherical graphite “nodules” which stop the crack from further progressing. | |
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